🚧
Note
Before running your app on device:

Make sure your Android devices have at least Android 4.4 and the Google Play Store app installed

If you are using an emulator, set it to run Android 4.4 with Google APIs.

Step 1: Create a Firebase Project and Register your App

Before you can add Firebase to your Android app, you need to create a Firebase project to connect to your Android app:

In the Firebase console, click on Add project
To add the Firebase resources to an existing Google Cloud project, enter its project name or select it from the dropdown menu
To create a new project, enter the desired project name. You can also optionally edit the project ID displayed below the project name
Click on Create project Create project (or Add Firebase, if you're using an existing Google Cloud project)

To use Firebase in your Android app, you need to register your app with your Firebase project. Registering your app is often called "adding" your app to your project:

Go to the Firebase console
In the center of the project overview page, click the Android icon (plat_android) or Add app to launch the setup workflow
Enter your app's package name in the Android package name field
Click Register app

📘
Optional
You may also enter other app information such as App nickname and Debug signing certificate SHA-1 in the steps above

Step 2 : Configure your App with Firebase (FCM)

Download and then add the Firebase Android configuration file (google-services.json) to your app:

Click Download google-services.json to obtain your Firebase Android config file.
Move your config file into the module (app-level) root directory of your app.

📘
Note
For values in your google-services.json config file to be accessible to the Firebase SDKs, you will need the Google services Gradle plugin (google-services)

In your root-level (project-level) Gradle file (<project>/build.gradle.kts or <project>/build.gradle), add the Google services plugin as a dependency:

plugins { id("com.android.application") version "7.3.0" apply false  // ...  
**// Add the dependency for the Google services Gradle plugin**
id("com.google.gms.google-services") version "4.4.0" apply false
}

In your module (app-level) Gradle file (usually <project>/<app-module>/build.gradle.kts or <project>/<app-module>/build.gradle), add the Google services plugin:

plugins { id("com.android.application")  
 **// Add the Google services Gradle**
 plugin id("com.google.gms.google-services")
}

In your module (app-level) Gradle file (usually <project>/<app-module>/build.gradle.kts or <project>/<app-module>/build.gradle), add the dependencies for the Firebase products that you want to use in your app. We recommend using the Firebase Android BoM to control library versioning.

dependencies 
{  
**// Import the Firebase BoM implementation(platform("com.google.firebase:firebase-bom:32.7.1"))**  // When using the BoM, you don't specify versions in Firebase library dependencies 
**// Add the dependency for the Firebase SDK for Firebase Cloud Messaging(FCM)**  
implementation("com.google.firebase:firebase-messaging")
**// TODO: Add the dependencies for Firebase products you want to use**  // See https://firebase.google.com/docs/android/setup#available-libraries  
//For example, add the dependencies for Firebase Authentication and Cloud Firestore 
implementation("com.google.firebase:firebase-auth") implementation("com.google.firebase:firebase-firestore")  
}

Step 3 : Integrate Firebase Messaging (FCM) in the app code

a) Edit the app manifest

Add the following to your app's manifest:

A service that extends FirebaseMessagingService. This is required if you want to do any message handling beyond receiving notifications in the background. To receive notifications when the app is foregrounded, to receive a data payload, to send upstream messages, etc. extending this service is indispensable.

<service  
  android:name=".fcm.MyFirebaseMessagingService"  
  android:exported="false">  
	<intent-filter>
		 <action android:name="com.google.firebase.MESSAGING_EVENT" />  
	</intent-filter>
</service>

(Optional) you can also add the below lines to the app manifest, if you wish to customise the icon or the colour of incoming notifications:

<!-- Set custom default icon. This is used when no icon is set for incoming notification messages. -->  
<meta-data  android:name="com.google.firebase.messaging.default_notification_icon"
android:resource="@drawable/ic_stat_ic_notification"  />  
<!-- Set color used with incoming notification messages. This is used when no color is set for the incoming  
     notification message. -->  
<meta-data  android:name="com.google.firebase.messaging.default_notification_color"
android:resource="@color/colorAccent"  />

From Android 8.0 (API level 26) and higher, Notification Channels are supported and recommended. FCM provides a default notification channel with basic settings. If you prefer to Create and use your own default channel, set default_notification_channel_id to the ID of your notification channel object as shown

<meta-data  android:name="com.google.firebase.messaging.default_notification_channel_id"  
android:value="@string/default_notification_channel_id"  />

b) Request runtime notification permission on Android 13+

📘
Note
Android 13 introduced a new runtime permission for showing notifications. This affects all apps running on Android 13 or higher that use FCM notifications.

By default, the FCM SDK (version 23.0.6 or higher) includes the POST_NOTIFICATIONS permission defined in the manifest. However, your app will also need to request the runtime version of this permission via the constant, android.permission.POST_NOTIFICATIONS. Your app will not be allowed to show notifications until the user has granted this permission.

To request the new runtime permission:

// Declare the launcher at the top of your Activity/Fragment:  
private  val requestPermissionLauncher = registerForActivityResult(  ActivityResultContracts.RequestPermission(),)
{ isGranted:  Boolean  ->  if  (isGranted)  
{  
// FCM SDK (and your app) can post notifications.  
}  
else  
{  // TODO: Inform user that that your app will not show notifications.  
}  
}  
  
private  fun askNotificationPermission()  {
  // This is only necessary for API level >= 33 (TIRAMISU)  
  if  (Build.VERSION.SDK_INT >=  Build.VERSION_CODES.TIRAMISU)  
  {  
  if  (ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS)  ==  PackageManager.PERMISSION_GRANTED )  
  {  
  // FCM SDK (and your app) can post notifications.  
  }  
  else  if  (shouldShowRequestPermissionRationale(Manifest.permission.POST_NOTIFICATIONS))  
  {  // TODO: display an educational UI explaining to the user the features that will be enabled  
  //       by them granting the POST_NOTIFICATION permission. This UI should provide the user  
  //       "OK" and "No thanks" buttons. If the user selects "OK," directly request the permission.  
  //       If the user selects "No thanks," allow the user to continue without notifications.  
  }  else  
  {  
  // Directly ask for the permission requestPermissionLauncher.launch(Manifest.permission.POST_NOTIFICATIONS)  
  }  
  }  
}

c) Retrieve the current registration token

When you need to retrieve the current token, call FirebaseMessaging.getInstance().getToken() in your Activity/Fragment:

Firebase.messaging.token.addOnCompleteListener(  
    OnCompleteListener { task ->  
  if (!task.isSuccessful) {  
            Log.w(TAG, "Fetching FCM registration token failed", task.exception)  
            return@OnCompleteListener  
  }  
  
  // Get new FCM registration token  
  val token = task.result  
  
  // Log and toast  
  val msg = getString(R.string.msg_token_fmt, token)  
        Log.d(TAG, msg)  
  
   //Implement this method to send token to your app server.  
  Log.d("MainActivity" ,"sendRegistrationTokenToServer($token)")  
 })

d) Monitor token generation

The onNewToken callback fires whenever a new token is generated.

/**  
 * Called if the FCM registration token is updated. This may occur if the security of * the previous token had been compromised. Note that this is called when the * FCM registration token is initially generated so this is where you would retrieve the token. */
 override fun onNewToken(token: String) {  
	Log.d(TAG, "Refreshed token: $token")  
  
 // If you want to send messages to this application instance or  
 // manage this apps subscriptions on the server side, send the // FCM registration token to your app server. 
 sendRegistrationToServer(token)  
}

👍
That's it!
Your app is ready to receive push notifications using FCM!

How to Integrate Firebase Cloud Messaging (FCM) in Android

🚧
Note

Step 1: Create a Firebase Project and Register your App

📘
Optional

Step 2 : Configure your App with Firebase (FCM)

📘
Note

Step 3 : Integrate Firebase Messaging (FCM) in the app code

a) Edit the app manifest

b) Request runtime notification permission on Android 13+

📘
Note

c) Retrieve the current registration token

d) Monitor token generation

👍
That's it!

🚧Note

Step 1: Create a Firebase Project and Register your App

📘Optional

Step 2 : Configure your App with Firebase (FCM)

📘Note

Step 3 : Integrate Firebase Messaging (FCM) in the app code

a) Edit the app manifest

b) Request runtime notification permission on Android 13+

📘Note

c) Retrieve the current registration token

d) Monitor token generation

👍That's it!

🚧
Note

📘
Optional

📘
Note

📘
Note

👍
That's it!