如何在android中检测到应用被用户关闭？

public class AppClosedReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
            String reason = intent.getStringExtra("reason");
            if (reason != null && reason.equals("homekey")) {
                // 应用被用户按下Home键关闭
                // 在这里处理相应的逻辑
            } else if (reason != null && reason.equals("recentapps")) {
                // 应用被用户按下多任务键关闭
                // 在这里处理相应的逻辑
            }
        }
    }
}

<receiver android:name=".AppClosedReceiver">
    <intent-filter>
        <action android:name="android.intent.action.CLOSE_SYSTEM_DIALOGS" />
    </intent-filter>
</receiver>

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