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])
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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); }
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group为1的菜单项变灰了