Android捕获home和recent app按键

Android开发中，有时候需要捕获home和recent app按键，进行相应处理。可以通过注册如下广播接收器：

PRivate BroadcastReceiver mHomeKeyEventReceiver = new BroadcastReceiver() {        String SYSTEM_REASON = "reason";        String SYSTEM_HOME_KEY = "homekey";        String SYSTEM_RECENT_APPS = "recentapps";                 @Override          public void onReceive(Context context, Intent intent) {            String action = intent.getAction();            if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {            Log.d(TAG, "ACTION_CLOSE_SYSTEM_DIALOGS");                String reason = intent.getStringExtra(SYSTEM_REASON);                Log.d(TAG, "reason - " + reason);                if (TextUtils.equals(reason, SYSTEM_HOME_KEY)) {                     // Home key is pressed                                    }else if( TextUtils.equals(reason, SYSTEM_RECENT_APPS) ){                    // Recent apps key.                 }            }        }    };其中，intent中的extra信息SYSTEM_REASON，表示的即是按下的按键，SYSTEM_HOME_KEY表示按下的事HOME键，SYSTEM_RECENT_APPS表示按下的是recent app键。