Android using EventBus not updating another view after posting

Question

I need to send a data from fragment B to A and add items to the Recyclerview inside of the Fragment A, so I'm using the EventBus to send the data and updating the list, the problem is, it only works in Debugging line by line, I mean, step by step and its weird.

So in the Fragment with the RecyclerView I register the Event and call the fragment.

override fun onStart() {
    super.onStart()
    if(!EventBus.getDefault().isRegistered(this)){
        EventBus.getDefault().register(this)
    }
}

 @Subscribe(threadMode = ThreadMode.ASYNC)
 fun onMessageEvent(event: TEvent?) {
    adapter?.addItems(event?.model!!);
    adapter?.notifyDataSetChanged();
}

The Adapter :

fun addItems(model: SubCategoryModel){
    dataM.run {
        add(model)
        if(dataM.isNotEmpty()){
            text.visibility = View.GONE;
            imageView.visibility = View.GONE;
        }
    }
}

Fragment B where I fill the form with the information

EventBus.getDefault().post(TEvent(model))
activity?.onBackPressed()

Before using the EventBus I was using a Dialog in the same Fragment and it worked but now, it only updates the list if the app is running in a debug mode.

How can I update the other fragment thread ?

I was using onStop but it was removing as soon as the new fragment opens — Nathiel Paulino, Feb 17 '21 at 21:15

Rajan Kali · Answer 1 · 2021-02-17T21:50:37.550

0

I think you should update UI from MAIN threadMode instead of ASYNC

@Subscribe(threadMode = ThreadMode.MAIN)
fun onMessageEvent(event: TEvent?) {
     adapter?.addItems(event?.model!!);
     adapter?.notifyDataSetChanged();
}

UPDATE

May be swapping the post statement

activity?.onBackPressed() // makes receiver fragment start
EventBus.getDefault().post(TEvent(model))

edited Feb 17 '21 at 21:50

answered Feb 17 '21 at 20:01

Rajan Kali

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maybe because the addItem runs dataM.run {} – Nathiel Paulino Feb 17 '21 at 21:16
try swapping the statements as mentioned in updated answer – Rajan Kali Feb 17 '21 at 21:50
same problem. . – Nathiel Paulino Feb 18 '21 at 09:47
Any Suggestions ? – Nathiel Paulino Feb 19 '21 at 05:54
same issue, anyone got solution? – Amin Pinjari Mar 29 '22 at 08:05

Android using EventBus not updating another view after posting

1 Answers1