監聽Android 的home鍵[轉]

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轉自：here

常常需要監聽android HOME鍵，當HOME鍵下壓時，往往需要做一些狀態儲存，音效停止等操作，那麼如何做，才能監聽到HOME鍵呢？我們知道HOME是系統鍵，app中無法通過onKey這些函數來處理。要妥善的處理HOME鍵，首先需要看看HOME鍵下壓時，系統做了些什麼。

二、app中對於HOME鍵廣播事件的接收

      首先，自訂一個BroadcastReceiver：

 1     class HomeKeyEventBroadCastReceiver extends BroadcastReceiver { 2  3         static final String SYSTEM_REASON = "reason"; 4         static final String SYSTEM_HOME_KEY = "homekey";//home key 5         static final String SYSTEM_RECENT_APPS = "recentapps";//long home key 6          7         @Override 8         public void onReceive(Context context, Intent intent) { 9             String action = intent.getAction();10             if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {11                 String reason = intent.getStringExtra(SYSTEM_REASON);12                 if (reason != null) {13                     if (reason.equals(SYSTEM_HOME_KEY)) {14                         // home key處理點15                         16                     } else if (reason.equals(SYSTEM_RECENT_APPS)) {17                         // long home key處理點18                     }19                 }20             }21         }22     }

其次，產生且註冊之

1         receiver = new HomeKeyEventBroadCastReceiver();2         registerReceiver(receiver, new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));