GridView in Android

in xml file:

< pre class="brush: java"< 
< ?xml version="1.0" encoding="utf-8"?> 
< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    > 
< GridView
    android:id="@+id/gridView1"
    android:numColumns="auto_fit"
    android:gravity="center"
    android:columnWidth="50dp"
    android:stretchMode="columnWidth"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" > 

< /GridView> 
< /LinearLayout> 

in java file:

public class Gridviewactivity extends Activity {
    GridView gridView;
    static final String[] numbers = new String[] {
            "A", "B", "C", "D", "E",
            "F", "G", "H", "I", "J",
            "K", "L", "M", "N", "O",
            "P", "Q", "R", "S", "T",
            "U", "V", "W", "X", "Y", "Z"};
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        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 arg0, View v, int position,long arg3)
            {
                Toast.makeText(getApplicationContext(),
                        ((TextView) v).getText()+ "at position"+position, Toast.LENGTH_SHORT).show();
            }
           
        });
        }}