Android Back Home键监听

风流不在谈锋胜，袖手无言味最长。这篇文章主要讲述Android Back Home键监听相关的知识，希望能为你提供帮助。
Back键的监听对于Back键的监听比较容易,可以在多个系统回调处拦截,比如在activity的下列方法中都可以收到Back键按下的事件:

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@Override public void onBackPressed() { // super.onBackPressed(); //注释掉这行,back键不退出activityLog.i(LOG_TAG, "onBackPressed"); }@Override public boolean dispatchKeyEvent(KeyEvent event) { Log.i(LOG_TAG, "dispatchKeyEvent: keyCode -- " + event.getKeyCode()); return super.dispatchKeyEvent(event); }@Override public boolean onKeyDown(int keyCode, KeyEvent event) { Log.i(LOG_TAG, "onKeyDown: keyCode -- " + keyCode); switch (keyCode) { case KeyEvent.KEYCODE_BACK: Log.i(LOG_TAG, "KeyEvent.KEYCODE_BACK"); break; case KeyEvent.KEYCODE_MENU: Log.i(LOG_TAG, "KeyEvent.KEYCODE_MENU"); break; case KeyEvent.KEYCODE_HOME: Log.i(LOG_TAG, "KeyEvent.KEYCODE_HOME"); // 收不到 break; case KeyEvent.KEYCODE_APP_SWITCH: Log.i(LOG_TAG, "KeyEvent.KEYCODE_APP_SWITCH"); // 收不到 break; default: break; }return super.onKeyDown(keyCode, event); }

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Home键的广播监听对于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:

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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"); }} }}

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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:

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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); } }

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在Activity的onResume和onPause里面分别调用:

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

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当然也可以根据需要在其他合适的时机注册和注销.

【Android Back Home键监听】
android app全屏终极方案

/** * 隐藏虚拟按键，并且全屏 */ protected void hideBottomUIMenu() { //隐藏虚拟按键，并且全屏 if (Build.VERSION.SDK_INT > 11 & & Build.VERSION.SDK_INT < 19) { // lower api View v = this.getWindow().getDecorView(); v.setSystemUiVisibility(View.GONE); } else if (Build.VERSION.SDK_INT > = 19) { //for new api versions. View decorView = getWindow().getDecorView(); int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_FULLSCREEN; decorView.setSystemUiVisibility(uiOptions); } }private void showBottomUIMenu(){ //恢复普通状态 if (Build.VERSION.SDK_INT > 11 & & Build.VERSION.SDK_INT < 19) { // lower api View v = this.getWindow().getDecorView(); v.setSystemUiVisibility(View.VISIBLE); } else if (Build.VERSION.SDK_INT > = 19) { //for new api versions. View decorView = getWindow().getDecorView(); int uiOptions = View.SCREEN_STATE_OFF; decorView.setSystemUiVisibility(uiOptions); } }