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); }}