add topics, data payload and foreground notifications

Author: solygambas

Diff for: 20-egg-timer/README.md

@@ -2,9 +2,9 @@
 
 A timer app for cooking eggs, using notifications and Firebase Cloud Messaging.
 
-<!-- <p align="center">
+<p align="center">
 <img src="screenshot.png" style="width:528px;max-width: 100%;">
-</p> -->
+</p>
 
 ## Features
 
@@ -15,7 +15,7 @@ A timer app for cooking eggs, using notifications and Firebase Cloud Messaging.
 - adding quick actions to make the notification interactive.
 - turning off notification badges.
 - pushing messages to the user via Firebase Cloud Messaging.
-- transfering data from a backend to the app.
+- transferring data from a backend to the app.
 
 Based on 2 tutorials by Google Codelabs (2022):
 

Diff for: 20-egg-timer/app/src/main/java/com/example/android/eggtimernotifications/MyFirebaseMessagingService.kt

@@ -35,12 +35,18 @@ class MyFirebaseMessagingService : FirebaseMessagingService() {
         // Not getting messages here? See why this may be: https://goo.gl/39bRNJ
         Log.d(TAG, "From: ${remoteMessage?.from}")
 
-        // TODO Step 3.5 check messages for data
+        // Step 3.5 check messages for data
         // Check if message contains a data payload.
+        remoteMessage?.data?.let {
+            Log.d(TAG, "Message data payload: " + remoteMessage.data)
+        }
 
-
-        // TODO Step 3.6 check messages for notification and call sendNotification
+        // Step 3.6 check messages for notification and call sendNotification
         // Check if message contains a notification payload.
+        remoteMessage?.notification?.let {
+            Log.d(TAG, "Message Notification Body: ${it.body}")
+            sendNotification(it.body as String)
+        }
 
     }
     // [END receive_message]
@@ -61,7 +67,7 @@ class MyFirebaseMessagingService : FirebaseMessagingService() {
      * @param token The new token.
      */
     private fun sendRegistrationToServer(token: String?) {
-        // TODO: Implement this method to send token to your app server.
+        // Optional: Implement this method to send token to your app server.
     }
 
     /**

Diff for: 20-egg-timer/app/src/main/java/com/example/android/eggtimernotifications/ui/EggTimerFragment.kt

@@ -62,6 +62,9 @@ class EggTimerFragment : Fragment() {
             getString(R.string.breakfast_notification_channel_name)
         )
 
+        // call subscribe topics on start
+        subscribeTopic()
+
         return binding.root
     }
 
@@ -92,6 +95,18 @@ class EggTimerFragment : Fragment() {
         // Step 1.6 END create a channel
     }
 
+    // subscribe to breakfast topic
+    private fun subscribeTopic() {
+        FirebaseMessaging.getInstance().subscribeToTopic(TOPIC)
+            .addOnCompleteListener { task ->
+                var msg = getString(R.string.message_subscribed)
+                if (!task.isSuccessful) {
+                    msg = getString(R.string.message_subscribe_failed)
+                }
+                Toast.makeText(context, msg, Toast.LENGTH_SHORT).show()
+            }
+    }
+
     companion object {
         fun newInstance() = EggTimerFragment()
     }