Android Server的bind()与unbind(),以及解绑异常
来源：互联网 发布：带着淘宝去异界 编辑：程序博客网 时间：2024/06/11 15:49
面试的时候被问到这样一个问题，绑定server之后如果不解绑，程序会Crash吗？我擦，蒙逼了，回去之后试了试，不会异常，但是会泄漏
1.异常一：先看一下报的异常吧
12-09 21:03:31.596 5771-5771/com.oblivion.changeactivity I/System.out: oncreate12-09 21:03:31.596 5771-5771/com.oblivion.changeactivity I/System.out: onbind12-09 21:03:34.816 5771-5771/com.oblivion.changeactivity E/ActivityThread: Activity com.oblivion.changeactivity.utils.MainActivity has leaked ServiceConnection com.oblivion.changeactivity.utils.MainActivity$MyConn@5281f840 that was originally bound here android.app.ServiceConnectionLeaked: Activity com.oblivion.changeactivity.utils.MainActivity has leaked ServiceConnection com.oblivion.changeactivity.utils.MainActivity$MyConn@5281f840 that was originally bound here at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:970) at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:864) at android.app.ContextImpl.bindServiceCommon(ContextImpl.java:1577) at android.app.ContextImpl.bindService(ContextImpl.java:1560) at android.content.ContextWrapper.bindService(ContextWrapper.java:517) at com.oblivion.changeactivity.utils.MainActivity.bind(MainActivity.java:26) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at android.view.View$1.onClick(View.java:3818) at android.view.View.performClick(View.java:4438) at android.view.View$PerformClick.run(View.java:18422) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5001) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) at dalvik.system.NativeStart.main(Native Method)12-09 21:03:34.816 5771-5771/com.oblivion.changeactivity I/System.out: onunbind12-09 21:03:34.816 5771-5771/com.oblivion.changeactivity I/System.out: onDestroy这种异常是直接bind之后退出程序（界面不可见出现问题，如果直接干掉程序是没问题的）
2.异常二,不绑定直接退出，也会出异常
同样看一叙异常
12-09 21:12:22.766 20054-20054/com.oblivion.changeactivity D/AndroidRuntime: Shutting down VM12-09 21:12:22.766 20054-20054/com.oblivion.changeactivity W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0xa4d27b20)12-09 21:12:22.766 20054-20054/com.oblivion.changeactivity E/AndroidRuntime: FATAL EXCEPTION: main Process: com.oblivion.changeactivity, PID: 20054 java.lang.IllegalStateException: Could not execute method of the activity at android.view.View$1.onClick(View.java:3823) at android.view.View.performClick(View.java:4438) at android.view.View$PerformClick.run(View.java:18422) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5001) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at android.view.View$1.onClick(View.java:3818) at android.view.View.performClick(View.java:4438) at android.view.View$PerformClick.run(View.java:18422) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5001) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.IllegalArgumentException: connection is null at android.app.ContextImpl.unbindService(ContextImpl.java:1608) at android.content.ContextWrapper.unbindService(ContextWrapper.java:529) at com.oblivion.changeactivity.utils.MainActivity.unbind(MainActivity.java:53) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at android.view.View$1.onClick(View.java:3818) at android.view.View.performClick(View.java:4438) at android.view.View$PerformClick.run(View.java:18422) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5001) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) at dalvik.system.NativeStart.main(Native Method) 光说不练不怎么会体会到，我放一下完整代码,大家跑一下看看
<!--布局文件--><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".utils.MainActivity" > <Button android:onClick="bind" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="绑定服务" /> <Button android:onClick="call" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="调用服务的方法" /> <Button android:onClick="unbind" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="解除绑定服务" /></LinearLayout>MainActivity
package com.oblivion.changeactivity.utils;import android.app.Activity;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.view.View;import com.oblivion.changeactivity.R;public class MainActivity extends Activity { IService iService; MyConn conn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void bind(View view) { Intent intent = new Intent(this, TestService.class); conn = new MyConn(); bindService(intent, conn, BIND_AUTO_CREATE); } private class MyConn implements ServiceConnection { @Override public void onServiceConnected(ComponentName name, IBinder service) { iService = (IService) service; } @Override public void onServiceDisconnected(ComponentName name) { } } /** * 调用借口方法 * * @param view */ public void call(View view) { iService.callMethodInService(); } public void unbind(View view) { unbindService(conn); conn = null; }}Server
package com.oblivion.changeactivity.utils;import android.app.Service;import android.content.Intent;import android.os.Binder;import android.os.IBinder;import android.widget.Toast;public class TestService extends Service { private class MyBinder extends Binder implements IService { @Override public void callMethodInService() { methodInService(); } } private void methodInService() { Toast.makeText(this, "调用Bind方法", Toast.LENGTH_SHORT).show(); } @Override public IBinder onBind(Intent intent) { System.out.println("onbind"); return new MyBinder(); } @Override public boolean onUnbind(Intent intent) { System.out.println("onunbind"); return super.onUnbind(intent); } @Override public void onStart(Intent intent, int startId) { System.out.println("onstart"); super.onStart(intent, startId); } @Override public int onStartCommand(Intent intent, int flags, int startId) { System.out.println("onStartCommand"); return super.onStartCommand(intent, flags, startId); } @Override public void onCreate() { System.out.println("oncreate"); super.onCreate(); } @Override public void onDestroy() { System.out.println("onDestroy"); super.onDestroy(); }}Iserver接口
package com.oblivion.changeactivity.utils;public interface IService { /** * 服务方法 */ public void callMethodInService();}不要忘记在清单中配置
<service android:name=".utils.TestService"></service> 1 0
- Android Server的bind()与unbind(),以及解绑异常
- jQuery的bind和unbind事件（绑定和解绑事件）
- Service 启动 Bind与unBind
- jquery bind()与unbind()用法
- Android入门-Service-start,end,bind,unbind之间的区别
- Service 启动 Bind与unBind区别
- JavaScript中的bind与unbind事件
- jquery中unbind和bind的用法
- Android Service 的延迟绑定与解绑技术
- jQuery学习19---事件中bind与unbind
- SO,KO,BIND,UNBIND
- jquery的bind,unbind,live,data这些函数
- 事件的绑定与解绑
- 项目中的绑卡与解绑
- Mvp的实现以及解绑的关系
- SQL SERVER 规则的创建、绑定、解绑、删除
- jquery: bind() unbind() live() die()
- jquery中unbind、bind注意事项
- ENVI神经网络工具参数和使用方法
- [HNOI2005] 狡猾的商人
- jQuery 导航列表 弹性背景
- Java 枚举类型的使用
- Android自适应不同分辨率的屏幕
- Android Server的bind()与unbind(),以及解绑异常
- scrapy源码分析（十）------------Scraper
- java之旅之foreach
- android开机启动无界面后台程序【转】
- 错排问题
- 关于android 软键盘显示与隐藏监听
- opencv 学习之 液晶数字识别
- 计算机学习层次划分第一阶段：个人能力：技能基础：技术属性
- 【javascript】【中文变量名】
