Pass data with PendingIntent and retrieve with onNewIntent when app launches

Question

I have an Android application which will receive push notification. The notification have wearable support hence the notification will also be visible in Android wear with action button.

I am looking to pass data when the notification reaches onMessageReceived in FirebaseMessagingService class. Tried setting data in Intent and passed that with Pending Intent.

val intent = Intent(this, MainActivity::class.java)
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
        intent.data = Uri.parse("12345")
        intent.putExtra("user_id", "USER ID")
        intent.putExtra("date", "DATE")
        val pendingIntent = PendingIntent.getActivity(
            applicationContext,
            System.currentTimeMillis().toInt() , intent,
            0
        )
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationChannel =
                NotificationChannel(CHANNEL_ID,
                    CHANNEL_NAME,
                    CHANNEL_IMPORTANCE)
            val notificationManager =
                this.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            notificationManager.createNotificationChannel(notificationChannel)

            val notificationBuilder =  NotificationCompat.Builder(this,CHANNEL_ID)
                .setContentTitle(getString(R.string.app_name))
                .setContentText(body)
                .setAutoCancel(true)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentIntent(pendingIntent)
                .extend(NotificationCompat.WearableExtender()
                    .addAction(NotificationCompat.Action(R.drawable.icon,
                        "Explore",
                        pendingIntent))
                )
            notificationManager.notify(0, notificationBuilder.build())
        }

When click on the notification from Wear, capturing the intent in onNewIntent to get the data passed. But couldn't find the data which were passed.

override fun onNewIntent(intent: Intent?) {
    super.onNewIntent(intent)
    setIntent(intent)
    // intent.getStringExtra("date")
    // intent.extras.getString("date")
    // intent.extras.get("date")
    // intent.data
}

Couldn't get the data. Is there any way to get the intent passed with the pending intent ? Or how to get the values passed with Pending Intent.

Answer 1

My assumption is that onNewIntent() is not being called.

If you specify FLAG_ACTIVITY_CLEAR_TOP and your app is already running and there is an instance of MainActivity in the task stack, Android will remove the existing instance of MainActivity and create a new one. The Intent with "extras" will then be delivered in onCreate() and onNewIntent() will not be called.

If your app is not running, tapping the notification will start your app and create a new instance of MainActivity and the Intent with the "extras" will be delived in onCreate() and onNewIntent() will not be called.

Also, since the Intent that you put in the PendingIntent will be used by Android to launch an Activity from a non-Activity context, you need to specify Intent.FLAG_ACTIVITY_NEW_TASK.

Also, you should always specify FLAG_UPDATE_CURRENT when getting a PendingIntent with "extras", because if you do not, you may get an existing PendingIntent with some old "extras" or maybe none at all. Using FLAG_UPDATE_CURRENT will ensure that your Intent "extras" are copied into the PendingIntent even if it already exists. Like this:

val intent = Intent(this, MainActivity::class.java)
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
                    Intent.FLAG_ACTIVITY_CLEAR_TOP)
    intent.data = Uri.parse("12345")
    intent.putExtra("user_id", "USER ID")
    intent.putExtra("date", "DATE")

val pendingIntent = PendingIntent.getActivity(
        applicationContext,
        System.currentTimeMillis().toInt() , intent,
        PendingIntent.FLAG_UPDATE_CURRENT
    )