Get intent data from FCM Notification in Fragment without clicking on the notification

When my app receives a notification with a data payload, it arrives in the system tray and I can click the notification to receive the data in my launcher activity, which I can then pass on to my Fragment:

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {   
        // Notification data
        val user2 = intent?.extras?.getString("user2")
        val intent = Intent(this, HomeActivity::class.java)
        intent.putExtra("user2", user2)
        startActivity(intent)
        return finish()

However, if a notification comes through and the user opens the app without clicking on the notification, it bypasses MainActivity and goes directly to the Fragment. This means I can't intercept the intent data from the notification.

Is there another way I can access the notification data from my Fragment?

One solution is to store the data in shared preference or sqlite db depending on your requirment, in onMessageReceived, and if you want onMessageRecieved irrespective of app is in foreground or backgroun, then instead of sending notification message too user always send data message to user and show show notification using NotificationBuilder instead of default FCM notification, this way you'll always have data in local persistence.

override fun onMessageReceived(remoteMessage: RemoteMessage) {
        val sp = applicationContext.getSharedPreferences("NOTIFICATION_SHARED_PREFERENCE",Context.MODE_PRIVATE)
        val editor = sp.edit()
        editor.putString("data",remoteMessage.data.toString())
        editor.commit()

        val pendingIntent:PendingIntent = PendingIntent.getActivity(this,Random().nextInt(),intent,0)
        showNotification(remoteMessage.data["title"]!!,remoteMessage.data["body"]!!,pendingIntent)
}

    private fun showNotification(title:String,description: String,pendingIntent: PendingIntent){
        val icon =  R.drawable.ic_notification
        val notification = NotificationCompat.Builder(this, CHANNEL_ID)
            .setSmallIcon(icon)
            .setContentTitle(title)
            .setContentText(description)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setGroup(GROUP_KEY_PUSH_MESSAGES)
            .setContentIntent(pendingIntent)
            .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
            .setAutoCancel(true)
            .build()


        NotificationManagerCompat.from(applicationContext).apply {
            notify(Random().nextInt(),notification)
        }
    }

and you can access the data directly in fragment using following method, no need to pass data to fragment from activity.

            val sp = applicationContext.getSharedPreferences("NOTIFICATION_SHARED_PREFERENCE",Context.MODE_PRIVATE)
            val type = object : TypeToken<HashMap<String,String>>() {}.type
            val data:HashMap<String,String> = Gson().fromJson(sp.getString("data",""),type)
            intent.putExtra("user2",data["user2"])//use the prefered key