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Xamarin Forms using Azure Hubs. Push notifications not showing on android when app is running/active

I followed the tutorial to add push notifications to a Xamarin Forms app. It works in iOS in all states: app not running or running in the background or active. For android I get the notifications when the app is not running or it's in the background but not when the app is active.
I am using:
Xamarin.Azure.NotificationHubs.Android 1.1.4.1. (1/28/2021)
Xamarin.Firebase.Messaging 122.0.0 (6/11/2021)
Heres in my code on Android:
public class MainActivity : FormsAppCompatActivity
{
internal static readonly string CHANNEL_ID = "xxxxxx";
const string NotificationHubConnectionString = "xxxxxx";
const string NotificationHubName = "xxxxxx";
protected override void OnCreate(Bundle bundle)
{
.
.
.
NotificationHub.SetListener(new AzureListener());
NotificationHub.Start(this.Application, NotificationHubName, NotificationHubConnectionString);
.
.
.
LoadApplication(new App());
}
}
public class AzureListener : Java.Lang.Object, INotificationListener
{
public void OnPushNotificationReceived(Context context, INotificationMessage message)
{
var intent = new Intent(context, typeof(MainActivity));
intent.AddFlags(ActivityFlags.ClearTop);
var pendingIntent = PendingIntent.GetActivity(context, 0, intent, PendingIntentFlags.OneShot);
var notificationBuilder = new NotificationCompat.Builder(context, MainActivity.CHANNEL_ID);
notificationBuilder.SetContentTitle(message.Title)
.SetSmallIcon(Resource.Drawable.icon_category_announcement)
.SetContentText(message.Body)
.SetAutoCancel(true)
.SetShowWhen(false)
.SetContentIntent(pendingIntent);
var notificationManager = NotificationManager.FromContext(context);
notificationManager.Notify(0, notificationBuilder.Build());
}
}
I followed the tutorial from Microsoft (1/12/2021):
https://learn.microsoft.com/en-us/azure/notification-hubs/xamarin-notification-hubs-push-notifications-android-gcm#set-up-notification-hubs-in-your-project
In the tutorial there seem to be an issue on step 11 and 12 because they talk about a class name from the previous tutorial but then they use the new class name and some instructions seem to be missing:
Add the following above your class declaration, and have your class inherit from Java.Lang.Object and implement the INotificationListener:
=> There is nothing above the class declaration
Add the following code inside MyFirebaseMessagingService class, to process messages that are received.
=> The class name is actually AzureListener
What am I missing? How can I make the push notification to show up when the app is running and active?
UPDATE:
I think I was kind of confused here thinking that this is the code that shows the notification when the app in not running or running in the background. It looks like this code has nothing to do with that. The notification is shown by the OS. This code is to handle/show the notification when the app is active in the foreground. So in that case I am ok with showing just an alert. I was able to make this work simply doing this:
public class AzureListener : Java.Lang.Object, INotificationListener
{
public void OnPushNotificationReceived(Context context, INotificationMessage message)
{
Device.BeginInvokeOnMainThread(() =>
{
Application.Current.MainPage.DisplayAlert(message.Title, message.Body, "OK");
});
}
}
I am still not sure why the first code does not show the notification when the app is running in the foreground but for now I am ok with the alert.

It might be because of the structure of the payload you are sending from Azure. Please try a payload similar to this it will work. I was also facing similar issues initially.
{
"to": "-------------Token--------------------",
"data": {
"title": "title",
"message": "message"
}
}
Please read the payload part for more details.
https://github.com/CrossGeeks/PushNotificationPlugin/blob/master/docs/AndroidCustomization.md
Similar Question
Resume App from a Firebase Notification is not working (Xamarin Forms)

Freshchat push notification via Firebase (Android)

I'm implementing a third part service in my app (FreshChat,a service that let you integrate an helpdesk in an app or website),and all is going fine,except for the push notifications for chats. Freshchat work via Firebase (And the firebase push notifications don't give problems) but freshat notifications don't work. I followed the official documentation of freshchat but there are deprecated methods and definitely don't work (I tryed a lot)
Here's the Firebase Cloud Messaging code:
public class FireBase extends FirebaseMessagingService {
#Override
public void onMessageReceived(RemoteMessage message) {
super.onMessageReceived(message);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, "channel_id")
.setContentTitle(message.getNotification().getTitle())
.setContentText(message.getNotification().getBody())
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setStyle(new NotificationCompat.BigTextStyle())
.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
.setSmallIcon(R.mipmap.ic_launcher)
.setAutoCancel(true);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notificationBuilder.build());
}
And the extract from FreshChat documentation:
7.1 Connecting Freshchat with FCM
If you haven’t already integrated FCM, do so by following the instructions here. After following FCM steps for integration, follow these 2 steps to connect Freshchat and FCM
Step 1. Send Registration TokenIn the app’s implementation of FirebaseInstanceIdService, send the token to Freshchat as follows
Java
#Override
public void onTokenRefresh() {
String token = FirebaseInstanceId.getInstance().getToken();
Freshchat.getInstance(this).setPushRegistrationToken(token);
}
Step 2 : Handle FCM MessageIn the app’s implementation of FirebaseMessagingService, pass the RemoteMessage object to Freshchat if it is a Freshchat notification.
Java
public void onMessageReceived(RemoteMessage remoteMessage) {
if (Freshchat.isFreshchatNotification(remoteMessage)) {
Freshchat.getInstance(this).handleFcmMessage(context, remoteMessage);
} else {
//Handle notifications with data payload for your app
}
}
I tryed to do it via the documentation,but simply don't work,can you help me? Thank you in advance!
Here' also the full FreshChat documentation: https://support.freshchat.com/support/solutions/articles/229319-freshchat-android-sdk-integration-steps

Try adding this in your default activity, it works for me.
FirebaseInstanceId.getInstance().getInstanceId()
.addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
#Override
public void onComplete(#NonNull Task<InstanceIdResult> task) {
if (!task.isSuccessful()) {
Log.e(TAG, "getInstanceId failed", task.getException());
return;
}
// Get new Instance ID token
String token = task.getResult().getToken();
Freshchat.getInstance(this).setPushRegistrationToken(token);
Log.e("Token", token.toString());
}
});
Hope this helps you. Happy coding!!

How to send push notification just only to UID User in Firebase?

I'm just using firebase, now I've managed to create user authentication and have a few push notification questions in the firebase.
Before I followed the tutorial here, and it worked I was very happy. But apparently after I logout and try push notification, I still still receive the notification.
So my question is also pretty much about push notifications, namely:
How to make the notification only enter when I'm logged in?
How do I target the notification with the registered UID only?
Is it necessary to make notifications from firebase, so it can't be as straightforward as an automatic chat application?
Here's the code I've made:
MyFirebaseInstanceldService.java
public class MyFirebaseInstanceldService extends FirebaseInstanceIdService {
#Override
public void onTokenRefresh() {
// Get updated InstanceID token.
String refreshedToken = FirebaseInstanceId.getInstance().getToken();
// If you want to send messages to this application instance or
// manage this apps subscriptions on the server side, send the
// Instance ID token to your app server.
sendRegistrationToServer(refreshedToken);
}
private void sendRegistrationToServer(String refreshedToken) {
}
}
MyFirebaseMessaginService.java
public class MyFirebaseMessagingService extends FirebaseMessagingService {
public MyFirebaseMessagingService() {
}
#Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
sendNotification(Objects.requireNonNull(remoteMessage.getNotification()).getBody());
}
private void sendNotification(String messageBody) {
Intent intent = new Intent(this, HotelManagementActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
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.rotarylogo);
notificationBuilder.setContentTitle("Rotary Barcode");
notificationBuilder.setContentText(messageBody);
notificationBuilder.setAutoCancel(true);
notificationBuilder.setSound(defaultSoundUri);
notificationBuilder.setContentIntent(pendingIntent);
NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
assert notificationManager != null;
notificationManager.notify(0, notificationBuilder.build());
}
}
If there is anything I still need to add, just say for the other code. I thank you very much for wanting to help me who is still a beginner.

How to make the notification only enter when I'm logged in?
You have to handle it in a way where the token that gets generated is paired to the user that successfully logs in, making sure that you handle the logout as well.
How do I target the notification with the registered UID only?
Depending on which server you are using, you could just pair the token to the UID of the user (I presume you are using Firebase Auth). For example, what we did in our app (we're using Firebase DB) was as soon as the user gets to the home screen (successfully signs in), we submit the token to the DB, where the key is the uid. This way, we can easily get the token by specifying the uid.
Is it necessary to make notifications from firebase, so it can't be as straightforward as an automatic chat application?
I'm not sure what you mean by this one.
In general, having 3 questions in a single post is not advised here in Stack Overflow. I would strongly suggest that moving forward that you split each question into their own post as much as possible.

App connected to FCM not receiving notification from AWS SNS

I've connected an Android app to Google Firebase Cloud Messaging service (FCM) following this guide,
and I've followed this answer to setup the connection between FCM & AWS SNS.
I could successfully receive message sent from FCM console but not from AWS SNS console.
The message delivery status logged on AWS showed SUCCESS for every message I've sent while no notification was shown on my device.
Is there a way to check what's going on?

I faced the exactly the same problem, message from Firebase with device token works but somehow message from SNS to Firebase is not delivered.
I did develop iOS app as well, and at that moment, just sending "brabra" delivered message to iOS. However, FCM only accepts particular message format to test it from AWS SNS console.
Here is the example format of successful delivery of message to Android through SNS and FCM.
{
"GCM": "{\"notification\": { \"body\": \"Sample message for Android endpoints\", \"title\":\"Hello world\" } }"
}
The point is that we have to amend to "notification", not "data", and should have body and title in the notification.

The problem here is that AWS SNS sends what Google calls data messages.
With FCM you can send two types of messages - notifications and data. Notifications get displayed automatically by FCM while data messages do not. More on this here: https://firebase.google.com/docs/cloud-messaging/concept-options
Data messages that come in from SNS still can be handled - even if your app is in the background - by extending FirebaseMessagingService and overriding it's onMessageReceived method. More on this here: https://firebase.google.com/docs/reference/android/com/google/firebase/messaging/FirebaseMessagingService
I assume you would want your AWS SNS messages to mimic the notifications experience, namely:
See them pop up when the app is in the background
Have your text displayed in the notification
When the app activates you want all of the messages cleared out from
the drawer
To achieve this you'll want to do three things.
Firstly - you'll want to start tracking if your app is currently visible or not. The details on how to reliably detect this you can find here: https://stackoverflow.com/a/18469643/96911
Secondly - you'll want to handle data messages from AWS SNS by posting a notification, but only when your app is in the background:
public class MyFirebaseMessagingService extends FirebaseMessagingService {
static protected int id = 0;
#Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
if (!MyApplication.isActivityVisible()) {
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this);
mBuilder.setContentTitle(getString(R.string.app_name))
.setSmallIcon(R.drawable.notification_icon);
String message = remoteMessage.getData().get("default");
mBuilder.setContentText(message);
Intent resultIntent = new Intent(this, MainActivity.class);
PendingIntent resultPendingIntent =
PendingIntent.getActivity(
this,
0,
resultIntent,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mNotificationManager.notify(id ++, mBuilder.build());
}
}
}
And lastly - you'll want to clear out all of the notifications from the drawer when the user clicks on one of them. Combined with the visibility tracking I linked just above the activity that responds to the notifications should have the following onResume method:
#Override
protected void onResume() {
super.onResume();
MyApplication.activityResumed();
NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mNotificationManager.cancelAll();
}
It's been a long time since you asked this question but it was so painful for me to get to the bottom of this I decided to answer anyway. I hope this helps you or somebody tearing their hair out trying to make this thing work (cause making iOS work was a breeze, sheesh).

You can use this video tutorial https://youtu.be/iBTFLu30dSg with English subtitles of how to use FCM with AWS SNS step by step and example of how to send push notifications from AWS console. It works well for me and I successfully received push notification from SNS console and from my code on the mobile device

Simply using this JSON format:
{
"GCM": "{ \"notification\": { \"body\": \"Sample message for Android endpoints\",\"title\": \"Sample message for Android endpoints\"}}"
}

To get the Data from AWS SNS Console follow the below step:
1) Add the Project in FCM and Use Legacy server key for AWS SNS.
2) Get the Device token by using the below code:
String deviceToken = FirebaseInstanceId.getInstance().getToken();
3) Implement the below code in your application
public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {
#Override
public void onTokenRefresh() {
String refreshedToken = FirebaseInstanceId.getInstance().getToken();
sendRegistrationToServer(refreshedToken);
}
private void sendRegistrationToServer(String token) {
// TODO: Implement this method to send token to your app server.
}
}
4) Override onMessageReceived() its invoke when notification is received:
public class AppFirebaseMessagingService extends FirebaseMessagingService {
static protected int id = 0;
#Override
public void onMessageReceived(RemoteMessage remoteMessage) {
//remoteMessage.getNotification().getBody()
if (remoteMessage.getData().get("default").length() > 0) {
Intent intent = new Intent(this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
Uri ringNotificationSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notifyBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("ApplicationName")
.setContentText(remoteMessage.getData().get("default"))
.setAutoCancel(true)
.setSound(ringNotificationSound)
.setContentIntent(pendingIntent);
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(id++, notifyBuilder.build());
}
}
}
When We get the Notification from AWS SNS Service then we use remoteMessage.getData().get("default") for reading the message from AWS.

Firebase(FCM) notifications not coming when android app removed from recent tray

I'm sending Firebase notifications through my own webservice with PHP like below.
$url = 'https://fcm.googleapis.com/fcm/send';
$fields = array(
'registration_ids' => $tokens,
'data' => $message
);
$headers = array(
'Authorization:key = SERVER_KEY ',
'Content-Type: application/json'
);
1.Notifications are coming when App is in Foreground and Background without any issues , But if I removed app from recent tray then notifications not coming , I must have to handle this any solution for this ? (like Whatsup notifications are showing all scenarios even I force stopped this app from settings)
2.Once I received notification , from "onMessageReceived" how to pass these message,body content to my Activity /Fragments?
3.In some cases I want to send notification to all , Instead of adding all tokens to array . any other way to handle like "send to ALL" something like that ?
public class MyFirebaseMessagingService extends FirebaseMessagingService {
private static final String TAG = "MsgService";
#Override
public void onMessageReceived(RemoteMessage remoteMessage) {
Log.d(TAG, "From: " + remoteMessage.getFrom());
Log.d(TAG, "Data Payload : " + remoteMessage.getData());
sendNotification(remoteMessage.getData().get("message"));
}
private void sendNotification(String messageBody) {
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);
Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("Firebase Push Notification")
.setContentText(messageBody)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notificationBuilder.build());
}
}
Failed devices: (Notifications are not coming after removed from Recent Tray)
MI Redmi Note 2 (5.0.2 Lollipop)
Huawei honor 5c (5.1.1 Lollipop)
Succeed devices: (Notifications are coming after removed from Recent Tray)
HTC One X (4.2 Jelly Bean)
Samsung galaxy grand prime (4.4 Kitkat)

1.Notifications are coming when App is in Foreground and Background without any issues , But if I removed app from recent tray then
notifications not coming , I must have to handle this any solution for
this ? (like Whatsup notifications are showing all scenarios even I
force stopped this app from settings)
As per your code you must be getting a null pointer exception on remoteMessage.getNotification().getBody() as you are not sending notification, instead you are sending data payload from your curl request. As per my personal experience, the issue you just mentioned is seen especially in Android Kitkat or below devices. On Lollipop or above Firebase push seems to work fine.
2.Once I received notification , from "onMessageReceived" how to pass these message,body content to my Activity /Fragments?
You can issue a Broadcast from onMessageReceived() and register a Braodcast Receiver in your Activity and send the data in your broadcast intent. Example code:
Activity
private BroadcastReceiver receiver;
#Overrride
public void onCreate(Bundle savedInstanceState){
// your oncreate code
IntentFilter filter = new IntentFilter();
filter.addAction("SOME_ACTION");
receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String message = intent.getStringExtra("message");
}
};
registerReceiver(receiver, filter);
}
#Override
protected void onDestroy() {
if (receiver != null) {
unregisterReceiver(receiver);
receiver = null
}
super.onDestroy();
}
FirebaseMessagingService
public class MyFirebaseMessagingService extends FirebaseMessagingService {
private static final String TAG = "MsgService";
#Override
public void onMessageReceived(RemoteMessage remoteMessage) {
Log.d(TAG, "From: " + remoteMessage.getFrom());
Log.d(TAG, "Notification Message Body: " + remoteMessage.getData());
Intent intent=new Intent();
intent.setAction("SOME_ACTION");
intent.putExtra("message", remoteMessage.getNotification().getBody());
sendBroadcast(intent);
}
}
3.In some cases I want to send notification to all , Instead of adding all tokens to array . any other way to handle like "send to ALL"
something like that ?
There is nothing like "Send to ALL" in Firebase API, the only way to do this is using Firebase Console which have its own issues to handle like white icon issue, and ripping the custom params of your notification.

I was having problem with FCM on exactly Mi Phone and Huawei phone as well! Turns out that it was not a problem with FCM or your app, but on their device level.
They have device level app settings that disable notifications or even wake lock, so onMessageReceived() is not fired when the message arrives. After I changed the settings (mainly allow notifications & disable battery optimisation for my app), everything works just fine!
Refer to Firebase cloud messaging not received when app in background.

This problem needs back-end implementation.
Let me discuss how I overcome this shortcoming.
We are aware of the Activity life-cycle. So upon destroy, I call a service from the back-end that unregisters my client token.
All incoming messages will now be queued for delivery since the token for target client is unregistered.
So upon bringing back the application, I call a back-end service that registers my client.
The back end now starts to sends messages from queue with the new client token for my device.