Android 如何使用FirebaseMessagingService计算通知数？

我正在开发一个使用Firebase的通知推送的系统。我的问题是，当用户单击通知时，我需要计算通知的数量并重置计数器（“contador”变量）

计数器的功能是显示下一条消息：“有X个新警报”

在用户第一次收到通知后，此计数器不会递增，并且始终仅显示1个通知，但可能会有更多通知

代码如下：

public class MiFirebaseMessagingService extends FirebaseMessagingService {

   NotificationCompat.Builder mBuilder;

   int mNotificationId = 1234567;

   String titulo = "";

   int contador = 0;

   JSONArray alertas = new JSONArray();

  public static final String TAG = "NOTICIAS";

   @Override
   public void onMessageReceived(RemoteMessage remoteMessage) {
       super.onMessageReceived(remoteMessage);

       String from = remoteMessage.getFrom();

       Log.d(TAG, "Mensaje recibido de: "+from);

       if(remoteMessage.getNotification() != null) {
           Log.d(TAG, "Notificacion: " + remoteMessage.getNotification().getBody());
           Log.d(TAG, "Zona:" + remoteMessage.getData().get("Zona").toString());

           contador++;
           Log.d(TAG, "Contador:" + contador);

           String cuerpo = "Se han detectado ".concat(String.valueOf(contador)).concat(" nuevas alarmas");
           titulo = titulo.concat(remoteMessage.getNotification().getTitle()).concat(",");

           JSONObject alerta_actual = new JSONObject();
           try {
               alerta_actual.put("Variable", remoteMessage.getNotification().getTitle().toString());
               alerta_actual.put("Descripcion", remoteMessage.getNotification().getBody().toString());
               alerta_actual.put("Zona", remoteMessage.getData().get("Zona").toString());
               Log.d(TAG, "Alerta:" + alerta_actual.toString());

               alertas.put(alerta_actual);

               if(remoteMessage.getData().size() > 0)
               {
                   Log.d(TAG, "Data:"+remoteMessage.getData());
               }

               mostrarNotificacion(cuerpo);

        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

另一方面，向用户显示带有计数器的消息的代码如下：

private void mostrarNotificacion(String body) {

    Log.d(TAG, alertas.toString());
    Log.d(TAG, "Contador:"+String.valueOf(contador));

    NotificationManager mNotifyMgr = (NotificationManager) getApplicationContext().getSystemService(NOTIFICATION_SERVICE);

    int icono = R.mipmap.ic_launcher;
    Intent i = new Intent(this, Notificaciones.class);
    i.putExtra("Alertas", alertas.toString());

    int uniqueInt = (int) (System.currentTimeMillis() & 0xfffffff);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, uniqueInt, i, PendingIntent.FLAG_UPDATE_CURRENT);

    mBuilder = new NotificationCompat.Builder(getApplicationContext())
            .setContentIntent(pendingIntent)
            .setSmallIcon(icono)
            .setContentTitle(titulo)
            .setContentText(body)
            .setContentIntent(pendingIntent)
            .setAutoCancel(true);

    mNotifyMgr.notify(1, mBuilder.build());
}

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为什么计数器“contador”在第一次之后没有增加？

它每次在类的新实例上初始化，您应该将其存储在shaedPreferences中。如果每次在类的新实例上初始化，您应该将其存储在shaedPreferences中