android编程之menu按键功能实现方法

package com.test_menu;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.*;
import android.widget.*;;
public class test_menu extends Activity {
 public static final int ITEM0 = Menu.FIRST;
 public static final int ITEM1 = Menu.FIRST + 1;
 private TextView text;
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  text = (TextView)findViewById(R.id.textView1);
 }
 @Override
 public boolean onCreateOptionsMenu(Menu menu)
 {
  super.onCreateOptionsMenu(menu);
  menu.add(0,ITEM0,0,"button1");
  menu.add(0,ITEM1,0,"button2");
  menu.findItem(ITEM1);
  return true;
 }
 public boolean onOptionsItemSelected(MenuItem item)
 {
  switch (item.getItemId())
  {
  case ITEM0:
  {
   text.setText("第1个按键");
   break;
  }
  case ITEM1:
  {
   text.setText("第2个按键");
   break;
  }
  }
  return super.onOptionsItemSelected(item);
 }
}