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Android Push Notifications

After a regular configuration of the FCM on your project. Retrieve the Firebase token and set with the setFirebaseToken(Context context, String token) from the Grouplink class.


  FirebaseMessaging.getInstance().getToken()
    .addOnCompleteListener(new OnCompleteListener<String>() {
      @Override
      public void onComplete(@NonNull Task<String> task) {
        if (!task.isSuccessful()) {
          Log.w(TAG, "Fetching FCM registration token failed", task.getException());
          return;
        }

        // Get new FCM registration token
        String token = task.getResult();
        Context context = MainActivity.this;
        // Log and toast
        String msg = getString(R.string.msg_token_fmt, token);
        Log.d(TAG, msg);
        //Set the Firebase Token in the grouplink sdk.
        Grouplink.setFirebaseToken(context, token);
        Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
      }
  });

The Firebase Token must be monitored, because it changes periodically. Do the same to the after a token is renewed.

/**
 * There are two scenarios when onNewToken is called:
 * 1) When a new token is generated on initial app startup
 * 2) Whenever an existing token is changed
 * Under #2, there are three scenarios when the existing token is changed:
 * A) App is restored to a new device
 * B) User uninstalls/reinstalls the app
 * C) User clears app data
 */
override fun onNewToken(token: String) {
    Log.d(TAG, "Refreshed token: " + token)
    //Set the Firebase Token in the grouplink sdk.
    Grouplink.setFirebaseToken(context, token)
    super.onNewToken(token)
}

Configuring RemoteMessages reception from Firebase​

To config Grouplink Regular Notifications in foreground, it is needed to config the notification reception from FCM.

1. Get the Notification from the notification inside the RemoteMessage.​

Full FirebaseMessagingService extension implementation result:​

import android.util.Log
import com.google.firebase.messaging.FirebaseMessagingService
import com.google.firebase.messaging.RemoteMessage
import com.grouplink.marketdemo.notification.NotificationManager
import com.grouplink.marketdemo.notification.NotificationManager.Companion.createNotificationChannelVisible
import com.grouplinknetwork.GroupLink
import java.util.*

class FirebaseService : FirebaseMessagingService() {

    override fun onMessageReceived(message: RemoteMessage) {

        /*
        * To show a notification with the app in foreground, please override
        * this method, and build a new Notification from the RemoteMessage
        * received.
        */

        super.onMessageReceived(message)
    }

    override fun onNewToken(token: String) {
        GroupLink.setFirebaseToken(applicationContext, token)
        //Create the notification channel as soon as possible,
        //to be able to receive notifications.
        createNotificationChannelVisible(this)
        super.onNewToken(token)
    }
}

Adding meta-data for Custom Notification Channel​

To configure a custom Notification Channel for firebase notifications, please add the following lines:

<application>
    .
    .
    .

    <meta-data
        android:name="com.google.firebase.messaging.default_notification_channel_id"
        android:value="@string/default_notification_channel_id"/>
    <meta-data
        android:name="com.google.firebase.messaging.default_notification_icon"
        android:resource="@drawable/ic_gl_alarm" />
    <meta-data
        android:name="com.google.firebase.messaging.default_notification_color"
        android:resource="@color/gl_blue" />

</application>