Adding items to ListView, maintaining scroll position and NOT seeing a scroll jump

Question

I\'m building an interface similar to the Google Hangouts chat interface. New messages are added to the bottom of the list. Scrolling up to the top of the list will trigger a lo

Answer 1

I was breaking up my head until I found a solution similar to this. Before adding a set of items you have to save top distance of the firstVisible item and after adding the items do setSelectionFromTop().

Here is the code:

// save index and top position
int index = mList.getFirstVisiblePosition();
View v = mList.getChildAt(0);
int top = (v == null) ? 0 : v.getTop();

// for (Item item : items){
    mListAdapter.add(item);
}

// restore index and top position
mList.setSelectionFromTop(index, top);

It works without any jump for me with a list of about 500 items :)

I took this code from this SO post: Retaining position in ListView after calling notifyDataSetChanged