CODEWITHSUNDEEP
androidgreenrobot-eventbus
Juha
Juha

Reputation: 439

android EventBus as LocalBroadcastManager replacement

greenrobot EventBus has been suggested as replacement of (now deprecated) LocalBroadcastManager. I'm current using LocalBroadcastManager to send intents from service to MainActivity like this:

val intent = Intent("service event")
intent.flags = Intent.FLAG_ACTIVITY_SINGLE_TOP or Intent.FLAG_ACTIVITY_CLEAR_TOP
intent.putExtra("param", "some value")
LocalBroadcastManager.getInstance(this).sendBroadcast(intent)

That clears the stack and MainActivity becomes visible as the only activity in the stack.

How can I achieve the same (Intent.FLAG_ACTIVITY_SINGLE_TOP or Intent.FLAG_ACTIVITY_CLEAR_TOP) effect when posting EventBus event?

Upvotes: 0

Views: 1393

Answers (1)

Juha
Juha

Reputation: 439

After some experiments, I found a "solution":

  1. Register EventBus in onCreate() of MainActivity EventBus.getDefault().register(this). That makes it possible for MainActivity to receive posts even when it is not on top of the activity stack. Then, of course, unregister in onDestroy().
  2. In MainActivity event receiver function, start MainActivity again with Intent.FLAG_ACTIVITY_SINGLE_TOP or Intent.FLAG_ACTIVITY_CLEAR_TOP flags, for example like this:
    @Subscribe(threadMode = ThreadMode.MAIN_ORDERED)
    fun onEventReceived(event: BusEvent) {
        val i = Intent(applicationContext, MainActivity::class.java)
        i.flags = Intent.FLAG_ACTIVITY_SINGLE_TOP or Intent.FLAG_ACTIVITY_CLEAR_TOP
        i.putExtra("action", event.action)
        i.putExtra("params", event.params)
        startActivity(i)
    }

I'm new to this and better solutions are appreciated.

Upvotes: 1

Related Questions