监听通知栏，back，home键

来源：互联网发布：linux 安装服务编辑：程序博客网时间：2024/06/09 20:18

1，通知栏的下拉和上拉

就是在onWindowFocusChanged()中处理，当Activity重新获得焦点的时候，对界面和数据进行处理，这就解决了上面的问题，其实很简单，换个思维方式就能很好的解决当前的问题。

@Override    public void onWindowFocusChanged(boolean hasFocus) {        super.onWindowFocusChanged(hasFocus);        if(hasFocus){            //如果焦点获得，进行操作        }else{            //如果焦点失去，进行操作    }    }

2，back键

DialogInterface.OnKeyListener keylistener = new DialogInterface.OnKeyListener(){    public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {        if (keyCode==KeyEvent.KEYCODE_BACK&&event.getRepeatCount()==0)        {            return true;        }else        {            return false;        }    }} ;

@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {    if (keyCode == KeyEvent.KEYCODE_BACK            && event.getAction() == KeyEvent.ACTION_DOWN) {        if ((System.currentTimeMillis() - this.exitTime) > 2000) {            this.exitTime = System.currentTimeMillis();            MToast.showToastMsg(mContext, "", Gravity.BOTTOM, 500);        } else {            this.finish();            Application.existApp();            Manager.getInstance().stopSDK();            MobEvent.onKillProcess(this);            System.exit(0);        }        return true;    }    return super.onKeyDown(keyCode, event);}

3，home键

一种是根据生命周期来进行相关的操作，一种是使用广播的方法：对于Home键的监听不是那么容易,因为Home键可以将程序退出放在后台,所以这个事件是直接分发给系统,系统接收到之后做相应处理,Home键的事件不是直接传递到应用里面.所以在上述监听Back键的代码中,相应的回调中是收不到Home键的事件的.

　　参考文后的博客链接,对Home键的监听主要通过注册广播接收器实现,拦截让窗口关闭的系统动作,然后根据Intent里面的具体参数,分析当前到底是Home键, 应用切换键,还是其他功能按键.

　　接收器实现如下:

package com.mengdd.hellohome;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.util.Log;public class HomeWatcherReceiver extends BroadcastReceiver {    private static final String LOG_TAG = "HomeReceiver";    private static final String SYSTEM_DIALOG_REASON_KEY = "reason";    private static final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";    private static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";    private static final String SYSTEM_DIALOG_REASON_LOCK = "lock";    private static final String SYSTEM_DIALOG_REASON_ASSIST = "assist";    @Override    public void onReceive(Context context, Intent intent) {        String action = intent.getAction();        Log.i(LOG_TAG, "onReceive: action: " + action);        if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {            // android.intent.action.CLOSE_SYSTEM_DIALOGS            String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);            Log.i(LOG_TAG, "reason: " + reason);            if (SYSTEM_DIALOG_REASON_HOME_KEY.equals(reason)) {                // 短按Home键                Log.i(LOG_TAG, "homekey");            }            else if (SYSTEM_DIALOG_REASON_RECENT_APPS.equals(reason)) {                // 长按Home键 或者 activity切换键                Log.i(LOG_TAG, "long press home key or activity switch");            }            else if (SYSTEM_DIALOG_REASON_LOCK.equals(reason)) {                // 锁屏                Log.i(LOG_TAG, "lock");            }            else if (SYSTEM_DIALOG_REASON_ASSIST.equals(reason)) {                // samsung 长按Home键                Log.i(LOG_TAG, "assist");            }        }    }}

　　注意不同手机的按键不同,所以需要对不同理由做区分.

Home键监听广播注册

　　广播接收器的注册有两种方式,一种是静态注册,即写在manifest里面声明;另一种是动态注册,即在Java代码里面注册.

　　上面对Home键实现监听的这个receiver,静态注册如下:

        <receiver android:name="com.mengdd.hellohome.HomeWatcherReceiver" >            <intent-filter>                <action android:name="android.intent.action.CLOSE_SYSTEM_DIALOGS" />            </intent-filter>        </receiver>

　　但是发现静态注册不起作用,即收不到onReceive回调.

　　采用动态注册:

    private static HomeWatcherReceiver mHomeKeyReceiver = null;    private static void registerHomeKeyReceiver(Context context) {        Log.i(LOG_TAG, "registerHomeKeyReceiver");        mHomeKeyReceiver = new HomeWatcherReceiver();        final IntentFilter homeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);        context.registerReceiver(mHomeKeyReceiver, homeFilter);    }    private static void unregisterHomeKeyReceiver(Context context) {        Log.i(LOG_TAG, "unregisterHomeKeyReceiver");        if (null != mHomeKeyReceiver) {            context.unregisterReceiver(mHomeKeyReceiver);        }    }

　　在Activity的onResume和onPause里面分别调用:

    @Override    protected void onResume() {        super.onResume();        registerHomeKeyReceiver(this);    }    @Override    protected void onPause() {        unregisterHomeKeyReceiver(this);        super.onPause();    }

　　当然也可以根据需要在其他合适的时机注册和注销.

0 0