public class MyActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.your_activity_layout);
        .....
        MyCustomAdapter adapter = new MyCustomAdapter();
        .....
    }

    class MyCustomAdapter extends ArrayAdapter {
        // your adapter implementation.
    }
}

ListView view = (ListView)findViewById(R.id.listview);
view.setAdapter(new CustomArrayAdapter(getApplicationContext(), array));
view.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    startActivity(intent);

}
};

CustomArrayAdapter myAdapter= new CustomArrayAdapter(this, questions);
gv.setAdapter(myAdapter);

gv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
            myDbHelper.close();
            Intent i = new Intent("com.bgdroid.quizapp.ANSWER");
            startActivityForResult(i,0);
            // TODO Auto-generated method stub

            }
});