android - Open specific Activity when notification clicked in FCM

Question

I am working on App in which I am required to show notification. For notification, i am using FireBase Cloud Messaging (FCM). I am able to get Notification when app is in background.

But when I click on notification, it redirect to home.java page. I want it to redirect to Notification.java page.

So,please tell me how to specify Activity in on Click of notification. I am using two services:

1.)MyFirebaseMessagingService

2.)MyFirebaseInstanceIDService

This is my code sample for onMessageReceived() method in MyFirebaseMessagingService class.

public class MyFirebaseMessagingService extends FirebaseMessagingService {

private static final String TAG = "FirebaseMessageService";
Bitmap bitmap;


public void onMessageReceived(RemoteMessage remoteMessage) {



    Log.d(TAG, "From: " + remoteMessage.getFrom());

    // Check if message contains a data payload.
    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());
    }

    // Also if you intend on generating your own notifications as a result of a received FCM
    // message, here is where that should be initiated. See sendNotification method below.
}
/**
 * Create and show a simple notification containing the received FCM message.
 */

private void sendNotification(String messageBody, Bitmap image, String TrueOrFalse) {
    Intent intent = new Intent(this, Notification.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

    intent.putExtra("Notification", TrueOrFalse);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
            PendingIntent.FLAG_ONE_SHOT);

    Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
            .setLargeIcon(image)/*Notification icon image*/
            .setContentTitle(messageBody)
            .setStyle(new NotificationCompat.BigPictureStyle()
             .bigPicture(image))/*Notification with Image*/
            .setAutoCancel(true)
            .setSound(defaultSoundUri)
            .setContentIntent(pendingIntent);

    NotificationManager notificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}

/*
*To get a Bitmap image from the URL received
* */
public Bitmap getBitmapfromUrl(String imageUrl) {
    try {
        URL url = new URL(imageUrl);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap bitmap = BitmapFactory.decodeStream(input);
        return bitmap;

    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return null;

    }
}

Answer 1

With FCM, you can send two types of messages to clients:

1. Notification messages: sometimes thought of as "display messages."

FCM automatically displays the message to end-user devices on behalf of the client app. Notification messages have a predefined set of user-visible keys.

2. Data messages: which are handled by the client app.

Client app is responsible for processing data messages. Data messages have only custom key-value pairs.

According to FCM document Receive Messages in an Android App

• Notifications delivered when your app is in the background. In this case, the notification is delivered to the device’s system tray. A user tap on a notification opens the app launcher by default.
• Messages with both notification and data payload, both background and foreground. In this case, the notification is delivered to the
  device’s system tray, and the data payload is delivered in the extras of the intent of your launcher Activity.

Set click_action in the notification payload:

So, if you want to process the messages arrived in the background, you have to send click_action with message.

click_action is a parameter of the notification payload

If you want to open your app and perform a specific action, set click_action in the notification payload and map it to an intent filter in the Activity you want to launch.

For example, set click_action to OPEN_ACTIVITY_1 to trigger an intent filter like the following:

<intent-filter>
  <action android:name="OPEN_ACTIVITY_1" />
  <category android:name="android.intent.category.DEFAULT" />
</intent-filter>

FCM payload looks like below:

{
  "to":"some_device_token",
  "content_available": true,
  "notification": {
      "title": "hello",
      "body": "test message",
      "click_action": "OPEN_ACTIVITY_1"
  },
  "data": {
      "extra":"juice"
  }
}