监听Android 的home键[转]

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：

    class HomeKeyEventBroadCastReceiver extends BroadcastReceiver {

        static final String SYSTEM_REASON = "reason";
        static final String SYSTEM_HOME_KEY = "homekey";//home key
        static final String SYSTEM_RECENT_APPS = "recentapps";//long home key
        
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
                String reason = intent.getStringExtra(SYSTEM_REASON);
                if (reason != null) {
                    if (reason.equals(SYSTEM_HOME_KEY)) {
                        // home key处理点
                        
                    } else if (reason.equals(SYSTEM_RECENT_APPS)) {
                        // long home key处理点
                    }
                }
            }
        }
    }

其次，生成且注册之

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