Android中OptionMenu用法实例

package com.yyl;
import Android.app.Activity;
import Android.os.Bundle;
import Android.view.Menu;
import Android.view.MenuItem;
public class MenuDemoActivity extends Activity {
  public static final int EIGHT_ID = Menu.FIRST+1;
  public static final int SIXTEEN_ID = Menu.FIRST+2;
  public static final int TWENTY_FOUR_ID = Menu.FIRST+3;
  public static final int TWO_ID = Menu.FIRST+4;
  public static final int THIRTY_TWO_ID = Menu.FIRST+5;
  public static final int FORTY_ID = Menu.FIRST+6;
  public static final int ONE_ID = Menu.FIRST+7;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
  }
  //创建OptionsMenu
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    this.populateMenu(menu);
    return super.onCreateOptionsMenu(menu);
  }
   //单击事件
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    int itemId = item.getItemId();   
    System.out.println(itemId);
    return super.onOptionsItemSelected(item);
  }
  private void populateMenu(Menu menu) {
    menu.add(Menu.NONE, ONE_ID, Menu.NONE, "1 Pixel");
    menu.add(Menu.NONE, TWO_ID, Menu.NONE, "2 Pixels");
    menu.add(Menu.NONE, EIGHT_ID, Menu.NONE, "8 Pixels");
    menu.add(Menu.NONE, SIXTEEN_ID, Menu.NONE, "16 Pixels");
    menu.add(Menu.NONE, TWENTY_FOUR_ID, Menu.NONE, "24 Pixels");
    menu.add(Menu.NONE, THIRTY_TWO_ID, Menu.NONE, "32 Pixels");
    menu.add(Menu.NONE, FORTY_ID, Menu.NONE, "40 Pixels");
    }
  @Override
  public boolean onMenuItemSelected(int featureId, MenuItem item) {
    //得到点击的菜单项的ID（此Id是自己设定的）
    int itemId = item.getItemId();
    if(ONE_ID == itemId)
    {
      System.out.println("您选择了 1 Pixel 菜单");
    }
    return super.onMenuItemSelected(featureId, item);
  }
}