Android GridView with working code

package com.example.newapp; import java.util.Collections; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.widget.AbsoluteLayout; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.GridView; import android.widget.TextView; import android.widget.Toast; import android.widget.AdapterView.OnItemClickListener; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); AbsoluteLayout al = (AbsoluteLayout) findViewById(R.id.widget0); GridView gridView; final String[] numbers = new String[] { "P", "Q", "E", "T", "T", "K", "Z", "I", "Z", "O", "K", "M", "I", "M", "P", "H", "N", "O", "T", "E", "R", "O", "I", "B", "x"}; gridView = (GridView) findViewById(R.id.gridView1); ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, numbers); gridView.setAdapter(adapter); gridView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView parent, View v, int position, long id) { Toast.makeText(getApplicationContext(), ((TextView) v).getText(), Toast.LENGTH_SHORT).show(); } }); }