ArrayAdapter 를 확장하지 않고 GridView를 만들었는데 onItemSelected 콜백 메소드에서 
textView.setText(item[position]);  적용이 안됩니다. 책에선 OnItemSelectedListener 구현해서 했는데..왜안될까요.

public class GridTestActivity extends Activity implements OnItemSelectedListener {
 
String [] item = {"asd","asd","rfwf"};

TextView textView ;
GridView gridView ;
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        textView = (TextView) findViewById(R.id.txt);
        gridView = (GridView) findViewById(R.id.GridView01);
        
        ArrayAdapter<String> adapter = 
             new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, item); 
        gridView.setAdapter(adapter);
        gridView.setOnItemSelectedListener(this);
    }
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
textView.setText(item[position]);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
textView.setText("");
}
}

xml파일

<?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"
    >
<TextView  
    android:id="@+id/txt"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"/>
<GridView 
    android:id="@+id/GridView01"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:numColumns="auto_fit" />
</LinearLayout>


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