CODEWITHSUNDEEP
androidkotlinandroid-recyclerviewscrollviewlistener
user2638180
user2638180

Reputation: 1023

ScrollViewChangeListener not working as expected

I've defined the following code, so if an user is on top of the scrollview a swiperefreshlayout works. 

recyclerView.getViewTreeObserver().addOnScrollChangedListener(ViewTreeObserver.OnScrollChangedListener {
        if (recyclerView.scrollY == 0) {
            binding.refreshed!!.isEnabled = true
        } else {
            binding.refreshed!!.isEnabled = false
        }

    })

But this code only reacts first time I move the recyclerview (which, by the way is in position 0 at start, and considers it to be at position 0 when move is performed), rest of the time the listener is never fired.

What may I be doing wrong?

PD: It's possible to achieve the wanted behavior with this code:

   val layoutManager = LinearLayoutManager(this.context);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.getViewTreeObserver().addOnScrollChangedListener(ViewTreeObserver.OnScrollChangedListener {


            if (layoutManager.findFirstCompletelyVisibleItemPosition() == 0) {
                binding.refreshed!!.isEnabled = true
            } else {
                binding.refreshed!!.isEnabled = false
            }
        })

Upvotes: 0

Views: 143

Answers (1)

Ankit
Ankit

Reputation: 1068

you can try this to get top position on recyclerview

 LinearLayoutManager layoutManager = new LinearLayoutManager(this);
    recyclerView.setLayoutManager(layoutManager);
    if(layoutManager.findFirstCompletelyVisibleItemPosition()==0) {
         binding.refreshed!!.isEnabled = true
    }
    else {
          binding.refreshed!!.isEnabled = false
    }

Upvotes: 1

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