在Activity中添加选项菜单

public class MainActivity extends Activity{
    private static final int ITEM1 = Menu.FIRST;
    private static final int ITEM2 = Menu.FIRST+1;
    
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);   //mian是activity的界面文件
        }

    //重写
    public boolean onCreateOptionsMenu(Menu menu){
       menu.add(0,ITEM1,0,"开始");
       menu.add(0,ITEM2,0,"退出");
    }

    public boolean onOptionsItemSelected(MenuItem item){
       switch(item.getItemId()){
      case ITEM1:
setTitle("开始");
break;
case ITEM2:
setTitle("退出");
break;
}
return true;
}
}