android submenu

 

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 existing Menu with addSubMenu(). This returns a SubMenu object (an extension ofMenu). You can then add additional items to this menu, with the normal routine, using the add() methods. For example:

public boolean onCreateOptionsMenu(Menu menu) {
  boolean result = super.onCreateOptionsMenu(menu);
  //设置子菜单的名称
  SubMenu fileMenu = menu.addSubMenu("File");
  SubMenu editMenu = 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");

  return result;
}