Android ListView Refresh Single Row

by

As Romain Guy explained a while back during the Google I/O session, the most efficient way to only update one view in a list view is something like the following (this one update the whole view data):

ListView list = getListView();
int start = list.getFirstVisiblePosition();
for(int i=start, j=list.getLastVisiblePosition();i<=j;i++)
    if(target==list.getItemAtPosition(i)){
        View view = list.getChildAt(i-start);
        list.getAdapter().getView(i, view, list);
        break;
    }

Assuming target is one item of the adapter.

This code retrieve the ListView, then browse the currently shown views, compare the target item you are looking for with each displayed view items, and if your target is among those, get the enclosing view and execute the adapter getView on that view to refresh the display.

As a side note invalidate doesn’t work like some people expect and will not refresh the view like getView does, notifyDataSetChanged will rebuild the whole list and end up calling getview for every displayed items and invalidateViews will also affect a bunch.

One last thing, one can also get extra performance if he only needs to change a child of a row view and not the whole row like getView does. In that case, the following code can replace list.getAdapter().getView(i, view, list); (example to change a TextView text):

((TextView)view.findViewById(R.id.myid)).setText("some new text");

In code we trust.

More Related Contents:

  1. Android Recyclerview vs ListView with Viewholder
  2. Android Listview slow down scroll speed
  3. How to stop EditText from gaining focus when an activity starts in Android?
  4. How to implement endless list with RecyclerView?
  5. How to implement Android Pull-to-Refresh
  6. Should we use RecyclerView to replace ListView? [closed]
  7. Android ListView Divider
  8. How to implement getfilter() with custom adapter that extends baseadapter
  9. Xamarin.Forms ListView: Set the highlight color of a tapped item
  10. How to test the performance of an Android application?
  11. Replace one Fragment with another in ViewPager
  12. how to customize listview row android
  13. Android Alternate row Colors in ListView
  14. Android – ListView – performItemClick
  15. How to detect android cpu speed?
  16. ListView items are not clickable. why?
  17. Listview itemclick not work
  18. Android save Checkbox State in ListView with Cursor Adapter
  19. Passing a List from one Activity to another
  20. Layout_width of a ListView
  21. Logcat error: “addView(View, LayoutParams) is not supported in AdapterView” in a ListView
  22. Buggy ListView makes me sad
  23. Sort listview with array adapter
  24. How to Overlap items in LinearLayoutManager – RecyclerView (like stacking cards)
  25. Android ListView with delete button
  26. Remove the bottom divider of an android ListView
  27. Placing ViewPager as a row in ListView
  28. How to get selected list items from a Listview with checkBox and Custom Adapter?
  29. Recycling views in a listview, worth it?
  30. Android Click on listItem checks wrong checkbox

Leave a Comment