GridView is not getting refreshed

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http://stackoverflow.com – I have designed a code in which when user click on next button in grid then new bunch of images get loaded into the gridview. But the problem is that grid is not getting refreshed with new images though i am getting new image urls. public class UserPage extends Activity { GetResponse task = new GetResponse(0); public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.userpage); final GridView gridview = (GridView) findViewById(R.id.gridview); ImageAdapter ia = new ImageAdapter(this); gridview.setAdapter(ia); grid (HowTos)