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Jul
28
2010

  •   5  down vote accepted 
          

    One solution is to implement an OnScrollListener and make changes (like adding items, etc.) to the ListAdapter at a convenient state in its onScrollStateChanged method.

      

    The following ListActivity shows a list of integers, starting with 40, adding 10 per scroll-stop.

  • public class Test extends ListActivity implements OnScrollListener {
            Aleph0 adapter = new Aleph0();

            protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
            setListAdapter    (adapter);
            getListView    ().setOnScrollListener(this);
            }

            public void onScroll(AbsListView v, int i, int j, int k) { }

            public void onScrollStateChanged(AbsListView v, int state) {
                if(state == OnScrollListener.SCROLL_STATE_IDLE) {
                    adapter    .count += 10;
                    adapter    .notifyDataSetChanged();
                }
            }

            class Aleph0 extends BaseAdapter {
                int count = 40;

                public int getCount() { return count; }
                public Object getItem(int pos) { return pos; }
                public long getItemId(int pos) { return pos; }

                public View getView(int pos, View v, ViewGroup p) {
                        TextView view = new TextView(Test.this);
                    view    .setText("entry " + pos);
                        return view;
                }
            }
    }
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