转自：here
常常需要监听android HOME键，当HOME键下压时，往往需要做一些状态保存，音效停止等操作，那么如何做，才能监听到HOME键呢？我们知道HOME是系统键，app中无法通过onKey这些函数来处理。要妥善的处理HOME键，首先需要看看HOME键下压时，系统做了些什么。
二、app中对于HOME键广播事件的接收
首先，自定义一个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处理点 15 16 } else if (reason.equals(SYSTEM_RECENT_APPS)) { 17 // long home key处理点 18 } 19 } 20 } 21 } 22 }
其次，生成且注册之
1 receiver = new HomeKeyEventBroadCastReceiver(); 2 registerReceiver(receiver, new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));