Android - 收到推送通知 FCM 后如何更新活动中的数据或 UI？

Question

FirebaseMessagingService当我收到推送通知并且应用程序位于前台时，我有以下工作正常：

public class _FCMService extends FirebaseMessagingService {
   @Override
   public void onMessageReceived(RemoteMessage remoteMessage) {
      if (remoteMessage.getData().size() > 0) {
         // Log.i(TAG, "PUSH PAYLOAD: " + remoteMessage.getData());

         JSONObject pushData = new JSONObject(remoteMessage.getData());
         pushType = pushData.optString("pushType");
         pushMessage = pushData.optString("body");
         Log.i(TAG, "ON PUSH RECEIVED - pushType: " + pushType);
         Log.i(TAG, "ON PUSH RECEIVED - pushMessage: " + pushMessage);


         Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
         NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                 .setContentText(pushMessage)
                 .setStyle(new NotificationCompat.BigTextStyle())
                 .setAutoCancel(true)
                 .setSmallIcon(R.mipmap.ic_launcher)
                 .setSound(defaultSoundUri);
         NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
         assert notificationManager != null;
         notificationManager.notify(0 , notificationBuilder.build());
      }
   }



   @Override
   public void onNewToken(@NotNull String token) {
      Log.i(TAG, "Refreshed token: " + token);
      ANDROID_DEVICE_TOKEN = token;
   }
}

因此，如果我收到推送，Logcat 会打印出通知的正文和（如果存在）字符串pushType。

我需要做的是在收到推送时使我的其他活动更新数据，并获取pushMessage和pushType字符串。

我知道如何在 iOS Swift 中做到这一点 - 通过使用NotificationCenter- 但不知道 Android，我尝试过LocalBroadcaster，但没有成功。

Answer 1

LocalBroadcastManager现已弃用！

LiveData您可以在静态引用中使用实现并在Activity或中观察它Fragment

public class NotificationService extends FirebaseMessagingService {

    @Override
    public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
        
        Notification.
                    getInstance().
                    addOrder(remoteMessage.getData().get("id"));
        
    }

    public static class Notification {
        private static Notification instance;
        private MutableLiveData<String> newOrder;

        private Notification() {
            newOrder = new MutableLiveData<>();
        }

        public static Notification getInstance() {
            if(instance == null){
                instance = new Notification();
            }
            return instance;
        }

        public LiveData<String> getNewOrder() {
            return newOrder;
        }

        public void addOrder(String orderID){
            newOrder.postValue(orderID);
        }
    }
}

并在Activity或中Fragment：

NotificationService.
   Notification.
       getInstance().
       getNewOrder().
       observe(getViewLifecycleOwner(), new Observer<String>() {
           @Override
           public void onChanged(String s) {
               //TODO: update your ui here...
           }
       });