invalidateOptionsMenu（）无法正常工作

Question

我想在每次从一个信号通知类收到新通知时更新我的​​android应用程序上的通知计数徽章。流程是，每当收到新通知时，我都会将计数保存到sharedpreference。它已经完成并且每次收到通知时，计数徽章都会更新，问题是使用无效选项菜单更新工具栏中的图标。 所以我在MainActivity类中创建了此方法

public void updateNotif(){
    HashMap<String, Integer> notif = notif_count.getCount();
    count = notif.get(NotifCountSession.KEY_COUNT);
    Log.e(MainActivity.class.getSimpleName(), "COUNT : "+count);
    invalidateOptionsMenu();
}

然后在如下所示的OneSignal通知类中调用它

public class Notification implements OneSignal.NotificationReceivedHandler {

private NotifCountSession session;

private Application app;
private int count;
public Notification(Application app){
    this.app = app;
}

@Override
public void notificationReceived(OSNotification notification) {

    init();
    count++;
    session.saveCount(count);
//this code works
    Log.e(MainActivity.class.getSimpleName(), "COUNT NOTIF : "+count);
//but this one not
    new MainActivity().updateNotif();
}

private void init(){
    session = new NotifCountSession(app);
    HashMap<String, Integer> notif = session.getCount();
    count = notif.get(session.KEY_COUNT);
}
}

下面是我的通知计数标志

如何解决这个问题？

Answer 1

请按照以下步骤从通知中进行更新。

1）添加您的MainActivity

private BroadcastReceiver mMyBroadcastReceiver;

然后，

2）在onResume

@Override
protected void onResume() {
    super.onResume();
    mMyBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            updateNotif();
        }
    };
    try {
        LocalBroadcastManager.getInstance(this).registerReceiver(mMyBroadcastReceiver, new IntentFilter("your_action"));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

//和您的其他代码

3）然后在onPause中注销

@Override
protected void onPause() {
    super.onPause();


LocalBroadcastManager.getInstance(this).unregisterReceiver(mMyBroadcastReceiver);
}

4）最后，在您的notificationReceived方法中

Intent intent = new Intent("your_action");  
LocalBroadcastManager localBroadcastManager =LocalBroadcastManager.getInstance(this);
localBroadcastManager.sendBroadcast(intent);