Android 菜单(SubMenu)

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Android 菜单(SubMenu)

SubMenu（子菜单），是在选项菜单的基础上增加子菜单。

一个Menu对象可以拥有0或多个SubMenu，通过调用Menu.addSubMenu方法将SubMenu添加到当前Menu中。在SubMenu 添加MenuItem的方式和在Menu中添加MenuItem方式一样，因为SubMenu是Menu的子类，但是SubMenu里不能再添加 SubMenu。

Android提供了基于Group id管理多个MenuItem的方法。

removeGroup(int group)：移除所有属于group的MenuItem。

setGroupEnable( int group ,boolean enable)：批量开启或关闭整个组的MenuItem。

setGroupVisible( int group ,visible)：批量显示或隐藏整个组的MenuItem。

setGroupCheckable( int group ,boolean checkable,boolean exclusive)：设置菜单是否可选中。最后一个exclusive是指是单选还是多选，当exclusive是true时，系统将菜单前面添加单选框，是false时则变成是checkbox多选框。

示例：（在选项菜单[帮助]上配置了三个子菜单[LiveHelp,Email,Phone]）

效果图

Activity代码

      //定义选项菜单
    final private static int OPTION_MENU_HELP = 3;//菜单[帮助]的编号 
    final private static int OPTION_MENUS_GROUP0 = 0;//菜单组0#
    final private static int OPTION_MENUS_GROUP1 = 1;//菜单组1#
    final private static int OPTION_MENUS_GROUP2 = 2;//菜单组2#
    private MenuEntity[] optionMenus = {
    		new MenuEntity(OPTION_MENUS_GROUP0, 1, 1, "删除",android.R.drawable.ic_menu_delete),
    		new MenuEntity(OPTION_MENUS_GROUP0, 2, 2, "保存",android.R.drawable.ic_menu_edit),
    		new MenuEntity(OPTION_MENUS_GROUP0, 3, 3, "帮助",android.R.drawable.ic_menu_help),
    		new MenuEntity(OPTION_MENUS_GROUP0, 4, 4, "添加",android.R.drawable.ic_menu_add),
    		new MenuEntity(OPTION_MENUS_GROUP1, 5, 5, "详细",android.R.drawable.ic_menu_info_details),
    		new MenuEntity(OPTION_MENUS_GROUP1, 6, 6, "发送",android.R.drawable.ic_menu_send),
    		new MenuEntity(OPTION_MENUS_GROUP1, 7, 7, "电话",android.R.drawable.ic_menu_call),
    		new MenuEntity(OPTION_MENUS_GROUP1, 8, 8, "照相",android.R.drawable.ic_menu_camera),
    		};
    //定义选项菜单[帮助]的子菜单
    private MenuEntity[] helpSubMenus = {
    		new MenuEntity(OPTION_MENUS_GROUP2, 9, 1, "LiveHelp",android.R.drawable.ic_menu_delete),
    		new MenuEntity(OPTION_MENUS_GROUP2, 10, 2, "Email",android.R.drawable.ic_menu_edit),
    		new MenuEntity(OPTION_MENUS_GROUP2, 11, 2, "Phone",android.R.drawable.ic_menu_edit),
    		};

	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_list_view);
    }
	
	/**
	 * 读取选中点击的菜单
	 * @param index
	 * @return
	 */
	public String readOptionsMenu(int index){
		for(int i=0;i<optionMenus.length;i++){
			if(optionMenus[i].getItemId()==index) return optionMenus[i].getTitle().toString();
		}
		for(int i=0;i<helpSubMenus.length;i++){
			if(helpSubMenus[i].getItemId()==index) return helpSubMenus[i].getTitle().toString();
		}
		return "";
	}
	
	
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {//创建选项菜单
		for(MenuEntity menuEntity:optionMenus){
			if(OPTION_MENU_HELP==menuEntity.getItemId()){
				//菜单[帮助]增加子菜单
				SubMenu subMenu = menu.addSubMenu(menuEntity.getGroupId(), menuEntity.getItemId(), menuEntity.getOrder(), menuEntity.getTitle()).setIcon(menuEntity.getIconRes());
				for(MenuEntity subMenuEntity:helpSubMenus){
					subMenu.add(subMenuEntity.getGroupId(), subMenuEntity.getItemId(), subMenuEntity.getOrder(), subMenuEntity.getTitle()).setIcon(subMenuEntity.getIconRes());
				}
			}else{
				menu.add(menuEntity.getGroupId(), menuEntity.getItemId(), menuEntity.getOrder(), menuEntity.getTitle()).setIcon(menuEntity.getIconRes());
			}
		}
		return super.onCreateOptionsMenu(menu);
	}
	
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		int itemId = item.getItemId();
		Toast.makeText(context, "menu["+itemId+":"+item.getTitle()+"]被点击了", Toast.LENGTH_SHORT).show();
		return super.onOptionsItemSelected(item);
	}



	@Override
	public void onOptionsMenuClosed(Menu menu) {
		Toast.makeText(context, "OptionsMenu被关闭了", Toast.LENGTH_SHORT).show();
		super.onOptionsMenuClosed(menu);
	}

备注

       private MenuEntity[] optionMenus = {
    		new MenuEntity(OPTION_MENUS_GROUP0, 1, 1, "删除",android.R.drawable.ic_menu_delete),
    		new MenuEntity(OPTION_MENUS_GROUP0, 2, 2, "保存",android.R.drawable.ic_menu_edit),
    		new MenuEntity(OPTION_MENUS_GROUP0, 3, 3, "帮助",android.R.drawable.ic_menu_help),
    		new MenuEntity(OPTION_MENUS_GROUP0, 4, 4, "添加",android.R.drawable.ic_menu_add),
    		new MenuEntity(OPTION_MENUS_GROUP1, 5, 5, "详细",android.R.drawable.ic_menu_info_details),
    		new MenuEntity(OPTION_MENUS_GROUP1, 6, 6, "发送",android.R.drawable.ic_menu_send),
    		new MenuEntity(OPTION_MENUS_GROUP1, 7, 7, "电话",android.R.drawable.ic_menu_call),
    		new MenuEntity(OPTION_MENUS_GROUP1, 8, 8, "照相",android.R.drawable.ic_menu_camera),
    		};
    //定义选项菜单[帮助]的子菜单
    private MenuEntity[] helpSubMenus = {
    		new MenuEntity(OPTION_MENUS_GROUP2, 9, 1, "LiveHelp",android.R.drawable.ic_menu_delete),
    		new MenuEntity(OPTION_MENUS_GROUP2, 10, 2, "Email",android.R.drawable.ic_menu_edit),
    		new MenuEntity(OPTION_MENUS_GROUP2, 11, 2, "Phone",android.R.drawable.ic_menu_edit),
    		};

其中的

MenuEntity

参考关于菜单基础属性的实体类

附录一：调用方法 removeGroup(int group)

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {//创建选项菜单
		for(MenuEntity menuEntity:optionMenus){
			if(OPTION_MENU_HELP==menuEntity.getItemId()){
				//菜单[帮助]增加子菜单
				SubMenu subMenu = menu.addSubMenu(menuEntity.getGroupId(), menuEntity.getItemId(), menuEntity.getOrder(), menuEntity.getTitle()).setIcon(menuEntity.getIconRes());
				for(MenuEntity subMenuEntity:helpSubMenus){
					subMenu.add(subMenuEntity.getGroupId(), subMenuEntity.getItemId(), subMenuEntity.getOrder(), subMenuEntity.getTitle()).setIcon(subMenuEntity.getIconRes());
				}
			}else{
				menu.add(menuEntity.getGroupId(), menuEntity.getItemId(), menuEntity.getOrder(), menuEntity.getTitle()).setIcon(menuEntity.getIconRes());
			}
		}
		menu.removeGroup(OPTION_MENUS_GROUP1);//移除全部group为1的菜单
		return super.onCreateOptionsMenu(menu);
	}

如图所示：原group为1的菜单不显示了！

附录二：调用方法 setGroupEnabled( int group, boolean enabled )

关闭或者开启组为group的全部菜单。（关闭：enabled =false，菜单项变灰，不能点；开启：enabled =false，菜单项正常，可以点）

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {//创建选项菜单
		for(MenuEntity menuEntity:optionMenus){
			if(OPTION_MENU_HELP==menuEntity.getItemId()){
				//菜单[帮助]增加子菜单
				SubMenu subMenu = menu.addSubMenu(menuEntity.getGroupId(), menuEntity.getItemId(), menuEntity.getOrder(), menuEntity.getTitle()).setIcon(menuEntity.getIconRes());
				for(MenuEntity subMenuEntity:helpSubMenus){
					subMenu.add(subMenuEntity.getGroupId(), subMenuEntity.getItemId(), subMenuEntity.getOrder(), subMenuEntity.getTitle()).setIcon(subMenuEntity.getIconRes());
				}
			}else{
				menu.add(menuEntity.getGroupId(), menuEntity.getItemId(), menuEntity.getOrder(), menuEntity.getTitle()).setIcon(menuEntity.getIconRes());
			}
		}
		menu.setGroupEnabled(OPTION_MENUS_GROUP1, false);//关闭group为1的菜单
		return super.onCreateOptionsMenu(menu);
	}