使用XML定義子菜單(sub menu)

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




例如:

首先創建一個文件夾, /res/menu

並創建一個新/res/menu/的menu.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:title="Submenu 1">
 <menu>
 <item android:id="@+id/option11"
        android:title="1 1" />
    <item android:id="@+id/option12"
        android:title="1 2" />
       <item android:id="@+id/option13"
        android:title="1 3" />
 </menu>
</item>
<item android:title="Submenu 2">
 <menu>
 <item android:id="@+id/option21"
        android:title="2 1" />
    <item android:id="@+id/option22"
        android:title="2 2" />
 </menu>
</item>
<item android:title="Submenu 3">
 <menu>
 <item android:id="@+id/option31"
        android:title="3 1" />
    <item android:id="@+id/option32"
         android:title="3 2" />
 </menu>
</item>
</menu>

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

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // TODO Auto-generated method stub
  MenuInflater inflater = getMenuInflater();
  inflater.inflate(R.menu.menu, menu);
  return true;
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // TODO Auto-generated method stub
  String myMenuitem = null;
  switch (item.getItemId()){
  case (R.id.option11): myMenuitem="option 1 1"; break;
  case (R.id.option12): myMenuitem="option 1 2"; break;
  case (R.id.option13): myMenuitem="option 1 3"; break;
  case (R.id.option21): myMenuitem="option 1 1"; break;
  case (R.id.option22): myMenuitem="option 1 2"; break;
  case (R.id.option31): myMenuitem="option 1 1"; break;
  case (R.id.option32): myMenuitem="option 1 2"; break;
  }
  Toast.makeText(this, myMenuitem, Toast.LENGTH_LONG).show();
  return true;
 }