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 existingMenuwithaddSubMenu(). This returns aSubMenuobject (an extension ofMenu). You can then add additional items to this menu, with the normal routine, using theadd()methods. For example:

Code:
  1. publicbooleanonCreateOptionsMenu(Menumenu){
  2. booleanresult=super.onCreateOptionsMenu(menu);
  3. //设置子菜单的名称
  4. SubMenufileMenu=menu.addSubMenu("File");
  5. SubMenueditMenu=menu.addSubMenu("Edit");
  6. //按对应的名称增加子菜单
  7. fileMenu.add("new");
  8. fileMenu.add("open");
  9. fileMenu.add("save");
  11. editMenu.add("undo");
  12. editMenu.add("redo");
  14. returnresult;
  15. }

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