子菜單(Submenu), 使用addSubMenu().

子菜單(sub menu)可以添加在任何菜單(menu)，除了另一個子菜單.




可以使用addSubMenu()把子菜單添加到現有的菜單. 這將返回一個子菜單(SubMenu)對象. 然後, 您可以把額外的項目添加到這個菜單上.

修改主程序, 重寫onCreateOptionsMenu(Menu)和onOptionsItemSelected(MenuItem):

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // TODO Auto-generated method stub
  boolean result = super.onCreateOptionsMenu(menu);
    SubMenu Menu_1 = menu.addSubMenu(0, 0, 0, "Menu_1");
    Menu_1.add(0, 1, 0, "Sub Menu 1 1");
    Menu_1.add(0, 2, 0, "Sub Menu 1 2");
    Menu_1.add(0, 3, 0, "Sub Menu 1 3");
    
    SubMenu Menu_2 = menu.addSubMenu(1, 4, 0, "Menu_2");
    Menu_2.add(1, 5, 0, "Sub Menu 2 1");
    Menu_2.add(1, 6, 0, "Sub Menu 2 2");

    return result;
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // TODO Auto-generated method stub
  String myMenuitem = null;
  switch(item.getItemId()){
  case 0: 
   myMenuitem = "Menu 1";
   break;
  case 1: 
   myMenuitem = "Sub Menu 1 1";
   break;
  case 2: 
   myMenuitem = "Sub Menu 1 2";
   break;
  case 3: 
   myMenuitem = "Sub Menu 1 3";
   break;
  case 4: 
   myMenuitem = "Menu 2";
   break;
  case 5: 
   myMenuitem = "Sub Menu 2 1";
   break;
  case 6: 
   myMenuitem = "Sub Menu 2 2";
   break;
  }
  
  Toast.makeText(this, myMenuitem, Toast.LENGTH_LONG).show();
  return true;
 }

除了使用addSubMenu()外, 子菜單(sub menu)亦可以使用XML定義.