android之【事件监听器】

public class ActivityListener extends Activity
  implements OnClickListener
{
  EditText show;
  Button bn;
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    show = (EditText)findViewById(R.id.show);
    bn = (Button)findViewById(R.id.bn);
    //直接使用Activity作为事件监听器
    bn.setOnClickListener(this);
  }

  //实现事件处理方法
  @Override
  public void onClick(View v)
  {
    // TODO Auto-generated method stub
    show.setText("bn按钮被单击了！");
  }
}