How to handle the fire base notification when app

问题:

I have integrated Fire base cloud messaging with my application. When I was sending notification from firebase console, If app is in background/not opened then I am receiving notification,

but unable to receive notification when app is in foreground/open

all suggestions are appreciated.

回答1:

When app is in foreground,notifications are not generated themselves.you need to write some additional code.when message is received onMessagereceived method is called where you can generate the notification.here is the code:

public class MyFirebaseMessagingService extends FirebaseMessagingService {
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    super.onMessageReceived(remoteMessage);
    Log.d("msg", "onMessageReceived: " + remoteMessage.getData().get("message"));
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
        String channelId = "Default";
        NotificationCompat.Builder builder = new  NotificationCompat.Builder(this, channelId)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle("test")
                .setContentText(remoteMessage.getNotification().getBody()).setAutoCancel(true).setContentIntent(pendingIntent);;
        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(channelId, "Default channel", NotificationManager.IMPORTANCE_DEFAULT);
            manager.createNotificationChannel(channel);
        }
        manager.notify(0, builder.build());
}

}

回答2:

FirebaseMessagingService never work when the app is in foreground. In this case if you want to receive the message from FCM then WakefulBroadcastReceiver will work for you

public class FirebaseDataReceiver extends WakefulBroadcastReceiver {


        @Override
        public void onReceive(Context context, Intent intent) {

            Log.d("BroadcastReceiver::", "BroadcastReceiver");
            NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setContentTitle(intent.getExtras().getString("title"))
                    .setContentText(intent.getExtras().getString("message"));
            NotificationManager manager = (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
            manager.notify(0, builder.build());
        }
    }

Link firebase with GCM in play store and write the below code in manifest

<receiver
    android:name=".firebase.FirebaseDataReceiver"
    android:exported="true"
    android:permission="com.google.android.c2dm.permission.SEND">
    <intent-filter>
        <action android:name="com.google.android.c2dm.intent.RECEIVE" />
    </intent-filter>
</receiver>