Android自动提示控件AutoCompleteTextView

public class MainActivity extends Activity {
private AutoCompleteTextView autotext;
private ArrayAdapter arrayAdapter;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.test);

    autotext =(AutoCompleteTextView) findViewById(R.id.autotext);
    String [] arr={"aa","aab","aac"};
    arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1,arr);
    autotext.setAdapter(arrayAdapter);
  }

}