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I basically populate a ListView lv with an ArrayAdapter and I need to programatically lv.smoothScrollToPosition(i) only after it's rendered; otherwise, it will not work. The event I'm listening to is onWindowFocusChanged(boolean hasFocus) to set the adapter to the listview.

How can I catch the moment at which is optimal to scroll the lv?

Jorge
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3 Answers3

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I think you can work around for your situation. Using Handler, after you call notifyDataSetChanged or set adapter to your listview, you can use: 

final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
      @Override
      public void run() {
        //Do something after 200ms
        lv.smoothScrollToPosition(i);
      }
    }, 200);
RoShan Shan
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  • I complemented the solution with this answer and http://stackoverflow.com/a/3035521/2422833 – Jorge Mar 28 '17 at 20:04
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try judge position in getView method;

public @NonNull View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

Letty
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This can be done using overriden function getView in your ArrayAdapter. You can check if position is equal to the no of items in your list.

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ...
    ...
    ...
    if(position == yourList.size() - 1) {
       //do your work
       //it's better to make interface handle this call inside your Activity
    }
}

Hope it helps

Waqas Ahmed Ansari
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  • Here, the number of times it iterates only match the number of items rendered (which I don't know in advance), not the size of the list. – Jorge Mar 28 '17 at 18:09