FireBase Cloud Messaging Service的onMessageReceived上未显示Toast

Question

我使用以下代码制作Log，Toast并从onMessageReceived发送广播到服务。

我可以在日志中看到使用Firebase控制台发送的数据。但是Toast没有显示，Broadcast也没有发送。

代码如下：

class MyFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = "MyFirebaseMsgService";

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {

        Log.d(TAG, "From: " + remoteMessage.getFrom());
        Toast.makeText(getApplicationContext(),"From: " + remoteMessage.getFrom(),Toast.LENGTH_SHORT).show();

        if (remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());

        }

        // Check if message contains a notification payload.
        if (remoteMessage.getNotification() != null) {
            Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
            Toast.makeText(getApplicationContext(),"Toast shown",Toast.LENGTH_LONG).show();
            Intent i = new Intent();
            i.setAction("firebase.message.combinedthings");
            sendBroadcast(i);
        }
    }
}

Answer 1

由于未在主线程上执行onMessageReceived（）代码，因此未显示Toast。要显示Toast，您应该在UI线程上执行该调用：

    Handler handler = new Handler(Looper.getMainLooper());
    handler.post(new Runnable() {
      public void run() {
        Toast.makeText(getApplicationContext(), "Toast on UI thread", Toast.LENGTH_SHORT).show();
      }
    });

我遇到了同样的麻烦，希望对您有所帮助。