I am trying to update a recycler view, which I can update with a method in main activity, but I am trying to get to it from a notification button, which opens a broadcast receiver and manipulates data, but I need to call the method in main activity to update my recycler view. I am trying to do this from the recycler view. I only need to do it if the recycler view in main activity is on screen, I can do it from on resume just fine, just want to to update if main activity is on with recycler view active.

CodePudding user response：

You can use another broadcast to communicate with Main Activity and update notification when main activity is active

    // broadcast
    val br: BroadcastReceiver = object:BroadcastReceiver(){
        override fun onReceive(context: Context?, intent: Intent?) {
            if (intent?.action == UPDATE_DATA){
                // update recycler view
            }
        }
    }

    var UPDATE_DATA = "com.example.broadcast.UPDATE_DATA"

    override fun onResume() {
        super.onResume()
        val filter = IntentFilter(UPDATE_DATA).apply {
        }
        LocalBroadcastManager.getInstance(this).registerReceiver(br, filter)
    }

    override fun onPause() {
        LocalBroadcastManager.getInstance(this).unregisterReceiver(br)
        super.onPause()
    }

    // send broadcast from notification broadcast
    Intent().also { intent ->
        intent.action = "com.example.broadcast.MY_NOTIFICATION"
        intent.putExtra("data", "Nothing to see here, move along.")
        LocalBroadcastManager.getInstance(this).sendBroadcast(intent)
    }