In this article, we will see how we can send a link in a push notification, and that when pressing that notification, it opens the link in the browser.

# Previously

We will start from what was seen in the tutorial on How to send Push Notifications:

We will use the same code we developed for that article.

# Types of notifications

The first thing is to understand the types of notifications, which are two, and have to do with the way Android handles reception:

For this example, we are going to add a field to the notification, the linkURL field. Upon receiving it, we will tell it that when pressed, it should open the browser with that value.

# Intent

We will use an Intent, a messaging object that allows requesting actions from other components, such as opening the browser.

Source: developer.android.com

This intent cannot be assigned to the automatic notification type; we must use the data type to dyamically customize it.

# Backend Server

We modify the enviarNotificacion.php file to receive the LINKURL field and send it in the data block of the JSON.

$datos["title"] = $titulo;
$datos["body"] = $mensaje;

if (isset($_POST['LINKURL'])) {
    $datos["linkurl"] = $_POST['LINKURL'];
}

$fields = array(
    'registration_ids' => $registration_ids,
    'data' => $datos,
    'direct_book_ok' => true
);

# Android Application

In the application, we draw the notification and add a PendingIntent to open the browser.

@Override
public void onMessageReceived(@NonNull RemoteMessage message) {
    String titulo = message.getData().get("title");
    String descripcion = message.getData().get("body");
    String linkUrl = message.getData().get("linkurl");

    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
        .setContentTitle(titulo)
        .setContentText(descripcion)
        .setAutoCancel(true)
        .setSmallIcon(R.drawable.ic_launcher_foreground)
        .setContentIntent(onClick(linkUrl));

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

Open Browser

private PendingIntent onClickAbrirNavegador(String linkUrl) {
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setData(Uri.parse(linkUrl));
    return PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_IMMUTABLE);
}

# Complete Code

You can download the complete code from this repository: https://github.com/unsimpledev/ProyectoNotificacionesLink