CODEWITHSUNDEEP
javaandroidandroid-studioandroid-activity
rajesh karmaker
rajesh karmaker

Reputation: 64

How to send data from a class to an Activity in Android

I am implementing FCM(Firebase cloud messaging) for push notifications. I could get push notification from the server using my service class successfully. But, how do I send data(messages) from the service class to the activity?

Service.java

public class Service extends FirebaseMessagingService {

    private static final String TAG = "MyFirebaseMsgService";

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {

        sendNotification(remoteMessage.getNotification().getBody());
    }


    private void sendNotification(String messageBody) {

        Intent intent = new Intent(this, FCMActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
                PendingIntent.FLAG_ONE_SHOT);

        Uri defaultSoundUri =RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

        NotificationCompat.Builder notificationBuilder = new
                NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle("Firebase Push Notification")
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);
        notificationBuilder.setDefaults(Notification.DEFAULT_VIBRATE);
        notificationBuilder.setLights(Color.RED, 1000, 300);
        NotificationManager notificationManager =
                (NotificationManager)
                        getSystemService(Context.NOTIFICATION_SERVICE);

        notificationManager.notify(0, notificationBuilder.build());
    }
}

FCMActivity.java

public class FCMActivity extends AppCompatActivity {
    private TextView mTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fcm);

        mTextView = (TextView) findViewById(R.id.txt);
    }
}

Upvotes: 1

Views: 618

Answers (2)

maciekjanusz
maciekjanusz

Reputation: 4775

There are several options, among those are:

  1. Register a BroadcastReceiver inside your Activity with an IntentFilter for your custom action (action is just a String identifier for a broadcast message type), and send the broadcast from service using LocalBroadcastManager.getInstance().sendBroadcast(Intent intent) method

  2. Use an event bus, for example the very popular GreenRobot EventBus library. See https://github.com/greenrobot/EventBus#eventbus-in-3-steps for explanation.

Both of these options require registering and unregistering a listener / receiver inside your Activity, which is best done in onResume/onPause for events that should trigger UI changes.

Additionally, you can bind to the service from your Activity.

Upvotes: 3

Master Disaster
Master Disaster

Reputation: 759

You should use IBinder in your service and ServiceConnection in your Activity

Upvotes: 0

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