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);  }}