android submenu
16lz
2021-01-23
Submenus
A sub menu can be added within any menu, except another sub menu. These are very useful when your application has a lot of functions that may be organized in topics, like the items in a PC application's menu bar (File, Edit, View, etc.).
A sub menu is created by adding it to an existingMenu
with
. This returns aaddSubMenu()
SubMenu
object (an extension ofMenu
). You can then add additional items to this menu, with the normal routine, using the
methods. For example:add()
- publicbooleanonCreateOptionsMenu(Menumenu){
- booleanresult=super.onCreateOptionsMenu(menu);
- //设置子菜单的名称
- SubMenufileMenu=menu.addSubMenu("File");
- SubMenueditMenu=menu.addSubMenu("Edit");
- //按对应的名称增加子菜单
- fileMenu.add("new");
- fileMenu.add("open");
- fileMenu.add("save");
- editMenu.add("undo");
- editMenu.add("redo");
- returnresult;
- }
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