Notification using Firebase and Android

Question

I am trying to make an android application where I receive notification using firebase. I followed resources available over the internet.

All I want to do is send notification from firebase, the message that I receive I want to display it in TextView in main activity.

Currently I am testing in an emulator. There are few problems that I am not able to resolve.

I am able to send notification from firebase but:

1. When the application is running in foreground I don't receive a notification in the android notification panel and nothing happens in the main activity too. That is the text in TextView does not change.
2. When the application is running in background I do receive the notification in android notification panel with message sent from firebase, clicking the notification main activity opens but the text in TextView does not change.

Firebase Messaging Service

public class VAFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = "VAFirebaseMessagingS";

    public VAFirebaseMessagingService() {}

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

        Log.d(TAG, "From: " + remoteMessage.getFrom());
        if(remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());
            sendNotification(remoteMessage.getData().get("text"));
        }

        if(remoteMessage.getNotification() != null) {
            Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
            sendNotification(remoteMessage.getNotification().getBody());
        }
    }

    private void sendNotification(String messageBody) {
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra(Intent.EXTRA_TEXT, messageBody);

        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);
        notificationBuilder.setSmallIcon(R.drawable.ic_stat_name);
        notificationBuilder.setContentTitle("PFIVA");
        notificationBuilder.setContentText(messageBody);
        notificationBuilder.setAutoCancel(true);
        notificationBuilder.setSound(defaultSoundUri);
        notificationBuilder.setContentIntent(pendingIntent);

        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(0, notificationBuilder.build());
    }
}

Main Activity

public class MainActivity extends AppCompatActivity {

    private TextView userFeedbackQuery;

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

        userFeedbackQuery = (TextView) findViewById(R.id.pfiva_user_feedback_query);

        final Intent intent = getIntent();
        if(intent.hasExtra(Intent.EXTRA_TEXT)) {
            String userFeedbackQueryText = intent.getStringExtra(Intent.EXTRA_TEXT);
            userFeedbackQuery.setText(userFeedbackQueryText);
        }
    }
}

Android Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="de.pfiva.mobile.voiceassistant">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".activities.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service android:name=".messaging.FirebaseInstanceService">
            <intent-filter>
                <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
            </intent-filter>
        </service>

        <service
            android:name=".messaging.VAFirebaseMessagingService"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT"/>
            </intent-filter>
        </service>

    </application>

</manifest>

Please can someone guide what is wrong here? How can i solve the above two problems.

Thanks

---

After suggestions i made the below changes in Messaging Service, basically added notification channel.

private void sendNotification(String messageBody) {
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra(Intent.EXTRA_TEXT, messageBody);

        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, CHANNEL_ID);
        notificationBuilder.setSmallIcon(R.drawable.ic_stat_name);
        notificationBuilder.setContentTitle("PFIVA");
        notificationBuilder.setContentText(messageBody);
        notificationBuilder.setPriority(NotificationCompat.PRIORITY_HIGH);
        notificationBuilder.setAutoCancel(true);
        notificationBuilder.setSound(defaultSoundUri);
        notificationBuilder.setContentIntent(pendingIntent);

        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        // Create the NotificationChannel, but only on API 26+ because
        // the NotificationChannel class is new and not in the support library
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, importance);
            notificationManager.createNotificationChannel(channel);
        }

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

Problem i face now is that when the app is running in background, i do receive notification in notification panel and clicking on it open main activity but the text in TextView is not updated.

Answer 1

Two ideas to solve your issue:

1. Have you register your VAFirebaseMessagingService in your AndroidManifest.xml:

2. Since Android 8, you must use an Notification Channel to send push notifications. Android