XAMARIN Infinite Scrolling ListView using android Blank App

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

The following ListActivity shows a list of integers, starting with 40, adding items when the user scrolls to the end of the list.

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 view,
int firstVisible, int visibleCount, int totalCount) {
boolean loadMore = /* maybe add a padding */
firstVisible + visibleCount >= totalCount;
if(loadMore) {
adapter.count += visibleCount; // or any other amount
adapter.notifyDataSetChanged();
}
}
public void onScrollStateChanged(AbsListView v, int s) { }
class Aleph0 extends BaseAdapter {
int count = 40; /* starting amount */
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;
}
}
}

You should obviously use separate threads for long running actions (like loading web-data) and might want to indicate progress in the last list item (like the market or gmail apps do).

2 Replies

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Logesh Palani8y ago
One solution is to implement an OnScrollListener and make changes (like adding items, etc.) to the ListAdapter at a convenient state in its onScroll method.

The following ListActivity shows a list of integers, starting with 40, adding items when the user scrolls to the end of the list.
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 view,

        int firstVisible, int visibleCount, int totalCount) {



        boolean loadMore = /* maybe add a padding */

            firstVisible + visibleCount >= totalCount;



        if(loadMore) {

            adapter.count += visibleCount; // or any other amount

            adapter.notifyDataSetChanged();

        }

    }



    public void onScrollStateChanged(AbsListView v, int s) { }



    class Aleph0 extends BaseAdapter {

        int count = 40; /* starting amount */



        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;

        }

    }

}

You should obviously use separate threads for long running actions (like loading web-data) and might want to indicate progress in the last list item (like the market or gmail apps do).
ROHIT SHARMA9y ago
please help me for this
???