关于activity继承的抽象类Context（基类）
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Activity---ContextThemeWrapper------ContextWrapper---------Context
其他的两个先不看，先看最后一个context，简单理解为环境，上下文对象，最上面是定义了一些十六进制的static final （关于为什么定义为static final，简单说一下）
来看谷歌的源代码
/** * File creation mode: the default mode, where the created file can only * be accessed by the calling application (or all applications sharing the * same user ID). * @see #MODE_WORLD_READABLE * @see #MODE_WORLD_WRITEABLE */ public static final int MODE_PRIVATE = 0x0000; /** * @deprecated Creating world-readable files is very dangerous, and likely * to cause security holes in applications. It is strongly discouraged; * instead, applications should use more formal mechanism for interactions * such as {@link ContentProvider}, {@link BroadcastReceiver}, and * {@link android.app.Service}. There are no guarantees that this * access mode will remain on a file, such as when it goes through a * backup and restore. * File creation mode: allow all other applications to have read access * to the created file. * @see #MODE_PRIVATE * @see #MODE_WORLD_WRITEABLE */ @Deprecated public static final int MODE_WORLD_READABLE = 0x0001; /** * @deprecated Creating world-writable files is very dangerous, and likely * to cause security holes in applications. It is strongly discouraged; * instead, applications should use more formal mechanism for interactions * such as {@link ContentProvider}, {@link BroadcastReceiver}, and * {@link android.app.Service}. There are no guarantees that this * access mode will remain on a file, such as when it goes through a * backup and restore. * File creation mode: allow all other applications to have write access * to the created file. * @see #MODE_PRIVATE * @see #MODE_WORLD_READABLE */ @Deprecated public static final int MODE_WORLD_WRITEABLE = 0x0002; /** * File creation mode: for use with {@link #openFileOutput}, if the file * already exists then write data to the end of the existing file * instead of erasing it. * @see #openFileOutput */ public static final int MODE_APPEND = 0x8000; /** * SharedPreference loading flag: when set, the file on disk will * be checked for modification even if the shared preferences * instance is already loaded in this process. This behavior is * sometimes desired in cases where the application has multiple * processes, all writing to the same SharedPreferences file. * Generally there are better forms of communication between * processes, though. * * <p>This was the legacy (but undocumented) behavior in and * before Gingerbread (Android 2.3) and this flag is implied when * targetting such releases. For applications targetting SDK * versions <em>greater than</em> Android 2.3, this flag must be * explicitly set if desired. * * @see #getSharedPreferences */ public static final int MODE_MULTI_PROCESS = 0x0004; /** * Database open flag: when set, the database is opened with write-ahead * logging enabled by default. * * @see #openOrCreateDatabase(String, int, CursorFactory) * @see #openOrCreateDatabase(String, int, CursorFactory, DatabaseErrorHandler) * @see SQLiteDatabase#enableWriteAheadLogging */ public static final int MODE_ENABLE_WRITE_AHEAD_LOGGING = 0x0008; /** @hide */ @IntDef(flag = true, value = { BIND_AUTO_CREATE, BIND_AUTO_CREATE, BIND_DEBUG_UNBIND, BIND_NOT_FOREGROUND, BIND_ABOVE_CLIENT, BIND_ALLOW_OOM_MANAGEMENT, BIND_WAIVE_PRIORITY }) @Retention(RetentionPolicy.SOURCE) public @interface BindServiceFlags {} /** * Flag for {@link #bindService}: automatically create the service as long * as the binding exists. Note that while this will create the service, * its {@link android.app.Service#onStartCommand} * method will still only be called due to an * explicit call to {@link #startService}. Even without that, though, * this still provides you with access to the service object while the * service is created. * * <p>Note that prior to {@link android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH}, * not supplying this flag would also impact how important the system * consider's the target service's process to be. When set, the only way * for it to be raised was by binding from a service in which case it will * only be important when that activity is in the foreground. Now to * achieve this behavior you must explicitly supply the new flag * {@link #BIND_ADJUST_WITH_ACTIVITY}. For compatibility, old applications * that don't specify {@link #BIND_AUTO_CREATE} will automatically have * the flags {@link #BIND_WAIVE_PRIORITY} and * {@link #BIND_ADJUST_WITH_ACTIVITY} set for them in order to achieve * the same result. */ public static final int BIND_AUTO_CREATE = 0x0001; /** * Flag for {@link #bindService}: include debugging help for mismatched * calls to unbind. When this flag is set, the callstack of the following * {@link #unbindService} call is retained, to be printed if a later * incorrect unbind call is made. Note that doing this requires retaining * information about the binding that was made for the lifetime of the app, * resulting in a leak -- this should only be used for debugging. */ public static final int BIND_DEBUG_UNBIND = 0x0002; /** * Flag for {@link #bindService}: don't allow this binding to raise * the target service's process to the foreground scheduling priority. * It will still be raised to at least the same memory priority * as the client (so that its process will not be killable in any * situation where the client is not killable), but for CPU scheduling * purposes it may be left in the background. This only has an impact * in the situation where the binding client is a foreground process * and the target service is in a background process. */ public static final int BIND_NOT_FOREGROUND = 0x0004; /** * Flag for {@link #bindService}: indicates that the client application * binding to this service considers the service to be more important than * the app itself. When set, the platform will try to have the out of * memory killer kill the app before it kills the service it is bound to, though * this is not guaranteed to be the case. */ public static final int BIND_ABOVE_CLIENT = 0x0008; /** * Flag for {@link #bindService}: allow the process hosting the bound * service to go through its normal memory management. It will be * treated more like a running service, allowing the system to * (temporarily) expunge the process if low on memory or for some other * whim it may have, and being more aggressive about making it a candidate * to be killed (and restarted) if running for a long time. */ public static final int BIND_ALLOW_OOM_MANAGEMENT = 0x0010; /** * Flag for {@link #bindService}: don't impact the scheduling or * memory management priority of the target service's hosting process. * Allows the service's process to be managed on the background LRU list * just like a regular application process in the background. */ public static final int BIND_WAIVE_PRIORITY = 0x0020; /** * Flag for {@link #bindService}: this service is very important to * the client, so should be brought to the foreground process level * when the client is. Normally a process can only be raised to the * visibility level by a client, even if that client is in the foreground. */ public static final int BIND_IMPORTANT = 0x0040; /** * Flag for {@link #bindService}: If binding from an activity, allow the * target service's process importance to be raised based on whether the * activity is visible to the user, regardless whether another flag is * used to reduce the amount that the client process's overall importance * is used to impact it. */ public static final int BIND_ADJUST_WITH_ACTIVITY = 0x0080; /** * @hide Flag for {@link #bindService}: Treat the binding as hosting * an activity, an unbinding as the activity going in the background. * That is, when unbinding, the process when empty will go on the activity * LRU list instead of the regular one, keeping it around more aggressively * than it otherwise would be. This is intended for use with IMEs to try * to keep IME processes around for faster keyboard switching. */ public static final int BIND_TREAT_LIKE_ACTIVITY = 0x08000000; /** * @hide An idea that is not yet implemented. * Flag for {@link #bindService}: If binding from an activity, consider * this service to be visible like the binding activity is. That is, * it will be treated as something more important to keep around than * invisible background activities. This will impact the number of * recent activities the user can switch between without having them * restart. There is no guarantee this will be respected, as the system * tries to balance such requests from one app vs. the importantance of * keeping other apps around. */ public static final int BIND_VISIBLE = 0x10000000; /** * @hide * Flag for {@link #bindService}: Consider this binding to be causing the target * process to be showing UI, so it will be do a UI_HIDDEN memory trim when it goes * away. */ public static final int BIND_SHOWING_UI = 0x20000000; /** * Flag for {@link #bindService}: Don't consider the bound service to be * visible, even if the caller is visible. * @hide */ public static final int BIND_NOT_VISIBLE = 0x40000000;
大家应该发现了，谷歌定义的都是public，而不是protected或者default，这就是说让其它不是activity的可以引用，而final则是定义常量，不能改变，static则是定义的时候为其分配一块内存区间，一直到引用结束，还有int，应该是2亿，统计人口啥的足够用了，感觉android里面的需要谷歌自己定义的应该超不过两亿，所以它选择了int，再来看这个抽象类定义的一些方法
大家应该会疑问，为什么定义一个抽象类，这里引用百度百科的抽象类定义，大家应该就明白了
Java
抽象类的作用是什么：
如果还不理解那么看一下谷歌的源代码
在面向对象方法中，抽象类主要用来进行类型隐藏。构造出一个固定的一组行为的抽象描述，但是这组行为却能够有任意个可能的具体实现方式。这个抽象描述就是抽象类，而这一组任意个可能的具体实现则表现为所有可能的派生类。模块可以操作一个抽象体。由于模块依赖于一个固定的抽象体，因此它可以是不允许修改的；
通过从这个抽象体派生，也可扩展此模块的行为功能。为了能够实现面向对象设计的一个最核心的原则OCP(Open-Closed Principle)，抽象类是其中的关键所在。
抽象类往往用来表征对问题领域进行分析、设计中得出的抽象概念，是对一系列看上去不同，但是本质上相同的具体概念的抽象。
/** Return an AssetManager instance for your application's package. */ public abstract AssetManager getAssets(); /** Return a Resources instance for your application's package. */ public abstract Resources getResources(); /** Return PackageManager instance to find global package information. */ public abstract PackageManager getPackageManager(); /** Return a ContentResolver instance for your application's package. */ public abstract ContentResolver getContentResolver(); /** * Return the Looper for the main thread of the current process. This is * the thread used to dispatch calls to application components (activities, * services, etc). * <p> * By definition, this method returns the same result as would be obtained * by calling {@link Looper#getMainLooper() Looper.getMainLooper()}. * </p> * * @return The main looper. */ public abstract Looper getMainLooper(); /** * Return the context of the single, global Application object of the * current process. This generally should only be used if you need a * Context whose lifecycle is separate from the current context, that is * tied to the lifetime of the process rather than the current component. * * <p>Consider for example how this interacts with * {@link #registerReceiver(BroadcastReceiver, IntentFilter)}: * <ul> * <li> <p>If used from an Activity context, the receiver is being registered * within that activity. This means that you are expected to unregister * before the activity is done being destroyed; in fact if you do not do * so, the framework will clean up your leaked registration as it removes * the activity and log an error. Thus, if you use the Activity context * to register a receiver that is static (global to the process, not * associated with an Activity instance) then that registration will be * removed on you at whatever point the activity you used is destroyed. * <li> <p>If used from the Context returned here, the receiver is being * registered with the global state associated with your application. Thus * it will never be unregistered for you. This is necessary if the receiver * is associated with static data, not a particular component. However * using the ApplicationContext elsewhere can easily lead to serious leaks * if you forget to unregister, unbind, etc. * </ul> */ public abstract Context getApplicationContext();这里面的几个抽象方法大家应该都很熟悉吧，尤其是getApplicationContext（）；public abstract Looper getMainLooper();
这个我不是很理解，以后的文章应该会单独介绍，字面的意思是主线程利用looper进行事件的分发
/** * Add a new {@link ComponentCallbacks} to the base application of the * Context, which will be called at the same times as the ComponentCallbacks * methods of activities and other components are called. Note that you * <em>must</em> be sure to use {@link #unregisterComponentCallbacks} when * appropriate in the future; this will not be removed for you. * * @param callback The interface to call. This can be either a * {@link ComponentCallbacks} or {@link ComponentCallbacks2} interface. */ public void registerComponentCallbacks(ComponentCallbacks callback) { getApplicationContext().registerComponentCallbacks(callback); } /** * Remove a {@link ComponentCallbacks} object that was previously registered * with {@link #registerComponentCallbacks(ComponentCallbacks)}. */ public void unregisterComponentCallbacks(ComponentCallbacks callback) { getApplicationContext().unregisterComponentCallbacks(callback); }这两个是组建注册回掉和注销回掉的两个方法/** * Return a localized, styled CharSequence from the application's package's * default string table. * * @param resId Resource id for the CharSequence text */ public final CharSequence getText(int resId) { return getResources().getText(resId); } /** * Return a localized string from the application's package's * default string table. * * @param resId Resource id for the string */ public final String getString(int resId) { return getResources().getString(resId); } /** * Return a localized formatted string from the application's package's * default string table, substituting the format arguments as defined in * {@link java.util.Formatter} and {@link java.lang.String#format}. * * @param resId Resource id for the format string * @param formatArgs The format arguments that will be used for substitution. */ public final String getString(int resId, Object... formatArgs) { return getResources().getString(resId, formatArgs); } /** * Return a drawable object associated with a particular resource ID and * styled for the current theme. * * @param id The desired resource identifier, as generated by the aapt * tool. This integer encodes the package, type, and resource * entry. The value 0 is an invalid identifier. * @return Drawable An object that can be used to draw this resource. */ public final Drawable getDrawable(int id) { return getResources().getDrawable(id, getTheme()); }这里是获得资源文件的内容，其实如果是写程序的话可以自己进行activity的封装，然后在子activity进行赋值/** * Set the base theme for this context. Note that this should be called * before any views are instantiated in the Context (for example before * calling {@link android.app.Activity#setContentView} or * {@link android.view.LayoutInflater#inflate}). * * @param resid The style resource describing the theme. */ public abstract void setTheme(int resid); /** @hide Needed for some internal implementation... not public because * you can't assume this actually means anything. */ public int getThemeResId() { return 0; } /** * Return the Theme object associated with this Context. */ @ViewDebug.ExportedProperty(deepExport = true) public abstract Resources.Theme getTheme(); /** * Retrieve styled attribute information in this Context's theme. See * {@link Resources.Theme#obtainStyledAttributes(int[])} * for more information. * * @see Resources.Theme#obtainStyledAttributes(int[]) */ public final TypedArray obtainStyledAttributes( int[] attrs) { return getTheme().obtainStyledAttributes(attrs); } /** * Retrieve styled attribute information in this Context's theme. See * {@link Resources.Theme#obtainStyledAttributes(int, int[])} * for more information. * * @see Resources.Theme#obtainStyledAttributes(int, int[]) */ public final TypedArray obtainStyledAttributes( int resid, int[] attrs) throws Resources.NotFoundException { return getTheme().obtainStyledAttributes(resid, attrs); } /** * Retrieve styled attribute information in this Context's theme. See * {@link Resources.Theme#obtainStyledAttributes(AttributeSet, int[], int, int)} * for more information. * * @see Resources.Theme#obtainStyledAttributes(AttributeSet, int[], int, int) */ public final TypedArray obtainStyledAttributes( AttributeSet set, int[] attrs) { return getTheme().obtainStyledAttributes(set, attrs, 0, 0); } /** * Retrieve styled attribute information in this Context's theme. See * {@link Resources.Theme#obtainStyledAttributes(AttributeSet, int[], int, int)} * for more information. * * @see Resources.Theme#obtainStyledAttributes(AttributeSet, int[], int, int) */ public final TypedArray obtainStyledAttributes( AttributeSet set, int[] attrs, int defStyleAttr, int defStyleRes) { return getTheme().obtainStyledAttributes( set, attrs, defStyleAttr, defStyleRes); }
这个api版本是22，这个是获取相应activity的theme
/** * Return a class loader you can use to retrieve classes in this package. */ public abstract ClassLoader getClassLoader(); /** Return the name of this application's package. */ public abstract String getPackageName(); /** @hide Return the name of the base context this context is derived from. */ public abstract String getBasePackageName(); /** @hide Return the package name that should be used for app ops calls from * this context. This is the same as {@link #getBasePackageName()} except in * cases where system components are loaded into other app processes, in which * case this will be the name of the primary package in that process (so that app * ops uid verification will work with the name). */ public abstract String getOpPackageName(); /** Return the full application info for this context's package. */ public abstract ApplicationInfo getApplicationInfo(); /** * Return the full path to this context's primary Android package. * The Android package is a ZIP file which contains the application's * primary resources. * * <p>Note: this is not generally useful for applications, since they should * not be directly accessing the file system. * * @return String Path to the resources. */ public abstract String getPackageResourcePath(); /** * Return the full path to this context's primary Android package. * The Android package is a ZIP file which contains application's * primary code and assets. * * <p>Note: this is not generally useful for applications, since they should * not be directly accessing the file system. * * @return String Path to the code and assets. */ public abstract String getPackageCodePath(); /** * {@hide} * Return the full path to the shared prefs file for the given prefs group name. * * <p>Note: this is not generally useful for applications, since they should * not be directly accessing the file system. */ public abstract File getSharedPrefsFile(String name); /** * Retrieve and hold the contents of the preferences file 'name', returning * a SharedPreferences through which you can retrieve and modify its * values. Only one instance of the SharedPreferences object is returned * to any callers for the same name, meaning they will see each other's * edits as soon as they are made. * * @param name Desired preferences file. If a preferences file by this name * does not exist, it will be created when you retrieve an * editor (SharedPreferences.edit()) and then commit changes (Editor.commit()). * @param mode Operating mode. Use 0 or {@link #MODE_PRIVATE} for the * default operation, {@link #MODE_WORLD_READABLE} * and {@link #MODE_WORLD_WRITEABLE} to control permissions. The bit * {@link #MODE_MULTI_PROCESS} can also be used if multiple processes * are mutating the same SharedPreferences file. {@link #MODE_MULTI_PROCESS} * is always on in apps targeting Gingerbread (Android 2.3) and below, and * off by default in later versions. * * @return The single {@link SharedPreferences} instance that can be used * to retrieve and modify the preference values. * * @see #MODE_PRIVATE * @see #MODE_WORLD_READABLE * @see #MODE_WORLD_WRITEABLE * @see #MODE_MULTI_PROCESS */ public abstract SharedPreferences getSharedPreferences(String name, int mode); /** * Open a private file associated with this Context's application package * for reading. * * @param name The name of the file to open; can not contain path * separators. * * @return The resulting {@link FileInputStream}. * * @see #openFileOutput * @see #fileList * @see #deleteFile * @see java.io.FileInputStream#FileInputStream(String) */ public abstract FileInputStream openFileInput(String name) throws FileNotFoundException; /** * Open a private file associated with this Context's application package * for writing. Creates the file if it doesn't already exist. * * <p>No permissions are required to invoke this method, since it uses internal * storage. * * @param name The name of the file to open; can not contain path * separators. * @param mode Operating mode. Use 0 or {@link #MODE_PRIVATE} for the * default operation, {@link #MODE_APPEND} to append to an existing file, * {@link #MODE_WORLD_READABLE} and {@link #MODE_WORLD_WRITEABLE} to control * permissions. * * @return The resulting {@link FileOutputStream}. * * @see #MODE_APPEND * @see #MODE_PRIVATE * @see #MODE_WORLD_READABLE * @see #MODE_WORLD_WRITEABLE * @see #openFileInput * @see #fileList * @see #deleteFile * @see java.io.FileOutputStream#FileOutputStream(String) */ public abstract FileOutputStream openFileOutput(String name, int mode) throws FileNotFoundException; /** * Delete the given private file associated with this Context's * application package. * * @param name The name of the file to delete; can not contain path * separators. * * @return {@code true} if the file was successfully deleted; else * {@code false}. * * @see #openFileInput * @see #openFileOutput * @see #fileList * @see java.io.File#delete() */ public abstract boolean deleteFile(String name); /** * Returns the absolute path on the filesystem where a file created with * {@link #openFileOutput} is stored. * * @param name The name of the file for which you would like to get * its path. * * @return An absolute path to the given file. * * @see #openFileOutput * @see #getFilesDir * @see #getDir */ public abstract File getFileStreamPath(String name); /** * Returns the absolute path to the directory on the filesystem where * files created with {@link #openFileOutput} are stored. * * <p>No permissions are required to read or write to the returned path, since this * path is internal storage. * * @return The path of the directory holding application files. * * @see #openFileOutput * @see #getFileStreamPath * @see #getDir */ public abstract File getFilesDir(); /** * Returns the absolute path to the directory on the filesystem similar to * {@link #getFilesDir()}. The difference is that files placed under this * directory will be excluded from automatic backup to remote storage. See * {@link android.app.backup.BackupAgent BackupAgent} for a full discussion * of the automatic backup mechanism in Android. * * <p>No permissions are required to read or write to the returned path, since this * path is internal storage. * * @return The path of the directory holding application files that will not be * automatically backed up to remote storage. * * @see #openFileOutput * @see #getFileStreamPath * @see #getDir * @see android.app.backup.BackupAgent */ public abstract File getNoBackupFilesDir(); /** * Returns the absolute path to the directory on the primary external filesystem * (that is somewhere on {@link android.os.Environment#getExternalStorageDirectory() * Environment.getExternalStorageDirectory()}) where the application can * place persistent files it owns. These files are internal to the * applications, and not typically visible to the user as media. * * <p>This is like {@link #getFilesDir()} in that these * files will be deleted when the application is uninstalled, however there * are some important differences: * * <ul> * <li>External files are not always available: they will disappear if the * user mounts the external storage on a computer or removes it. See the * APIs on {@link android.os.Environment} for information in the storage state. * <li>There is no security enforced with these files. For example, any application * holding {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE} can write to * these files. * </ul> * * <p>Starting in {@link android.os.Build.VERSION_CODES#KITKAT}, no permissions * are required to read or write to the returned path; it's always * accessible to the calling app. This only applies to paths generated for * package name of the calling application. To access paths belonging * to other packages, {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE} * and/or {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} are required. * * <p>On devices with multiple users (as described by {@link UserManager}), * each user has their own isolated external storage. Applications only * have access to the external storage for the user they're running as.</p> * * <p>Here is an example of typical code to manipulate a file in * an application's private storage:</p> * * {@sample development/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.java * private_file} * * <p>If you supply a non-null <var>type</var> to this function, the returned * file will be a path to a sub-directory of the given type. Though these files * are not automatically scanned by the media scanner, you can explicitly * add them to the media database with * {@link android.media.MediaScannerConnection#scanFile(Context, String[], String[], * OnScanCompletedListener) MediaScannerConnection.scanFile}. * Note that this is not the same as * {@link android.os.Environment#getExternalStoragePublicDirectory * Environment.getExternalStoragePublicDirectory()}, which provides * directories of media shared by all applications. The * directories returned here are * owned by the application, and their contents will be removed when the * application is uninstalled. Unlike * {@link android.os.Environment#getExternalStoragePublicDirectory * Environment.getExternalStoragePublicDirectory()}, the directory * returned here will be automatically created for you. * * <p>Here is an example of typical code to manipulate a picture in * an application's private storage and add it to the media database:</p> * * {@sample development/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.java * private_picture} * * @param type The type of files directory to return. May be null for * the root of the files directory or one of * the following Environment constants for a subdirectory: * {@link android.os.Environment#DIRECTORY_MUSIC}, * {@link android.os.Environment#DIRECTORY_PODCASTS}, * {@link android.os.Environment#DIRECTORY_RINGTONES}, * {@link android.os.Environment#DIRECTORY_ALARMS}, * {@link android.os.Environment#DIRECTORY_NOTIFICATIONS}, * {@link android.os.Environment#DIRECTORY_PICTURES}, or * {@link android.os.Environment#DIRECTORY_MOVIES}. * * @return The path of the directory holding application files * on external storage. Returns null if external storage is not currently * mounted so it could not ensure the path exists; you will need to call * this method again when it is available. * * @see #getFilesDir * @see android.os.Environment#getExternalStoragePublicDirectory */ @Nullable public abstract File getExternalFilesDir(@Nullable String type); /** * Returns absolute paths to application-specific directories on all * external storage devices where the application can place persistent files * it owns. These files are internal to the application, and not typically * visible to the user as media. * <p> * This is like {@link #getFilesDir()} in that these files will be deleted when * the application is uninstalled, however there are some important differences: * <ul> * <li>External files are not always available: they will disappear if the * user mounts the external storage on a computer or removes it. * <li>There is no security enforced with these files. * </ul> * <p> * External storage devices returned here are considered a permanent part of * the device, including both emulated external storage and physical media * slots, such as SD cards in a battery compartment. The returned paths do * not include transient devices, such as USB flash drives. * <p> * An application may store data on any or all of the returned devices. For * example, an app may choose to store large files on the device with the * most available space, as measured by {@link StatFs}. * <p> * No permissions are required to read or write to the returned paths; they * are always accessible to the calling app. Write access outside of these * paths on secondary external storage devices is not available. * <p> * The first path returned is the same as {@link #getExternalFilesDir(String)}. * Returned paths may be {@code null} if a storage device is unavailable. * * @see #getExternalFilesDir(String) * @see Environment#getExternalStorageState(File) */ public abstract File[] getExternalFilesDirs(String type); /** * Return the primary external storage directory where this application's OBB * files (if there are any) can be found. Note if the application does not have * any OBB files, this directory may not exist. * <p> * This is like {@link #getFilesDir()} in that these files will be deleted when * the application is uninstalled, however there are some important differences: * <ul> * <li>External files are not always available: they will disappear if the * user mounts the external storage on a computer or removes it. * <li>There is no security enforced with these files. For example, any application * holding {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE} can write to * these files. * </ul> * <p> * Starting in {@link android.os.Build.VERSION_CODES#KITKAT}, no permissions * are required to read or write to the returned path; it's always * accessible to the calling app. This only applies to paths generated for * package name of the calling application. To access paths belonging * to other packages, {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE} * and/or {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} are required. * <p> * On devices with multiple users (as described by {@link UserManager}), * multiple users may share the same OBB storage location. Applications * should ensure that multiple instances running under different users don't * interfere with each other. */ public abstract File getObbDir(); /** * Returns absolute paths to application-specific directories on all * external storage devices where the application's OBB files (if there are * any) can be found. Note if the application does not have any OBB files, * these directories may not exist. * <p> * This is like {@link #getFilesDir()} in that these files will be deleted when * the application is uninstalled, however there are some important differences: * <ul> * <li>External files are not always available: they will disappear if the * user mounts the external storage on a computer or removes it. * <li>There is no security enforced with these files. * </ul> * <p> * External storage devices returned here are considered a permanent part of * the device, including both emulated external storage and physical media * slots, such as SD cards in a battery compartment. The returned paths do * not include transient devices, such as USB flash drives. * <p> * An application may store data on any or all of the returned devices. For * example, an app may choose to store large files on the device with the * most available space, as measured by {@link StatFs}. * <p> * No permissions are required to read or write to the returned paths; they * are always accessible to the calling app. Write access outside of these * paths on secondary external storage devices is not available. * <p> * The first path returned is the same as {@link #getObbDir()}. * Returned paths may be {@code null} if a storage device is unavailable. * * @see #getObbDir() * @see Environment#getExternalStorageState(File) */ public abstract File[] getObbDirs(); /** * Returns the absolute path to the application specific cache directory * on the filesystem. These files will be ones that get deleted first when the * device runs low on storage. * There is no guarantee when these files will be deleted. * * <strong>Note: you should not <em>rely</em> on the system deleting these * files for you; you should always have a reasonable maximum, such as 1 MB, * for the amount of space you consume with cache files, and prune those * files when exceeding that space.</strong> * * @return The path of the directory holding application cache files. * * @see #openFileOutput * @see #getFileStreamPath * @see #getDir */ public abstract File getCacheDir(); /** * Returns the absolute path to the application specific cache directory on * the filesystem designed for storing cached code. The system will delete * any files stored in this location both when your specific application is * upgraded, and when the entire platform is upgraded. * <p> * This location is optimal for storing compiled or optimized code generated * by your application at runtime. * <p> * Apps require no extra permissions to read or write to the returned path, * since this path lives in their private storage. * * @return The path of the directory holding application code cache files. */ public abstract File getCodeCacheDir(); /** * Returns the absolute path to the directory on the primary external filesystem * (that is somewhere on {@link android.os.Environment#getExternalStorageDirectory() * Environment.getExternalStorageDirectory()} where the application can * place cache files it owns. These files are internal to the application, and * not typically visible to the user as media. * * <p>This is like {@link #getCacheDir()} in that these * files will be deleted when the application is uninstalled, however there * are some important differences: * * <ul> * <li>The platform does not always monitor the space available in external * storage, and thus may not automatically delete these files. Currently * the only time files here will be deleted by the platform is when running * on {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1} or later and * {@link android.os.Environment#isExternalStorageEmulated() * Environment.isExternalStorageEmulated()} returns true. Note that you should * be managing the maximum space you will use for these anyway, just like * with {@link #getCacheDir()}. * <li>External files are not always available: they will disappear if the * user mounts the external storage on a computer or removes it. See the * APIs on {@link android.os.Environment} for information in the storage state. * <li>There is no security enforced with these files. For example, any application * holding {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE} can write to * these files. * </ul> * * <p>Starting in {@link android.os.Build.VERSION_CODES#KITKAT}, no permissions * are required to read or write to the returned path; it's always * accessible to the calling app. This only applies to paths generated for * package name of the calling application. To access paths belonging * to other packages, {@link android.Manifest.permission#WRITE_EXTERNAL_STORAGE} * and/or {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} are required. * * <p>On devices with multiple users (as described by {@link UserManager}), * each user has their own isolated external storage. Applications only * have access to the external storage for the user they're running as.</p> * * @return The path of the directory holding application cache files * on external storage. Returns null if external storage is not currently * mounted so it could not ensure the path exists; you will need to call * this method again when it is available. * * @see #getCacheDir */ @Nullable public abstract File getExternalCacheDir(); /** * Returns absolute paths to application-specific directories on all * external storage devices where the application can place cache files it * owns. These files are internal to the application, and not typically * visible to the user as media. * <p> * This is like {@link #getCacheDir()} in that these files will be deleted when * the application is uninstalled, however there are some important differences: * <ul> * <li>External files are not always available: they will disappear if the * user mounts the external storage on a computer or removes it. * <li>There is no security enforced with these files. * </ul> * <p> * External storage devices returned here are considered a permanent part of * the device, including both emulated external storage and physical media * slots, such as SD cards in a battery compartment. The returned paths do * not include transient devices, such as USB flash drives. * <p> * An application may store data on any or all of the returned devices. For * example, an app may choose to store large files on the device with the * most available space, as measured by {@link StatFs}. * <p> * No permissions are required to read or write to the returned paths; they * are always accessible to the calling app. Write access outside of these * paths on secondary external storage devices is not available. * <p> * The first path returned is the same as {@link #getExternalCacheDir()}. * Returned paths may be {@code null} if a storage device is unavailable. * * @see #getExternalCacheDir() * @see Environment#getExternalStorageState(File) */ public abstract File[] getExternalCacheDirs(); /** * Returns absolute paths to application-specific directories on all * external storage devices where the application can place media files. * These files are scanned and made available to other apps through * {@link MediaStore}. * <p> * This is like {@link #getExternalFilesDirs} in that these files will be * deleted when the application is uninstalled, however there are some * important differences: * <ul> * <li>External files are not always available: they will disappear if the * user mounts the external storage on a computer or removes it. * <li>There is no security enforced with these files. * </ul> * <p> * External storage devices returned here are considered a permanent part of * the device, including both emulated external storage and physical media * slots, such as SD cards in a battery compartment. The returned paths do * not include transient devices, such as USB flash drives. * <p> * An application may store data on any or all of the returned devices. For * example, an app may choose to store large files on the device with the * most available space, as measured by {@link StatFs}. * <p> * No permissions are required to read or write to the returned paths; they * are always accessible to the calling app. Write access outside of these * paths on secondary external storage devices is not available. * <p> * Returned paths may be {@code null} if a storage device is unavailable. * * @see Environment#getExternalStorageState(File) */ public abstract File[] getExternalMediaDirs(); /** * Returns an array of strings naming the private files associated with * this Context's application package. * * @return Array of strings naming the private files. * * @see #openFileInput * @see #openFileOutput * @see #deleteFile */ public abstract String[] fileList(); /** * Retrieve, creating if needed, a new directory in which the application * can place its own custom data files. You can use the returned File * object to create and access files in this directory. Note that files * created through a File object will only be accessible by your own * application; you can only set the mode of the entire directory, not * of individual files. * * @param name Name of the directory to retrieve. This is a directory * that is created as part of your application data. * @param mode Operating mode. Use 0 or {@link #MODE_PRIVATE} for the * default operation, {@link #MODE_WORLD_READABLE} and * {@link #MODE_WORLD_WRITEABLE} to control permissions. * * @return A {@link File} object for the requested directory. The directory * will have been created if it does not already exist. * * @see #openFileOutput(String, int) */ public abstract File getDir(String name, int mode); /** * Open a new private SQLiteDatabase associated with this Context's * application package. Create the database file if it doesn't exist. * * @param name The name (unique in the application package) of the database. * @param mode Operating mode. Use 0 or {@link #MODE_PRIVATE} for the * default operation, {@link #MODE_WORLD_READABLE} * and {@link #MODE_WORLD_WRITEABLE} to control permissions. * Use {@link #MODE_ENABLE_WRITE_AHEAD_LOGGING} to enable write-ahead logging by default. * @param factory An optional factory class that is called to instantiate a * cursor when query is called. * * @return The contents of a newly created database with the given name. * @throws android.database.sqlite.SQLiteException if the database file could not be opened. * * @see #MODE_PRIVATE * @see #MODE_WORLD_READABLE * @see #MODE_WORLD_WRITEABLE * @see #MODE_ENABLE_WRITE_AHEAD_LOGGING * @see #deleteDatabase */ public abstract SQLiteDatabase openOrCreateDatabase(String name, int mode, CursorFactory factory); /** * Open a new private SQLiteDatabase associated with this Context's * application package. Creates the database file if it doesn't exist. * * <p>Accepts input param: a concrete instance of {@link DatabaseErrorHandler} to be * used to handle corruption when sqlite reports database corruption.</p> * * @param name The name (unique in the application package) of the database. * @param mode Operating mode. Use 0 or {@link #MODE_PRIVATE} for the * default operation, {@link #MODE_WORLD_READABLE} * and {@link #MODE_WORLD_WRITEABLE} to control permissions. * Use {@link #MODE_ENABLE_WRITE_AHEAD_LOGGING} to enable write-ahead logging by default. * @param factory An optional factory class that is called to instantiate a * cursor when query is called. * @param errorHandler the {@link DatabaseErrorHandler} to be used when sqlite reports database * corruption. if null, {@link android.database.DefaultDatabaseErrorHandler} is assumed. * @return The contents of a newly created database with the given name. * @throws android.database.sqlite.SQLiteException if the database file could not be opened. * * @see #MODE_PRIVATE * @see #MODE_WORLD_READABLE * @see #MODE_WORLD_WRITEABLE * @see #MODE_ENABLE_WRITE_AHEAD_LOGGING * @see #deleteDatabase */ public abstract SQLiteDatabase openOrCreateDatabase(String name, int mode, CursorFactory factory, @Nullable DatabaseErrorHandler errorHandler); /** * Delete an existing private SQLiteDatabase associated with this Context's * application package. * * @param name The name (unique in the application package) of the * database. * * @return {@code true} if the database was successfully deleted; else {@code false}. * * @see #openOrCreateDatabase */ public abstract boolean deleteDatabase(String name); /** * Returns the absolute path on the filesystem where a database created with * {@link #openOrCreateDatabase} is stored. * * @param name The name of the database for which you would like to get * its path. * * @return An absolute path to the given database. * * @see #openOrCreateDatabase */ public abstract File getDatabasePath(String name); /** * Returns an array of strings naming the private databases associated with * this Context's application package. * * @return Array of strings naming the private databases. * * @see #openOrCreateDatabase * @see #deleteDatabase */ public abstract String[] databaseList(); /** * @deprecated Use {@link android.app.WallpaperManager#getDrawable * WallpaperManager.get()} instead. */ @Deprecated public abstract Drawable getWallpaper(); /** * @deprecated Use {@link android.app.WallpaperManager#peekDrawable * WallpaperManager.peek()} instead. */ @Deprecated public abstract Drawable peekWallpaper(); /** * @deprecated Use {@link android.app.WallpaperManager#getDesiredMinimumWidth() * WallpaperManager.getDesiredMinimumWidth()} instead. */ @Deprecated public abstract int getWallpaperDesiredMinimumWidth(); /** * @deprecated Use {@link android.app.WallpaperManager#getDesiredMinimumHeight() * WallpaperManager.getDesiredMinimumHeight()} instead. */ @Deprecated public abstract int getWallpaperDesiredMinimumHeight(); /** * @deprecated Use {@link android.app.WallpaperManager#setBitmap(Bitmap) * WallpaperManager.set()} instead. * <p>This method requires the caller to hold the permission * {@link android.Manifest.permission#SET_WALLPAPER}. */ @Deprecated public abstract void setWallpaper(Bitmap bitmap) throws IOException; /** * @deprecated Use {@link android.app.WallpaperManager#setStream(InputStream) * WallpaperManager.set()} instead. * <p>This method requires the caller to hold the permission * {@link android.Manifest.permission#SET_WALLPAPER}. */ @Deprecated public abstract void setWallpaper(InputStream data) throws IOException; /** * @deprecated Use {@link android.app.WallpaperManager#clear * WallpaperManager.clear()} instead. * <p>This method requires the caller to hold the permission * {@link android.Manifest.permission#SET_WALLPAPER}. */ @Deprecated public abstract void clearWallpaper() throws IOException; /** * Same as {@link #startActivity(Intent, Bundle)} with no options * specified. * * @param intent The description of the activity to start. * * @throws ActivityNotFoundException * * @see #startActivity(Intent, Bundle) * @see PackageManager#resolveActivity */ public abstract void startActivity(Intent intent); /** * Version of {@link #startActivity(Intent)} that allows you to specify the * user the activity will be started for. This is not available to applications * that are not pre-installed on the system image. Using it requires holding * the INTERACT_ACROSS_USERS_FULL permission. * @param intent The description of the activity to start. * @param user The UserHandle of the user to start this activity for. * @throws ActivityNotFoundException * @hide */ public void startActivityAsUser(Intent intent, UserHandle user) { throw new RuntimeException("Not implemented. Must override in a subclass."); } /** * Launch a new activity. You will not receive any information about when * the activity exits. * * <p>Note that if this method is being called from outside of an * {@link android.app.Activity} Context, then the Intent must include * the {@link Intent#FLAG_ACTIVITY_NEW_TASK} launch flag. This is because, * without being started from an existing Activity, there is no existing * task in which to place the new activity and thus it needs to be placed * in its own separate task. * * <p>This method throws {@link ActivityNotFoundException} * if there was no Activity found to run the given Intent. * * @param intent The description of the activity to start. * @param options Additional options for how the Activity should be started. * May be null if there are no options. See {@link android.app.ActivityOptions} * for how to build the Bundle supplied here; there are no supported definitions * for building it manually. * * @throws ActivityNotFoundException * * @see #startActivity(Intent) * @see PackageManager#resolveActivity */ public abstract void startActivity(Intent intent, @Nullable Bundle options); /** * Version of {@link #startActivity(Intent, Bundle)} that allows you to specify the * user the activity will be started for. This is not available to applications * that are not pre-installed on the system image. Using it requires holding * the INTERACT_ACROSS_USERS_FULL permission. * @param intent The description of the activity to start. * @param options Additional options for how the Activity should be started. * May be null if there are no options. See {@link android.app.ActivityOptions} * for how to build the Bundle supplied here; there are no supported definitions * for building it manually. * @param userId The UserHandle of the user to start this activity for. * @throws ActivityNotFoundException * @hide */ public void startActivityAsUser(Intent intent, @Nullable Bundle options, UserHandle userId) { throw new RuntimeException("Not implemented. Must override in a subclass."); } /** * Same as {@link #startActivities(Intent[], Bundle)} with no options * specified. * * @param intents An array of Intents to be started. * * @throws ActivityNotFoundException * * @see #startActivities(Intent[], Bundle) * @see PackageManager#resolveActivity */ public abstract void startActivities(Intent[] intents); /** * Launch multiple new activities. This is generally the same as calling * {@link #startActivity(Intent)} for the first Intent in the array, * that activity during its creation calling {@link #startActivity(Intent)} * for the second entry, etc. Note that unlike that approach, generally * none of the activities except the last in the array will be created * at this point, but rather will be created when the user first visits * them (due to pressing back from the activity on top). * * <p>This method throws {@link ActivityNotFoundException} * if there was no Activity found for <em>any</em> given Intent. In this * case the state of the activity stack is undefined (some Intents in the * list may be on it, some not), so you probably want to avoid such situations. * * @param intents An array of Intents to be started. * @param options Additional options for how the Activity should be started. * See {@link android.content.Context#startActivity(Intent, Bundle) * Context.startActivity(Intent, Bundle)} for more details. * * @throws ActivityNotFoundException * * @see #startActivities(Intent[]) * @see PackageManager#resolveActivity */ public abstract void startActivities(Intent[] intents, Bundle options); /** * @hide * Launch multiple new activities. This is generally the same as calling * {@link #startActivity(Intent)} for the first Intent in the array, * that activity during its creation calling {@link #startActivity(Intent)} * for the second entry, etc. Note that unlike that approach, generally * none of the activities except the last in the array will be created * at this point, but rather will be created when the user first visits * them (due to pressing back from the activity on top). * * <p>This method throws {@link ActivityNotFoundException} * if there was no Activity found for <em>any</em> given Intent. In this * case the state of the activity stack is undefined (some Intents in the * list may be on it, some not), so you probably want to avoid such situations. * * @param intents An array of Intents to be started. * @param options Additional options for how the Activity should be started. * @param userHandle The user for whom to launch the activities * See {@link android.content.Context#startActivity(Intent, Bundle) * Context.startActivity(Intent, Bundle)} for more details. * * @throws ActivityNotFoundException * * @see #startActivities(Intent[]) * @see PackageManager#resolveActivity */ public void startActivitiesAsUser(Intent[] intents, Bundle options, UserHandle userHandle) { throw new RuntimeException("Not implemented. Must override in a subclass."); } /** * Same as {@link #startIntentSender(IntentSender, Intent, int, int, int, Bundle)} * with no options specified. * * @param intent The IntentSender to launch. * @param fillInIntent If non-null, this will be provided as the * intent parameter to {@link IntentSender#sendIntent}. * @param flagsMask Intent flags in the original IntentSender that you * would like to change. * @param flagsValues Desired values for any bits set in * <var>flagsMask</var> * @param extraFlags Always set to 0. * * @see #startActivity(Intent) * @see #startIntentSender(IntentSender, Intent, int, int, int, Bundle) */ public abstract void startIntentSender(IntentSender intent, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags) throws IntentSender.SendIntentException; /** * Like {@link #startActivity(Intent, Bundle)}, but taking a IntentSender * to start. If the IntentSender is for an activity, that activity will be started * as if you had called the regular {@link #startActivity(Intent)} * here; otherwise, its associated action will be executed (such as * sending a broadcast) as if you had called * {@link IntentSender#sendIntent IntentSender.sendIntent} on it. * * @param intent The IntentSender to launch. * @param fillInIntent If non-null, this will be provided as the * intent parameter to {@link IntentSender#sendIntent}. * @param flagsMask Intent flags in the original IntentSender that you * would like to change. * @param flagsValues Desired values for any bits set in * <var>flagsMask</var> * @param extraFlags Always set to 0. * @param options Additional options for how the Activity should be started. * See {@link android.content.Context#startActivity(Intent, Bundle) * Context.startActivity(Intent, Bundle)} for more details. If options * have also been supplied by the IntentSender, options given here will * override any that conflict with those given by the IntentSender. * * @see #startActivity(Intent, Bundle) * @see #startIntentSender(IntentSender, Intent, int, int, int) */ public abstract void startIntentSender(IntentSender intent, @Nullable Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, Bundle options) throws IntentSender.SendIntentException; /** * Broadcast the given intent to all interested BroadcastReceivers. This * call is asynchronous; it returns immediately, and you will continue * executing while the receivers are run. No results are propagated from * receivers and receivers can not abort the broadcast. If you want * to allow receivers to propagate results or abort the broadcast, you must * send an ordered broadcast using * {@link #sendOrderedBroadcast(Intent, String)}. * * <p>See {@link BroadcastReceiver} for more information on Intent broadcasts. * * @param intent The Intent to broadcast; all receivers matching this * Intent will receive the broadcast. * * @see android.content.BroadcastReceiver * @see #registerReceiver * @see #sendBroadcast(Intent, String) * @see #sendOrderedBroadcast(Intent, String) * @see #sendOrderedBroadcast(Intent, String, BroadcastReceiver, Handler, int, String, Bundle) */ public abstract void sendBroadcast(Intent intent); /** * Broadcast the given intent to all interested BroadcastReceivers, allowing * an optional required permission to be enforced. This * call is asynchronous; it returns immediately, and you will continue * executing while the receivers are run. No results are propagated from * receivers and receivers can not abort the broadcast. If you want * to allow receivers to propagate results or abort the broadcast, you must * send an ordered broadcast using * {@link #sendOrderedBroadcast(Intent, String)}. * * <p>See {@link BroadcastReceiver} for more information on Intent broadcasts. * * @param intent The Intent to broadcast; all receivers matching this * Intent will receive the broadcast. * @param receiverPermission (optional) String naming a permission that * a receiver must hold in order to receive your broadcast. * If null, no permission is required. * * @see android.content.BroadcastReceiver * @see #registerReceiver * @see #sendBroadcast(Intent) * @see #sendOrderedBroadcast(Intent, String) * @see #sendOrderedBroadcast(Intent, String, BroadcastReceiver, Handler, int, String, Bundle) */ public abstract void sendBroadcast(Intent intent, @Nullable String receiverPermission); /** * Like {@link #sendBroadcast(Intent, String)}, but also allows specification * of an associated app op as per {@link android.app.AppOpsManager}. * @hide */ public abstract void sendBroadcast(Intent intent, String receiverPermission, int appOp); /** * Broadcast the given intent to all interested BroadcastReceivers, delivering * them one at a time to allow more preferred receivers to consume the * broadcast before it is delivered to less preferred receivers. This * call is asynchronous; it returns immediately, and you will continue * executing while the receivers are run. * * <p>See {@link BroadcastReceiver} for more information on Intent broadcasts. * * @param intent The Intent to broadcast; all receivers matching this * Intent will receive the broadcast. * @param receiverPermission (optional) String naming a permissions that * a receiver must hold in order to receive your broadcast. * If null, no permission is required. * * @see android.content.BroadcastReceiver * @see #registerReceiver * @see #sendBroadcast(Intent) * @see #sendOrderedBroadcast(Intent, String, BroadcastReceiver, Handler, int, String, Bundle) */ public abstract void sendOrderedBroadcast(Intent intent, @Nullable String receiverPermission); /** * Version of {@link #sendBroadcast(Intent)} that allows you to * receive data back from the broadcast. This is accomplished by * supplying your own BroadcastReceiver when calling, which will be * treated as a final receiver at the end of the broadcast -- its * {@link BroadcastReceiver#onReceive} method will be called with * the result values collected from the other receivers. The broadcast will * be serialized in the same way as calling * {@link #sendOrderedBroadcast(Intent, String)}. * * <p>Like {@link #sendBroadcast(Intent)}, this method is * asynchronous; it will return before * resultReceiver.onReceive() is called. * * <p>See {@link BroadcastReceiver} for more information on Intent broadcasts. * * @param intent The Intent to broadcast; all receivers matching this * Intent will receive the broadcast. * @param receiverPermission String naming a permissions that * a receiver must hold in order to receive your broadcast. * If null, no permission is required. * @param resultReceiver Your own BroadcastReceiver to treat as the final * receiver of the broadcast. * @param scheduler A custom Handler with which to schedule the * resultReceiver callback; if null it will be * scheduled in the Context's main thread. * @param initialCode An initial value for the result code. Often * Activity.RESULT_OK. * @param initialData An initial value for the result data. Often * null. * @param initialExtras An initial value for the result extras. Often * null. * * @see #sendBroadcast(Intent) * @see #sendBroadcast(Intent, String) * @see #sendOrderedBroadcast(Intent, String) * @see android.content.BroadcastReceiver * @see #registerReceiver * @see android.app.Activity#RESULT_OK */ public abstract void sendOrderedBroadcast(@NonNull Intent intent, @Nullable String receiverPermission, BroadcastReceiver resultReceiver, @Nullable Handler scheduler, int initialCode, @Nullable String initialData, @Nullable Bundle initialExtras); /** * Like {@link #sendOrderedBroadcast(Intent, String, BroadcastReceiver, android.os.Handler, * int, String, android.os.Bundle)}, but also allows specification * of an associated app op as per {@link android.app.AppOpsManager}. * @hide */ public abstract void sendOrderedBroadcast(Intent intent, String receiverPermission, int appOp, BroadcastReceiver resultReceiver, Handler scheduler, int initialCode, String initialData, Bundle initialExtras); /** * Version of {@link #sendBroadcast(Intent)} that allows you to specify the * user the broadcast will be sent to. This is not available to applications * that are not pre-installed on the system image. Using it requires holding * the INTERACT_ACROSS_USERS permission. * @param intent The intent to broadcast * @param user UserHandle to send the intent to. * @see #sendBroadcast(Intent) */ public abstract void sendBroadcastAsUser(Intent intent, UserHandle user); /** * Version of {@link #sendBroadcast(Intent, String)} that allows you to specify the * user the broadcast will be sent to. This is not available to applications * that are not pre-installed on the system image. Using it requires holding * the INTERACT_ACROSS_USERS permission. * * @param intent The Intent to broadcast; all receivers matching this * Intent will receive the broadcast. * @param user UserHandle to send the intent to. * @param receiverPermission (optional) String naming a permission that * a receiver must hold in order to receive your broadcast. * If null, no permission is required. * * @see #sendBroadcast(Intent, String) */ public abstract void sendBroadcastAsUser(Intent intent, UserHandle user, @Nullable String receiverPermission); /** * Version of * {@link #sendOrderedBroadcast(Intent, String, BroadcastReceiver, Handler, int, String, Bundle)} * that allows you to specify the * user the broadcast will be sent to. This is not available to applications * that are not pre-installed on the system image. Using it requires holding * the INTERACT_ACROSS_USERS permission. * * <p>See {@link BroadcastReceiver} for more information on Intent broadcasts. * * @param intent The Intent to broadcast; all receivers matching this * Intent will receive the broadcast. * @param user UserHandle to send the intent to. * @param receiverPermission String naming a permissions that * a receiver must hold in order to receive your broadcast. * If null, no permission is required. * @param resultReceiver Your own BroadcastReceiver to treat as the final * receiver of the broadcast. * @param scheduler A custom Handler with which to schedule the * resultReceiver callback; if null it will be * scheduled in the Context's main thread. * @param initialCode An initial value for the result code. Often * Activity.RESULT_OK. * @param initialData An initial value for the result data. Often * null. * @param initialExtras An initial value for the result extras. Often * null. * * @see #sendOrderedBroadcast(Intent, String, BroadcastReceiver, Handler, int, String, Bundle) */ public abstract void sendOrderedBroadcastAsUser(Intent intent, UserHandle user, @Nullable String receiverPermission, BroadcastReceiver resultReceiver, @Nullable Handler scheduler, int initialCode, @Nullable String initialData, @Nullable Bundle initialExtras); /** * Similar to above but takes an appOp as well, to enforce restrictions. * @see #sendOrderedBroadcastAsUser(Intent, UserHandle, String, * BroadcastReceiver, Handler, int, String, Bundle) * @hide */ public abstract void sendOrderedBroadcastAsUser(Intent intent, UserHandle user, @Nullable String receiverPermission, int appOp, BroadcastReceiver resultReceiver, @Nullable Handler scheduler, int initialCode, @Nullable String initialData, @Nullable Bundle initialExtras); /** * <p>Perform a {@link #sendBroadcast(Intent)} that is "sticky," meaning the * Intent you are sending stays around after the broadcast is complete, * so that others can quickly retrieve that data through the return * value of {@link #registerReceiver(BroadcastReceiver, IntentFilter)}. In * all other ways, this behaves the same as * {@link #sendBroadcast(Intent)}. * * <p>You must hold the {@link android.Manifest.permission#BROADCAST_STICKY} * permission in order to use this API. If you do not hold that * permission, {@link SecurityException} will be thrown. * * @deprecated Sticky broadcasts should not be used. They provide no security (anyone * can access them), no protection (anyone can modify them), and many other problems. * The recommended pattern is to use a non-sticky broadcast to report that <em>something</em> * has changed, with another mechanism for apps to retrieve the current value whenever * desired. * * @param intent The Intent to broadcast; all receivers matching this * Intent will receive the broadcast, and the Intent will be held to * be re-broadcast to future receivers. * * @see #sendBroadcast(Intent) * @see #sendStickyOrderedBroadcast(Intent, BroadcastReceiver, Handler, int, String, Bundle) */ @Deprecated public abstract void sendStickyBroadcast(Intent intent); /** * <p>Version of {@link #sendStickyBroadcast} that allows you to * receive data back from the broadcast. This is accomplished by * supplying your own BroadcastReceiver when calling, which will be * treated as a final receiver at the end of the broadcast -- its * {@link BroadcastReceiver#onReceive} method will be called with * the result values collected from the other receivers. The broadcast will * be serialized in the same way as calling * {@link #sendOrderedBroadcast(Intent, String)}. * * <p>Like {@link #sendBroadcast(Intent)}, this method is * asynchronous; it will return before * resultReceiver.onReceive() is called. Note that the sticky data * stored is only the data you initially supply to the broadcast, not * the result of any changes made by the receivers. * * <p>See {@link BroadcastReceiver} for more information on Intent broadcasts. * * @deprecated Sticky broadcasts should not be used. They provide no security (anyone * can access them), no protection (anyone can modify them), and many other problems. * The recommended pattern is to use a non-sticky broadcast to report that <em>something</em> * has changed, with another mechanism for apps to retrieve the current value whenever * desired. * * @param intent The Intent to broadcast; all receivers matching this * Intent will receive the broadcast. * @param resultReceiver Your own BroadcastReceiver to treat as the final * receiver of the broadcast. * @param scheduler A custom Handler with which to schedule the * resultReceiver callback; if null it will be * scheduled in the Context's main thread. * @param initialCode An initial value for the result code. Often * Activity.RESULT_OK. * @param initialData An initial value for the result data. Often * null. * @param initialExtras An initial value for the result extras. Often * null. * * @see #sendBroadcast(Intent) * @see #sendBroadcast(Intent, String) * @see #sendOrderedBroadcast(Intent, String) * @see #sendStickyBroadcast(Intent) * @see android.content.BroadcastReceiver * @see #registerReceiver * @see android.app.Activity#RESULT_OK */ @Deprecated public abstract void sendStickyOrderedBroadcast(Intent intent, BroadcastReceiver resultReceiver, @Nullable Handler scheduler, int initialCode, @Nullable String initialData, @Nullable Bundle initialExtras); /** * <p>Remove the data previously sent with {@link #sendStickyBroadcast}, * so that it is as if the sticky broadcast had never happened. * * <p>You must hold the {@link android.Manifest.permission#BROADCAST_STICKY} * permission in order to use this API. If you do not hold that * permission, {@link SecurityException} will be thrown. * * @deprecated Sticky broadcasts should not be used. They provide no security (anyone * can access them), no protection (anyone can modify them), and many other problems. * The recommended pattern is to use a non-sticky broadcast to report that <em>something</em> * has changed, with another mechanism for apps to retrieve the current value whenever * desired. * * @param intent The Intent that was previously broadcast. * * @see #sendStickyBroadcast */ @Deprecated public abstract void removeStickyBroadcast(Intent intent); /** * <p>Version of {@link #sendStickyBroadcast(Intent)} that allows you to specify the * user the broadcast will be sent to. This is not available to applications * that are not pre-installed on the system image. Using it requires holding * the INTERACT_ACROSS_USERS permission. * * @deprecated Sticky broadcasts should not be used. They provide no security (anyone * can access them), no protection (anyone can modify them), and many other problems. * The recommended pattern is to use a non-sticky broadcast to report that <em>something</em> * has changed, with another mechanism for apps to retrieve the current value whenever * desired. * * @param intent The Intent to broadcast; all receivers matching this * Intent will receive the broadcast, and the Intent will be held to * be re-broadcast to future receivers. * @param user UserHandle to send the intent to. * * @see #sendBroadcast(Intent) */ @Deprecated public abstract void sendStickyBroadcastAsUser(Intent intent, UserHandle user); /** * <p>Version of * {@link #sendStickyOrderedBroadcast(Intent, BroadcastReceiver, Handler, int, String, Bundle)} * that allows you to specify the * user the broadcast will be sent to. This is not available to applications * that are not pre-installed on the system image. Using it requires holding * the INTERACT_ACROSS_USERS permission. * * <p>See {@link BroadcastReceiver} for more information on Intent broadcasts. * * @deprecated Sticky broadcasts should not be used. They provide no security (anyone * can access them), no protection (anyone can modify them), and many other problems. * The recommended pattern is to use a non-sticky broadcast to report that <em>something</em> * has changed, with another mechanism for apps to retrieve the current value whenever * desired. * * @param intent The Intent to broadcast; all receivers matching this * Intent will receive the broadcast. * @param user UserHandle to send the intent to. * @param resultReceiver Your own BroadcastReceiver to treat as the final * receiver of the broadcast. * @param scheduler A custom Handler with which to schedule the * resultReceiver callback; if null it will be * scheduled in the Context's main thread. * @param initialCode An initial value for the result code. Often * Activity.RESULT_OK. * @param initialData An initial value for the result data. Often * null. * @param initialExtras An initial value for the result extras. Often * null. * * @see #sendStickyOrderedBroadcast(Intent, BroadcastReceiver, Handler, int, String, Bundle) */ @Deprecated public abstract void sendStickyOrderedBroadcastAsUser(Intent intent, UserHandle user, BroadcastReceiver resultReceiver, @Nullable Handler scheduler, int initialCode, @Nullable String initialData, @Nullable Bundle initialExtras); /** * <p>Version of {@link #removeStickyBroadcast(Intent)} that allows you to specify the * user the broadcast will be sent to. This is not available to applications * that are not pre-installed on the system image. Using it requires holding * the INTERACT_ACROSS_USERS permission. * * <p>You must hold the {@link android.Manifest.permission#BROADCAST_STICKY} * permission in order to use this API. If you do not hold that * permission, {@link SecurityException} will be thrown. * * @deprecated Sticky broadcasts should not be used. They provide no security (anyone * can access them), no protection (anyone can modify them), and many other problems. * The recommended pattern is to use a non-sticky broadcast to report that <em>something</em> * has changed, with another mechanism for apps to retrieve the current value whenever * desired. * * @param intent The Intent that was previously broadcast. * @param user UserHandle to remove the sticky broadcast from. * * @see #sendStickyBroadcastAsUser */ @Deprecated public abstract void removeStickyBroadcastAsUser(Intent intent, UserHandle user); /** * Register a BroadcastReceiver to be run in the main activity thread. The * <var>receiver</var> will be called with any broadcast Intent that * matches <var>filter</var>, in the main application thread. * * <p>The system may broadcast Intents that are "sticky" -- these stay * around after the broadcast as finished, to be sent to any later * registrations. If your IntentFilter matches one of these sticky * Intents, that Intent will be returned by this function * <strong>and</strong> sent to your <var>receiver</var> as if it had just * been broadcast. * * <p>There may be multiple sticky Intents that match <var>filter</var>, * in which case each of these will be sent to <var>receiver</var>. In * this case, only one of these can be returned directly by the function; * which of these that is returned is arbitrarily decided by the system. * * <p>If you know the Intent your are registering for is sticky, you can * supply null for your <var>receiver</var>. In this case, no receiver is * registered -- the function simply returns the sticky Intent that * matches <var>filter</var>. In the case of multiple matches, the same * rules as described above apply. * * <p>See {@link BroadcastReceiver} for more information on Intent broadcasts. * * <p>As of {@link android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH}, receivers * registered with this method will correctly respect the * {@link Intent#setPackage(String)} specified for an Intent being broadcast. * Prior to that, it would be ignored and delivered to all matching registered * receivers. Be careful if using this for security.</p> * * <p class="note">Note: this method <em>cannot be called from a * {@link BroadcastReceiver} component;</em> that is, from a BroadcastReceiver * that is declared in an application's manifest. It is okay, however, to call * this method from another BroadcastReceiver that has itself been registered * at run time with {@link #registerReceiver}, since the lifetime of such a * registered BroadcastReceiver is tied to the object that registered it.</p> * * @param receiver The BroadcastReceiver to handle the broadcast. * @param filter Selects the Intent broadcasts to be received. * * @return The first sticky intent found that matches <var>filter</var>, * or null if there are none. * * @see #registerReceiver(BroadcastReceiver, IntentFilter, String, Handler) * @see #sendBroadcast * @see #unregisterReceiver */ @Nullable public abstract Intent registerReceiver(@Nullable BroadcastReceiver receiver, IntentFilter filter); /** * Register to receive intent broadcasts, to run in the context of * <var>scheduler</var>. See * {@link #registerReceiver(BroadcastReceiver, IntentFilter)} for more * information. This allows you to enforce permissions on who can * broadcast intents to your receiver, or have the receiver run in * a different thread than the main application thread. * * <p>See {@link BroadcastReceiver} for more information on Intent broadcasts. * * <p>As of {@link android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH}, receivers * registered with this method will correctly respect the * {@link Intent#setPackage(String)} specified for an Intent being broadcast. * Prior to that, it would be ignored and delivered to all matching registered * receivers. Be careful if using this for security.</p> * * @param receiver The BroadcastReceiver to handle the broadcast. * @param filter Selects the Intent broadcasts to be received. * @param broadcastPermission String naming a permissions that a * broadcaster must hold in order to send an Intent to you. If null, * no permission is required. * @param scheduler Handler identifying the thread that will receive * the Intent. If null, the main thread of the process will be used. * * @return The first sticky intent found that matches <var>filter</var>, * or null if there are none. * * @see #registerReceiver(BroadcastReceiver, IntentFilter) * @see #sendBroadcast * @see #unregisterReceiver */ @Nullable public abstract Intent registerReceiver(BroadcastReceiver receiver, IntentFilter filter, @Nullable String broadcastPermission, @Nullable Handler scheduler); /** * @hide * Same as {@link #registerReceiver(BroadcastReceiver, IntentFilter, String, Handler) * but for a specific user. This receiver will receiver broadcasts that * are sent to the requested user. It * requires holding the {@link android.Manifest.permission#INTERACT_ACROSS_USERS_FULL} * permission. * * @param receiver The BroadcastReceiver to handle the broadcast. * @param user UserHandle to send the intent to. * @param filter Selects the Intent broadcasts to be received. * @param broadcastPermission String naming a permissions that a * broadcaster must hold in order to send an Intent to you. If null, * no permission is required. * @param scheduler Handler identifying the thread that will receive * the Intent. If null, the main thread of the process will be used. * * @return The first sticky intent found that matches <var>filter</var>, * or null if there are none. * * @see #registerReceiver(BroadcastReceiver, IntentFilter, String, Handler * @see #sendBroadcast * @see #unregisterReceiver */ @Nullable public abstract Intent registerReceiverAsUser(BroadcastReceiver receiver, UserHandle user, IntentFilter filter, @Nullable String broadcastPermission, @Nullable Handler scheduler); /** * Unregister a previously registered BroadcastReceiver. <em>All</em> * filters that have been registered for this BroadcastReceiver will be * removed. * * @param receiver The BroadcastReceiver to unregister. * * @see #registerReceiver */ public abstract void unregisterReceiver(BroadcastReceiver receiver); /** * Request that a given application service be started. The Intent * should contain either contain the complete class name of a specific service * implementation to start or a specific package name to target. If the * Intent is less specified, it log a warning about this and which of the * multiple matching services it finds and uses will be undefined. If this service * is not already running, it will be instantiated and started (creating a * process for it if needed); if it is running then it remains running. * * <p>Every call to this method will result in a corresponding call to * the target service's {@link android.app.Service#onStartCommand} method, * with the <var>intent</var> given here. This provides a convenient way * to submit jobs to a service without having to bind and call on to its * interface. * * <p>Using startService() overrides the default service lifetime that is * managed by {@link #bindService}: it requires the service to remain * running until {@link #stopService} is called, regardless of whether * any clients are connected to it. Note that calls to startService() * are not nesting: no matter how many times you call startService(), * a single call to {@link #stopService} will stop it. * * <p>The system attempts to keep running services around as much as * possible. The only time they should be stopped is if the current * foreground application is using so many resources that the service needs * to be killed. If any errors happen in the service's process, it will * automatically be restarted. * * <p>This function will throw {@link SecurityException} if you do not * have permission to start the given service. * * @param service Identifies the service to be started. The Intent must be either * fully explicit (supplying a component name) or specify a specific package * name it is targetted to. Additional values * may be included in the Intent extras to supply arguments along with * this specific start call. * * @return If the service is being started or is already running, the * {@link ComponentName} of the actual service that was started is * returned; else if the service does not exist null is returned. * * @throws SecurityException * * @see #stopService * @see #bindService */ @Nullable public abstract ComponentName startService(Intent service); /** * Request that a given application service be stopped. If the service is * not running, nothing happens. Otherwise it is stopped. Note that calls * to startService() are not counted -- this stops the service no matter * how many times it was started. * * <p>Note that if a stopped service still has {@link ServiceConnection} * objects bound to it with the {@link #BIND_AUTO_CREATE} set, it will * not be destroyed until all of these bindings are removed. See * the {@link android.app.Service} documentation for more details on a * service's lifecycle. * * <p>This function will throw {@link SecurityException} if you do not * have permission to stop the given service. * * @param service Description of the service to be stopped. The Intent must be either * fully explicit (supplying a component name) or specify a specific package * name it is targetted to. * * @return If there is a service matching the given Intent that is already * running, then it is stopped and {@code true} is returned; else {@code false} is returned. * * @throws SecurityException * * @see #startService */ public abstract boolean stopService(Intent service); /** * @hide like {@link #startService(Intent)} but for a specific user. */ public abstract ComponentName startServiceAsUser(Intent service, UserHandle user); /** * @hide like {@link #stopService(Intent)} but for a specific user. */ public abstract boolean stopServiceAsUser(Intent service, UserHandle user); /** * Connect to an application service, creating it if needed. This defines * a dependency between your application and the service. The given * <var>conn</var> will receive the service object when it is created and be * told if it dies and restarts. The service will be considered required * by the system only for as long as the calling context exists. For * example, if this Context is an Activity that is stopped, the service will * not be required to continue running until the Activity is resumed. * * <p>This function will throw {@link SecurityException} if you do not * have permission to bind to the given service. * * <p class="note">Note: this method <em>can not be called from a * {@link BroadcastReceiver} component</em>. A pattern you can use to * communicate from a BroadcastReceiver to a Service is to call * {@link #startService} with the arguments containing the command to be * sent, with the service calling its * {@link android.app.Service#stopSelf(int)} method when done executing * that command. See the API demo App/Service/Service Start Arguments * Controller for an illustration of this. It is okay, however, to use * this method from a BroadcastReceiver that has been registered with * {@link #registerReceiver}, since the lifetime of this BroadcastReceiver * is tied to another object (the one that registered it).</p> * * @param service Identifies the service to connect to. The Intent may * specify either an explicit component name, or a logical * description (action, category, etc) to match an * {@link IntentFilter} published by a service. * @param conn Receives information as the service is started and stopped. * This must be a valid ServiceConnection object; it must not be null. * @param flags Operation options for the binding. May be 0, * {@link #BIND_AUTO_CREATE}, {@link #BIND_DEBUG_UNBIND}, * {@link #BIND_NOT_FOREGROUND}, {@link #BIND_ABOVE_CLIENT}, * {@link #BIND_ALLOW_OOM_MANAGEMENT}, or * {@link #BIND_WAIVE_PRIORITY}. * @return If you have successfully bound to the service, {@code true} is returned; * {@code false} is returned if the connection is not made so you will not * receive the service object. * * @throws SecurityException * * @see #unbindService * @see #startService * @see #BIND_AUTO_CREATE * @see #BIND_DEBUG_UNBIND * @see #BIND_NOT_FOREGROUND */ public abstract boolean bindService(Intent service, @NonNull ServiceConnection conn, @BindServiceFlags int flags); /** * Same as {@link #bindService(Intent, ServiceConnection, int)}, but with an explicit userHandle * argument for use by system server and other multi-user aware code. * @hide */ @SystemApi public boolean bindServiceAsUser(Intent service, ServiceConnection conn, int flags, UserHandle user) { throw new RuntimeException("Not implemented. Must override in a subclass."); } /** * Disconnect from an application service. You will no longer receive * calls as the service is restarted, and the service is now allowed to * stop at any time. * * @param conn The connection interface previously supplied to * bindService(). This parameter must not be null. * * @see #bindService */ public abstract void unbindService(@NonNull ServiceConnection conn); /** * Start executing an {@link android.app.Instrumentation} class. The given * Instrumentation component will be run by killing its target application * (if currently running), starting the target process, instantiating the * instrumentation component, and then letting it drive the application. * * <p>This function is not synchronous -- it returns as soon as the * instrumentation has started and while it is running. * * <p>Instrumentation is normally only allowed to run against a package * that is either unsigned or signed with a signature that the * the instrumentation package is also signed with (ensuring the target * trusts the instrumentation). * * @param className Name of the Instrumentation component to be run. * @param profileFile Optional path to write profiling data as the * instrumentation runs, or null for no profiling. * @param arguments Additional optional arguments to pass to the * instrumentation, or null. * * @return {@code true} if the instrumentation was successfully started, * else {@code false} if it could not be found. */ public abstract boolean startInstrumentation(@NonNull ComponentName className, @Nullable String profileFile, @Nullable Bundle arguments); /** @hide */ @StringDef({ POWER_SERVICE, WINDOW_SERVICE, LAYOUT_INFLATER_SERVICE, ACCOUNT_SERVICE, ACTIVITY_SERVICE, ALARM_SERVICE, NOTIFICATION_SERVICE, ACCESSIBILITY_SERVICE, CAPTIONING_SERVICE, KEYGUARD_SERVICE, LOCATION_SERVICE, //@hide: COUNTRY_DETECTOR, SEARCH_SERVICE, SENSOR_SERVICE, STORAGE_SERVICE, WALLPAPER_SERVICE, VIBRATOR_SERVICE, //@hide: STATUS_BAR_SERVICE, CONNECTIVITY_SERVICE, //@hide: UPDATE_LOCK_SERVICE, //@hide: NETWORKMANAGEMENT_SERVICE, //@hide: NETWORK_STATS_SERVICE, //@hide: NETWORK_POLICY_SERVICE, WIFI_SERVICE, WIFI_PASSPOINT_SERVICE, WIFI_P2P_SERVICE, WIFI_SCANNING_SERVICE, //@hide: ETHERNET_SERVICE, WIFI_RTT_SERVICE, NSD_SERVICE, AUDIO_SERVICE, MEDIA_ROUTER_SERVICE, TELEPHONY_SERVICE, TELECOM_SERVICE, CLIPBOARD_SERVICE, INPUT_METHOD_SERVICE, TEXT_SERVICES_MANAGER_SERVICE, APPWIDGET_SERVICE, //@hide: BACKUP_SERVICE, DROPBOX_SERVICE, DEVICE_POLICY_SERVICE, UI_MODE_SERVICE, DOWNLOAD_SERVICE, NFC_SERVICE, BLUETOOTH_SERVICE, //@hide: SIP_SERVICE, USB_SERVICE, LAUNCHER_APPS_SERVICE, //@hide: SERIAL_SERVICE, INPUT_SERVICE, DISPLAY_SERVICE, //@hide: SCHEDULING_POLICY_SERVICE, USER_SERVICE, //@hide: APP_OPS_SERVICE CAMERA_SERVICE, PRINT_SERVICE, MEDIA_SESSION_SERVICE, BATTERY_SERVICE, JOB_SCHEDULER_SERVICE, MEDIA_PROJECTION_SERVICE, }) @Retention(RetentionPolicy.SOURCE) public @interface ServiceName {} /** * Return the handle to a system-level service by name. The class of the * returned object varies by the requested name. Currently available names * are: * * <dl> * <dt> {@link #WINDOW_SERVICE} ("window") * <dd> The top-level window manager in which you can place custom * windows. The returned object is a {@link android.view.WindowManager}. * <dt> {@link #LAYOUT_INFLATER_SERVICE} ("layout_inflater") * <dd> A {@link android.view.LayoutInflater} for inflating layout resources * in this context. * <dt> {@link #ACTIVITY_SERVICE} ("activity") * <dd> A {@link android.app.ActivityManager} for interacting with the * global activity state of the system. * <dt> {@link #POWER_SERVICE} ("power") * <dd> A {@link android.os.PowerManager} for controlling power * management. * <dt> {@link #ALARM_SERVICE} ("alarm") * <dd> A {@link android.app.AlarmManager} for receiving intents at the * time of your choosing. * <dt> {@link #NOTIFICATION_SERVICE} ("notification") * <dd> A {@link android.app.NotificationManager} for informing the user * of background events. * <dt> {@link #KEYGUARD_SERVICE} ("keyguard") * <dd> A {@link android.app.KeyguardManager} for controlling keyguard. * <dt> {@link #LOCATION_SERVICE} ("location") * <dd> A {@link android.location.LocationManager} for controlling location * (e.g., GPS) updates. * <dt> {@link #SEARCH_SERVICE} ("search") * <dd> A {@link android.app.SearchManager} for handling search. * <dt> {@link #VIBRATOR_SERVICE} ("vibrator") * <dd> A {@link android.os.Vibrator} for interacting with the vibrator * hardware. * <dt> {@link #CONNECTIVITY_SERVICE} ("connection") * <dd> A {@link android.net.ConnectivityManager ConnectivityManager} for * handling management of network connections. * <dt> {@link #WIFI_SERVICE} ("wifi") * <dd> A {@link android.net.wifi.WifiManager WifiManager} for management of * Wi-Fi connectivity. * <dt> {@link #WIFI_P2P_SERVICE} ("wifip2p") * <dd> A {@link android.net.wifi.p2p.WifiP2pManager WifiP2pManager} for management of * Wi-Fi Direct connectivity. * <dt> {@link #INPUT_METHOD_SERVICE} ("input_method") * <dd> An {@link android.view.inputmethod.InputMethodManager InputMethodManager} * for management of input methods. * <dt> {@link #UI_MODE_SERVICE} ("uimode") * <dd> An {@link android.app.UiModeManager} for controlling UI modes. * <dt> {@link #DOWNLOAD_SERVICE} ("download") * <dd> A {@link android.app.DownloadManager} for requesting HTTP downloads * <dt> {@link #BATTERY_SERVICE} ("batterymanager") * <dd> A {@link android.os.BatteryManager} for managing battery state * <dt> {@link #JOB_SCHEDULER_SERVICE} ("taskmanager") * <dd> A {@link android.app.job.JobScheduler} for managing scheduled tasks * </dl> * * <p>Note: System services obtained via this API may be closely associated with * the Context in which they are obtained from. In general, do not share the * service objects between various different contexts (Activities, Applications, * Services, Providers, etc.) * * @param name The name of the desired service. * * @return The service or null if the name does not exist. * * @see #WINDOW_SERVICE * @see android.view.WindowManager * @see #LAYOUT_INFLATER_SERVICE * @see android.view.LayoutInflater * @see #ACTIVITY_SERVICE * @see android.app.ActivityManager * @see #POWER_SERVICE * @see android.os.PowerManager * @see #ALARM_SERVICE * @see android.app.AlarmManager * @see #NOTIFICATION_SERVICE * @see android.app.NotificationManager * @see #KEYGUARD_SERVICE * @see android.app.KeyguardManager * @see #LOCATION_SERVICE * @see android.location.LocationManager * @see #SEARCH_SERVICE * @see android.app.SearchManager * @see #SENSOR_SERVICE * @see android.hardware.SensorManager * @see #STORAGE_SERVICE * @see android.os.storage.StorageManager * @see #VIBRATOR_SERVICE * @see android.os.Vibrator * @see #CONNECTIVITY_SERVICE * @see android.net.ConnectivityManager * @see #WIFI_SERVICE * @see android.net.wifi.WifiManager * @see #AUDIO_SERVICE * @see android.media.AudioManager * @see #MEDIA_ROUTER_SERVICE * @see android.media.MediaRouter * @see #TELEPHONY_SERVICE * @see android.telephony.TelephonyManager * @see #TELEPHONY_SUBSCRIPTION_SERVICE * @see android.telephony.SubscriptionManager * @see #INPUT_METHOD_SERVICE * @see android.view.inputmethod.InputMethodManager * @see #UI_MODE_SERVICE * @see android.app.UiModeManager * @see #DOWNLOAD_SERVICE * @see android.app.DownloadManager * @see #BATTERY_SERVICE * @see android.os.BatteryManager * @see #JOB_SCHEDULER_SERVICE * @see android.app.job.JobScheduler */ public abstract Object getSystemService(@ServiceName @NonNull String name); /** * Use with {@link #getSystemService} to retrieve a * {@link android.os.PowerManager} for controlling power management, * including "wake locks," which let you keep the device on while * you're running long tasks. */ public static final String POWER_SERVICE = "power"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.view.WindowManager} for accessing the system's window * manager. * * @see #getSystemService * @see android.view.WindowManager */ public static final String WINDOW_SERVICE = "window"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.view.LayoutInflater} for inflating layout resources in this * context. * * @see #getSystemService * @see android.view.LayoutInflater */ public static final String LAYOUT_INFLATER_SERVICE = "layout_inflater"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.accounts.AccountManager} for receiving intents at a * time of your choosing. * * @see #getSystemService * @see android.accounts.AccountManager */ public static final String ACCOUNT_SERVICE = "account"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.app.ActivityManager} for interacting with the global * system state. * * @see #getSystemService * @see android.app.ActivityManager */ public static final String ACTIVITY_SERVICE = "activity"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.app.AlarmManager} for receiving intents at a * time of your choosing. * * @see #getSystemService * @see android.app.AlarmManager */ public static final String ALARM_SERVICE = "alarm"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.app.NotificationManager} for informing the user of * background events. * * @see #getSystemService * @see android.app.NotificationManager */ public static final String NOTIFICATION_SERVICE = "notification"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.view.accessibility.AccessibilityManager} for giving the user * feedback for UI events through the registered event listeners. * * @see #getSystemService * @see android.view.accessibility.AccessibilityManager */ public static final String ACCESSIBILITY_SERVICE = "accessibility"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.view.accessibility.CaptioningManager} for obtaining * captioning properties and listening for changes in captioning * preferences. * * @see #getSystemService * @see android.view.accessibility.CaptioningManager */ public static final String CAPTIONING_SERVICE = "captioning"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.app.NotificationManager} for controlling keyguard. * * @see #getSystemService * @see android.app.KeyguardManager */ public static final String KEYGUARD_SERVICE = "keyguard"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.location.LocationManager} for controlling location * updates. * * @see #getSystemService * @see android.location.LocationManager */ public static final String LOCATION_SERVICE = "location"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.location.CountryDetector} for detecting the country that * the user is in. * * @hide */ public static final String COUNTRY_DETECTOR = "country_detector"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.app.SearchManager} for handling searches. * * @see #getSystemService * @see android.app.SearchManager */ public static final String SEARCH_SERVICE = "search"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.hardware.SensorManager} for accessing sensors. * * @see #getSystemService * @see android.hardware.SensorManager */ public static final String SENSOR_SERVICE = "sensor"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.os.storage.StorageManager} for accessing system storage * functions. * * @see #getSystemService * @see android.os.storage.StorageManager */ public static final String STORAGE_SERVICE = "storage"; /** * Use with {@link #getSystemService} to retrieve a * com.android.server.WallpaperService for accessing wallpapers. * * @see #getSystemService */ public static final String WALLPAPER_SERVICE = "wallpaper"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.os.Vibrator} for interacting with the vibration hardware. * * @see #getSystemService * @see android.os.Vibrator */ public static final String VIBRATOR_SERVICE = "vibrator"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.app.StatusBarManager} for interacting with the status bar. * * @see #getSystemService * @see android.app.StatusBarManager * @hide */ public static final String STATUS_BAR_SERVICE = "statusbar"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.net.ConnectivityManager} for handling management of * network connections. * * @see #getSystemService * @see android.net.ConnectivityManager */ public static final String CONNECTIVITY_SERVICE = "connectivity"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.os.IUpdateLock} for managing runtime sequences that * must not be interrupted by headless OTA application or similar. * * @hide * @see #getSystemService * @see android.os.UpdateLock */ public static final String UPDATE_LOCK_SERVICE = "updatelock"; /** * Constant for the internal network management service, not really a Context service. * @hide */ public static final String NETWORKMANAGEMENT_SERVICE = "network_management"; /** {@hide} */ public static final String NETWORK_STATS_SERVICE = "netstats"; /** {@hide} */ public static final String NETWORK_POLICY_SERVICE = "netpolicy"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.net.wifi.WifiManager} for handling management of * Wi-Fi access. * * @see #getSystemService * @see android.net.wifi.WifiManager */ public static final String WIFI_SERVICE = "wifi"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.net.wifi.passpoint.WifiPasspointManager} for handling management of * Wi-Fi passpoint access. * * @see #getSystemService * @see android.net.wifi.passpoint.WifiPasspointManager * @hide */ public static final String WIFI_PASSPOINT_SERVICE = "wifipasspoint"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.net.wifi.p2p.WifiP2pManager} for handling management of * Wi-Fi peer-to-peer connections. * * @see #getSystemService * @see android.net.wifi.p2p.WifiP2pManager */ public static final String WIFI_P2P_SERVICE = "wifip2p"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.net.wifi.WifiScanner} for scanning the wifi universe * * @see #getSystemService * @see android.net.wifi.WifiScanner * @hide */ @SystemApi public static final String WIFI_SCANNING_SERVICE = "wifiscanner"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.net.wifi.RttManager} for ranging devices with wifi * * @see #getSystemService * @see android.net.wifi.RttManager * @hide */ @SystemApi public static final String WIFI_RTT_SERVICE = "rttmanager"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.net.EthernetManager} for handling management of * Ethernet access. * * @see #getSystemService * @see android.net.EthernetManager * * @hide */ public static final String ETHERNET_SERVICE = "ethernet"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.net.nsd.NsdManager} for handling management of network service * discovery * * @see #getSystemService * @see android.net.nsd.NsdManager */ public static final String NSD_SERVICE = "servicediscovery"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.media.AudioManager} for handling management of volume, * ringer modes and audio routing. * * @see #getSystemService * @see android.media.AudioManager */ public static final String AUDIO_SERVICE = "audio"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.service.fingerprint.FingerprintManager} for handling management * of fingerprints. * * @see #getSystemService * @see android.app.FingerprintManager * @hide */ public static final String FINGERPRINT_SERVICE = "fingerprint"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.media.MediaRouter} for controlling and managing * routing of media. * * @see #getSystemService * @see android.media.MediaRouter */ public static final String MEDIA_ROUTER_SERVICE = "media_router"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.media.session.MediaSessionManager} for managing media Sessions. * * @see #getSystemService * @see android.media.session.MediaSessionManager */ public static final String MEDIA_SESSION_SERVICE = "media_session"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.telephony.TelephonyManager} for handling management the * telephony features of the device. * * @see #getSystemService * @see android.telephony.TelephonyManager */ public static final String TELEPHONY_SERVICE = "phone"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.telephony.SubscriptionManager} for handling management the * telephony subscriptions of the device. * * @see #getSystemService * @see android.telephony.SubscriptionManager */ public static final String TELEPHONY_SUBSCRIPTION_SERVICE = "telephony_subscription_service"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.telecom.TelecomManager} to manage telecom-related features * of the device. * * @see #getSystemService * @see android.telecom.TelecomManager */ public static final String TELECOM_SERVICE = "telecom"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.text.ClipboardManager} for accessing and modifying * the contents of the global clipboard. * * @see #getSystemService * @see android.text.ClipboardManager */ public static final String CLIPBOARD_SERVICE = "clipboard"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.view.inputmethod.InputMethodManager} for accessing input * methods. * * @see #getSystemService */ public static final String INPUT_METHOD_SERVICE = "input_method"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.view.textservice.TextServicesManager} for accessing * text services. * * @see #getSystemService */ public static final String TEXT_SERVICES_MANAGER_SERVICE = "textservices"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.appwidget.AppWidgetManager} for accessing AppWidgets. * * @see #getSystemService */ public static final String APPWIDGET_SERVICE = "appwidget"; /** * Official published name of the (internal) voice interaction manager service. * * @hide * @see #getSystemService */ public static final String VOICE_INTERACTION_MANAGER_SERVICE = "voiceinteraction"; /** * Use with {@link #getSystemService} to retrieve an * {@link android.app.backup.IBackupManager IBackupManager} for communicating * with the backup mechanism. * @hide * * @see #getSystemService */ @SystemApi public static final String BACKUP_SERVICE = "backup"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.os.DropBoxManager} instance for recording * diagnostic logs. * @see #getSystemService */ public static final String DROPBOX_SERVICE = "dropbox"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.app.admin.DevicePolicyManager} for working with global * device policy management. * * @see #getSystemService */ public static final String DEVICE_POLICY_SERVICE = "device_policy"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.app.UiModeManager} for controlling UI modes. * * @see #getSystemService */ public static final String UI_MODE_SERVICE = "uimode"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.app.DownloadManager} for requesting HTTP downloads. * * @see #getSystemService */ public static final String DOWNLOAD_SERVICE = "download"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.os.BatteryManager} for managing battery state. * * @see #getSystemService */ public static final String BATTERY_SERVICE = "batterymanager"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.nfc.NfcManager} for using NFC. * * @see #getSystemService */ public static final String NFC_SERVICE = "nfc"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.bluetooth.BluetoothAdapter} for using Bluetooth. * * @see #getSystemService */ public static final String BLUETOOTH_SERVICE = "bluetooth"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.net.sip.SipManager} for accessing the SIP related service. * * @see #getSystemService */ /** @hide */ public static final String SIP_SERVICE = "sip"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.hardware.usb.UsbManager} for access to USB devices (as a USB host) * and for controlling this device's behavior as a USB device. * * @see #getSystemService * @see android.hardware.usb.UsbManager */ public static final String USB_SERVICE = "usb"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.hardware.SerialManager} for access to serial ports. * * @see #getSystemService * @see android.hardware.SerialManager * * @hide */ public static final String SERIAL_SERVICE = "serial"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.hardware.hdmi.HdmiControlManager} for controlling and managing * HDMI-CEC protocol. * * @see #getSystemService * @see android.hardware.hdmi.HdmiControlManager * @hide */ @SystemApi public static final String HDMI_CONTROL_SERVICE = "hdmi_control"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.hardware.input.InputManager} for interacting with input devices. * * @see #getSystemService * @see android.hardware.input.InputManager */ public static final String INPUT_SERVICE = "input"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.hardware.display.DisplayManager} for interacting with display devices. * * @see #getSystemService * @see android.hardware.display.DisplayManager */ public static final String DISPLAY_SERVICE = "display"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.os.UserManager} for managing users on devices that support multiple users. * * @see #getSystemService * @see android.os.UserManager */ public static final String USER_SERVICE = "user"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.content.pm.LauncherApps} for querying and monitoring launchable apps across * profiles of a user. * * @see #getSystemService * @see android.content.pm.LauncherApps */ public static final String LAUNCHER_APPS_SERVICE = "launcherapps"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.content.RestrictionsManager} for retrieving application restrictions * and requesting permissions for restricted operations. * @see #getSystemService * @see android.content.RestrictionsManager */ public static final String RESTRICTIONS_SERVICE = "restrictions"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.app.AppOpsManager} for tracking application operations * on the device. * * @see #getSystemService * @see android.app.AppOpsManager */ public static final String APP_OPS_SERVICE = "appops"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.hardware.camera2.CameraManager} for interacting with * camera devices. * * @see #getSystemService * @see android.hardware.camera2.CameraManager */ public static final String CAMERA_SERVICE = "camera"; /** * {@link android.print.PrintManager} for printing and managing * printers and print tasks. * * @see #getSystemService * @see android.print.PrintManager */ public static final String PRINT_SERVICE = "print"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.hardware.ConsumerIrManager} for transmitting infrared * signals from the device. * * @see #getSystemService * @see android.hardware.ConsumerIrManager */ public static final String CONSUMER_IR_SERVICE = "consumer_ir"; /** * {@link android.app.trust.TrustManager} for managing trust agents. * @see #getSystemService * @see android.app.trust.TrustManager * @hide */ public static final String TRUST_SERVICE = "trust"; /** * Use with {@link #getSystemService} to retrieve a * {@link android.media.tv.TvInputManager} for interacting with TV inputs * on the device. * * @see #getSystemService * @see android.media.tv.TvInputManager */ public static final String TV_INPUT_SERVICE = "tv_input"; /** * {@link android.net.NetworkScoreManager} for managing network scoring. * @see #getSystemService * @see android.net.NetworkScoreManager * @hide */ @SystemApi public static final String NETWORK_SCORE_SERVICE = "network_score"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.app.usage.UsageStatsManager} for querying device usage stats. * * @see #getSystemService * @see android.app.usage.UsageStatsManager */ public static final String USAGE_STATS_SERVICE = "usagestats"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.app.job.JobScheduler} instance for managing occasional * background tasks. * @see #getSystemService * @see android.app.job.JobScheduler */ public static final String JOB_SCHEDULER_SERVICE = "jobscheduler"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.service.persistentdata.PersistentDataBlockManager} instance * for interacting with a storage device that lives across factory resets. * * @see #getSystemService * @see android.service.persistentdata.PersistentDataBlockManager * @hide */ @SystemApi public static final String PERSISTENT_DATA_BLOCK_SERVICE = "persistent_data_block"; /** * Use with {@link #getSystemService} to retrieve a {@link * android.media.projection.MediaProjectionManager} instance for managing * media projection sessions. * @see #getSystemService * @see android.media.projection.ProjectionManager */ public static final String MEDIA_PROJECTION_SERVICE = "media_projection"; /** * Determine whether the given permission is allowed for a particular * process and user ID running in the system. * * @param permission The name of the permission being checked. * @param pid The process ID being checked against. Must be > 0. * @param uid The user ID being checked against. A uid of 0 is the root * user, which will pass every permission check. * * @return {@link PackageManager#PERMISSION_GRANTED} if the given * pid/uid is allowed that permission, or * {@link PackageManager#PERMISSION_DENIED} if it is not. * * @see PackageManager#checkPermission(String, String) * @see #checkCallingPermission */ @PackageManager.PermissionResult public abstract int checkPermission(@NonNull String permission, int pid, int uid); /** @hide */ @PackageManager.PermissionResult public abstract int checkPermission(@NonNull String permission, int pid, int uid, IBinder callerToken); /** * Determine whether the calling process of an IPC you are handling has been * granted a particular permission. This is basically the same as calling * {@link #checkPermission(String, int, int)} with the pid and uid returned * by {@link android.os.Binder#getCallingPid} and * {@link android.os.Binder#getCallingUid}. One important difference * is that if you are not currently processing an IPC, this function * will always fail. This is done to protect against accidentally * leaking permissions; you can use {@link #checkCallingOrSelfPermission} * to avoid this protection. * * @param permission The name of the permission being checked. * * @return {@link PackageManager#PERMISSION_GRANTED} if the calling * pid/uid is allowed that permission, or * {@link PackageManager#PERMISSION_DENIED} if it is not. * * @see PackageManager#checkPermission(String, String) * @see #checkPermission * @see #checkCallingOrSelfPermission */ @PackageManager.PermissionResult public abstract int checkCallingPermission(@NonNull String permission); /** * Determine whether the calling process of an IPC <em>or you</em> have been * granted a particular permission. This is the same as * {@link #checkCallingPermission}, except it grants your own permissions * if you are not currently processing an IPC. Use with care! * * @param permission The name of the permission being checked. * * @return {@link PackageManager#PERMISSION_GRANTED} if the calling * pid/uid is allowed that permission, or * {@link PackageManager#PERMISSION_DENIED} if it is not. * * @see PackageManager#checkPermission(String, String) * @see #checkPermission * @see #checkCallingPermission */ @PackageManager.PermissionResult public abstract int checkCallingOrSelfPermission(@NonNull String permission); /** * If the given permission is not allowed for a particular process * and user ID running in the system, throw a {@link SecurityException}. * * @param permission The name of the permission being checked. * @param pid The process ID being checked against. Must be > 0. * @param uid The user ID being checked against. A uid of 0 is the root * user, which will pass every permission check. * @param message A message to include in the exception if it is thrown. * * @see #checkPermission(String, int, int) */ public abstract void enforcePermission( @NonNull String permission, int pid, int uid, @Nullable String message); /** * If the calling process of an IPC you are handling has not been * granted a particular permission, throw a {@link * SecurityException}. This is basically the same as calling * {@link #enforcePermission(String, int, int, String)} with the * pid and uid returned by {@link android.os.Binder#getCallingPid} * and {@link android.os.Binder#getCallingUid}. One important * difference is that if you are not currently processing an IPC, * this function will always throw the SecurityException. This is * done to protect against accidentally leaking permissions; you * can use {@link #enforceCallingOrSelfPermission} to avoid this * protection. * * @param permission The name of the permission being checked. * @param message A message to include in the exception if it is thrown. * * @see #checkCallingPermission(String) */ public abstract void enforceCallingPermission( @NonNull String permission, @Nullable String message); /** * If neither you nor the calling process of an IPC you are * handling has been granted a particular permission, throw a * {@link SecurityException}. This is the same as {@link * #enforceCallingPermission}, except it grants your own * permissions if you are not currently processing an IPC. Use * with care! * * @param permission The name of the permission being checked. * @param message A message to include in the exception if it is thrown. * * @see #checkCallingOrSelfPermission(String) */ public abstract void enforceCallingOrSelfPermission( @NonNull String permission, @Nullable String message); /** * Grant permission to access a specific Uri to another package, regardless * of whether that package has general permission to access the Uri's * content provider. This can be used to grant specific, temporary * permissions, typically in response to user interaction (such as the * user opening an attachment that you would like someone else to * display). * * <p>Normally you should use {@link Intent#FLAG_GRANT_READ_URI_PERMISSION * Intent.FLAG_GRANT_READ_URI_PERMISSION} or * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION * Intent.FLAG_GRANT_WRITE_URI_PERMISSION} with the Intent being used to * start an activity instead of this function directly. If you use this * function directly, you should be sure to call * {@link #revokeUriPermission} when the target should no longer be allowed * to access it. * * <p>To succeed, the content provider owning the Uri must have set the * {@link android.R.styleable#AndroidManifestProvider_grantUriPermissions * grantUriPermissions} attribute in its manifest or included the * {@link android.R.styleable#AndroidManifestGrantUriPermission * <grant-uri-permissions>} tag. * * @param toPackage The package you would like to allow to access the Uri. * @param uri The Uri you would like to grant access to. * @param modeFlags The desired access modes. Any combination of * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION * Intent.FLAG_GRANT_READ_URI_PERMISSION}, * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION * Intent.FLAG_GRANT_WRITE_URI_PERMISSION}, * {@link Intent#FLAG_GRANT_PERSISTABLE_URI_PERMISSION * Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION}, or * {@link Intent#FLAG_GRANT_PREFIX_URI_PERMISSION * Intent.FLAG_GRANT_PREFIX_URI_PERMISSION}. * * @see #revokeUriPermission */ public abstract void grantUriPermission(String toPackage, Uri uri, @Intent.GrantUriMode int modeFlags); /** * Remove all permissions to access a particular content provider Uri * that were previously added with {@link #grantUriPermission}. The given * Uri will match all previously granted Uris that are the same or a * sub-path of the given Uri. That is, revoking "content://foo/target" will * revoke both "content://foo/target" and "content://foo/target/sub", but not * "content://foo". It will not remove any prefix grants that exist at a * higher level. * * <p>Prior to {@link android.os.Build.VERSION_CODES#LOLLIPOP}, if you did not have * regular permission access to a Uri, but had received access to it through * a specific Uri permission grant, you could not revoke that grant with this * function and a {@link SecurityException} would be thrown. As of * {@link android.os.Build.VERSION_CODES#LOLLIPOP}, this function will not throw a security exception, * but will remove whatever permission grants to the Uri had been given to the app * (or none).</p> * * @param uri The Uri you would like to revoke access to. * @param modeFlags The desired access modes. Any combination of * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION * Intent.FLAG_GRANT_READ_URI_PERMISSION} or * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION * Intent.FLAG_GRANT_WRITE_URI_PERMISSION}. * * @see #grantUriPermission */ public abstract void revokeUriPermission(Uri uri, @Intent.AccessUriMode int modeFlags); /** * Determine whether a particular process and user ID has been granted * permission to access a specific URI. This only checks for permissions * that have been explicitly granted -- if the given process/uid has * more general access to the URI's content provider then this check will * always fail. * * @param uri The uri that is being checked. * @param pid The process ID being checked against. Must be > 0. * @param uid The user ID being checked against. A uid of 0 is the root * user, which will pass every permission check. * @param modeFlags The type of access to grant. May be one or both of * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION Intent.FLAG_GRANT_READ_URI_PERMISSION} or * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION Intent.FLAG_GRANT_WRITE_URI_PERMISSION}. * * @return {@link PackageManager#PERMISSION_GRANTED} if the given * pid/uid is allowed to access that uri, or * {@link PackageManager#PERMISSION_DENIED} if it is not. * * @see #checkCallingUriPermission */ public abstract int checkUriPermission(Uri uri, int pid, int uid, @Intent.AccessUriMode int modeFlags); /** @hide */ public abstract int checkUriPermission(Uri uri, int pid, int uid, @Intent.AccessUriMode int modeFlags, IBinder callerToken); /** * Determine whether the calling process and user ID has been * granted permission to access a specific URI. This is basically * the same as calling {@link #checkUriPermission(Uri, int, int, * int)} with the pid and uid returned by {@link * android.os.Binder#getCallingPid} and {@link * android.os.Binder#getCallingUid}. One important difference is * that if you are not currently processing an IPC, this function * will always fail. * * @param uri The uri that is being checked. * @param modeFlags The type of access to grant. May be one or both of * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION Intent.FLAG_GRANT_READ_URI_PERMISSION} or * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION Intent.FLAG_GRANT_WRITE_URI_PERMISSION}. * * @return {@link PackageManager#PERMISSION_GRANTED} if the caller * is allowed to access that uri, or * {@link PackageManager#PERMISSION_DENIED} if it is not. * * @see #checkUriPermission(Uri, int, int, int) */ public abstract int checkCallingUriPermission(Uri uri, @Intent.AccessUriMode int modeFlags); /** * Determine whether the calling process of an IPC <em>or you</em> has been granted * permission to access a specific URI. This is the same as * {@link #checkCallingUriPermission}, except it grants your own permissions * if you are not currently processing an IPC. Use with care! * * @param uri The uri that is being checked. * @param modeFlags The type of access to grant. May be one or both of * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION Intent.FLAG_GRANT_READ_URI_PERMISSION} or * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION Intent.FLAG_GRANT_WRITE_URI_PERMISSION}. * * @return {@link PackageManager#PERMISSION_GRANTED} if the caller * is allowed to access that uri, or * {@link PackageManager#PERMISSION_DENIED} if it is not. * * @see #checkCallingUriPermission */ public abstract int checkCallingOrSelfUriPermission(Uri uri, @Intent.AccessUriMode int modeFlags); /** * Check both a Uri and normal permission. This allows you to perform * both {@link #checkPermission} and {@link #checkUriPermission} in one * call. * * @param uri The Uri whose permission is to be checked, or null to not * do this check. * @param readPermission The permission that provides overall read access, * or null to not do this check. * @param writePermission The permission that provides overall write * access, or null to not do this check. * @param pid The process ID being checked against. Must be > 0. * @param uid The user ID being checked against. A uid of 0 is the root * user, which will pass every permission check. * @param modeFlags The type of access to grant. May be one or both of * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION Intent.FLAG_GRANT_READ_URI_PERMISSION} or * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION Intent.FLAG_GRANT_WRITE_URI_PERMISSION}. * * @return {@link PackageManager#PERMISSION_GRANTED} if the caller * is allowed to access that uri or holds one of the given permissions, or * {@link PackageManager#PERMISSION_DENIED} if it is not. */ public abstract int checkUriPermission(@Nullable Uri uri, @Nullable String readPermission, @Nullable String writePermission, int pid, int uid, @Intent.AccessUriMode int modeFlags); /** * If a particular process and user ID has not been granted * permission to access a specific URI, throw {@link * SecurityException}. This only checks for permissions that have * been explicitly granted -- if the given process/uid has more * general access to the URI's content provider then this check * will always fail. * * @param uri The uri that is being checked. * @param pid The process ID being checked against. Must be > 0. * @param uid The user ID being checked against. A uid of 0 is the root * user, which will pass every permission check. * @param modeFlags The type of access to grant. May be one or both of * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION Intent.FLAG_GRANT_READ_URI_PERMISSION} or * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION Intent.FLAG_GRANT_WRITE_URI_PERMISSION}. * @param message A message to include in the exception if it is thrown. * * @see #checkUriPermission(Uri, int, int, int) */ public abstract void enforceUriPermission( Uri uri, int pid, int uid, @Intent.AccessUriMode int modeFlags, String message); /** * If the calling process and user ID has not been granted * permission to access a specific URI, throw {@link * SecurityException}. This is basically the same as calling * {@link #enforceUriPermission(Uri, int, int, int, String)} with * the pid and uid returned by {@link * android.os.Binder#getCallingPid} and {@link * android.os.Binder#getCallingUid}. One important difference is * that if you are not currently processing an IPC, this function * will always throw a SecurityException. * * @param uri The uri that is being checked. * @param modeFlags The type of access to grant. May be one or both of * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION Intent.FLAG_GRANT_READ_URI_PERMISSION} or * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION Intent.FLAG_GRANT_WRITE_URI_PERMISSION}. * @param message A message to include in the exception if it is thrown. * * @see #checkCallingUriPermission(Uri, int) */ public abstract void enforceCallingUriPermission( Uri uri, @Intent.AccessUriMode int modeFlags, String message); /** * If the calling process of an IPC <em>or you</em> has not been * granted permission to access a specific URI, throw {@link * SecurityException}. This is the same as {@link * #enforceCallingUriPermission}, except it grants your own * permissions if you are not currently processing an IPC. Use * with care! * * @param uri The uri that is being checked. * @param modeFlags The type of access to grant. May be one or both of * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION Intent.FLAG_GRANT_READ_URI_PERMISSION} or * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION Intent.FLAG_GRANT_WRITE_URI_PERMISSION}. * @param message A message to include in the exception if it is thrown. * * @see #checkCallingOrSelfUriPermission(Uri, int) */ public abstract void enforceCallingOrSelfUriPermission( Uri uri, @Intent.AccessUriMode int modeFlags, String message); /** * Enforce both a Uri and normal permission. This allows you to perform * both {@link #enforcePermission} and {@link #enforceUriPermission} in one * call. * * @param uri The Uri whose permission is to be checked, or null to not * do this check. * @param readPermission The permission that provides overall read access, * or null to not do this check. * @param writePermission The permission that provides overall write * access, or null to not do this check. * @param pid The process ID being checked against. Must be > 0. * @param uid The user ID being checked against. A uid of 0 is the root * user, which will pass every permission check. * @param modeFlags The type of access to grant. May be one or both of * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION Intent.FLAG_GRANT_READ_URI_PERMISSION} or * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION Intent.FLAG_GRANT_WRITE_URI_PERMISSION}. * @param message A message to include in the exception if it is thrown. * * @see #checkUriPermission(Uri, String, String, int, int, int) */ public abstract void enforceUriPermission( @Nullable Uri uri, @Nullable String readPermission, @Nullable String writePermission, int pid, int uid, @Intent.AccessUriMode int modeFlags, @Nullable String message); /** @hide */ @IntDef(flag = true, value = {CONTEXT_INCLUDE_CODE, CONTEXT_IGNORE_SECURITY, CONTEXT_RESTRICTED}) @Retention(RetentionPolicy.SOURCE) public @interface CreatePackageOptions {} /** * Flag for use with {@link #createPackageContext}: include the application * code with the context. This means loading code into the caller's * process, so that {@link #getClassLoader()} can be used to instantiate * the application's classes. Setting this flags imposes security * restrictions on what application context you can access; if the * requested application can not be safely loaded into your process, * java.lang.SecurityException will be thrown. If this flag is not set, * there will be no restrictions on the packages that can be loaded, * but {@link #getClassLoader} will always return the default system * class loader. */ public static final int CONTEXT_INCLUDE_CODE = 0x00000001; /** * Flag for use with {@link #createPackageContext}: ignore any security * restrictions on the Context being requested, allowing it to always * be loaded. For use with {@link #CONTEXT_INCLUDE_CODE} to allow code * to be loaded into a process even when it isn't safe to do so. Use * with extreme care! */ public static final int CONTEXT_IGNORE_SECURITY = 0x00000002; /** * Flag for use with {@link #createPackageContext}: a restricted context may * disable specific features. For instance, a View associated with a restricted * context would ignore particular XML attributes. */ public static final int CONTEXT_RESTRICTED = 0x00000004; /** * @hide Used to indicate we should tell the activity manager about the process * loading this code. */ public static final int CONTEXT_REGISTER_PACKAGE = 0x40000000; /** * Return a new Context object for the given application name. This * Context is the same as what the named application gets when it is * launched, containing the same resources and class loader. Each call to * this method returns a new instance of a Context object; Context objects * are not shared, however they share common state (Resources, ClassLoader, * etc) so the Context instance itself is fairly lightweight. * * <p>Throws {@link PackageManager.NameNotFoundException} if there is no * application with the given package name. * * <p>Throws {@link java.lang.SecurityException} if the Context requested * can not be loaded into the caller's process for security reasons (see * {@link #CONTEXT_INCLUDE_CODE} for more information}. * * @param packageName Name of the application's package. * @param flags Option flags, one of {@link #CONTEXT_INCLUDE_CODE} * or {@link #CONTEXT_IGNORE_SECURITY}. * * @return A {@link Context} for the application. * * @throws SecurityException * @throws PackageManager.NameNotFoundException if there is no application with * the given package name. */ public abstract Context createPackageContext(String packageName, @CreatePackageOptions int flags) throws PackageManager.NameNotFoundException; /** * Similar to {@link #createPackageContext(String, int)}, but with a * different {@link UserHandle}. For example, {@link #getContentResolver()} * will open any {@link Uri} as the given user. * * @hide */ public abstract Context createPackageContextAsUser( String packageName, int flags, UserHandle user) throws PackageManager.NameNotFoundException; /** * Creates a context given an {@link android.content.pm.ApplicationInfo}. * * @hide */ public abstract Context createApplicationContext(ApplicationInfo application, int flags) throws PackageManager.NameNotFoundException; /** * Get the userId associated with this context * @return user id * * @hide */ public abstract int getUserId(); /** * Return a new Context object for the current Context but whose resources * are adjusted to match the given Configuration. Each call to this method * returns a new instance of a Context object; Context objects are not * shared, however common state (ClassLoader, other Resources for the * same configuration) may be so the Context itself can be fairly lightweight. * * @param overrideConfiguration A {@link Configuration} specifying what * values to modify in the base Configuration of the original Context's * resources. If the base configuration changes (such as due to an * orientation change), the resources of this context will also change except * for those that have been explicitly overridden with a value here. * * @return A {@link Context} with the given configuration override. */ public abstract Context createConfigurationContext( @NonNull Configuration overrideConfiguration); /** * Return a new Context object for the current Context but whose resources * are adjusted to match the metrics of the given Display. Each call to this method * returns a new instance of a Context object; Context objects are not * shared, however common state (ClassLoader, other Resources for the * same configuration) may be so the Context itself can be fairly lightweight. * * The returned display Context provides a {@link WindowManager} * (see {@link #getSystemService(String)}) that is configured to show windows * on the given display. The WindowManager's {@link WindowManager#getDefaultDisplay} * method can be used to retrieve the Display from the returned Context. * * @param display A {@link Display} object specifying the display * for whose metrics the Context's resources should be tailored and upon which * new windows should be shown. * * @return A {@link Context} for the display. */ public abstract Context createDisplayContext(@NonNull Display display); /** * Gets the display adjustments holder for this context. This information * is provided on a per-application or activity basis and is used to simulate lower density * display metrics for legacy applications and restricted screen sizes. * * @param displayId The display id for which to get compatibility info. * @return The compatibility info holder, or null if not required by the application. * @hide */ public abstract DisplayAdjustments getDisplayAdjustments(int displayId); /** * Indicates whether this Context is restricted. * * @return {@code true} if this Context is restricted, {@code false} otherwise. * * @see #CONTEXT_RESTRICTED */ public boolean isRestricted() { return false; }来说一下下面的写的都是什么，其实基本上就是好多大家常用的方法，大体可以说是this点出来的方法比如包名的获取getPackageName，getApplicationInfo，getPackageResourcePath等等
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