android控件之Menu

1. PopupMenu
   1. new PopupMenu(context,View)
   2. MeunInflater().inflate(R,Menuxml)
   3. popupmeun.show()
2. XML中定义menu
      一下是menu的全部xml属性
3. <?xml version="1.0" encoding="utf-8"?>
   <menu xmlns:android="http://schemas.android.com/apk/res/android">
       <item android:id="@[+][package:]id/resource_name"
             android:title="string"
             android:titleCondensed="string"
             android:icon="@[package:]drawable/drawable_resource_name"
             android:onClick="method name"
             android:showAsAction=["ifRoom" | "never" | "withText" | "always" | "collapseActionView"]
             android:actionLayout="@[package:]layout/layout_resource_name"
             android:actionViewClass="class name"
             android:actionProviderClass="class name"
             android:alphabeticShortcut="string"
             android:numericShortcut="string"
             android:checkable=["true" | "false"]
             android:visible=["true" | "false"]
             android:enabled=["true" | "false"]
             android:menuCategory=["container" | "system" | "secondary" | "alternative"]
             android:orderInCategory="integer" />
       <group android:id="@[+][package:]id/resource name"
              android:checkableBehavior=["none" | "all" | "single"]
              android:visible=["true" | "false"]
              android:enabled=["true" | "false"]
              android:menuCategory=["container" | "system" | "secondary" | "alternative"]
              android:orderInCategory="integer" >
           <item />
       </group>
       <item >
           <menu>
             <item />
           </menu>
       </item>
   </menu>
   1. android:titleCondensed="string"
      标题太长显示不全是显示这个
   2. 
      android:actionLayout="@[package:]layout/layout_resource_name"
      android:actionViewClass="class name"
      android:actionProviderClass="class name"
      这三个创建ActionBar时使用

   3. android:menuCategory

      Keyword. Value corresponding to  Menu  CATEGORY_* constants, which define the item's priority. Valid values:

      Value	Description
      container	For items that are part of a container.
      system	For items that are provided by the system.
      secondary	For items that are user-supplied secondary (infrequently used) options.
      alternative	For items that are alternative actions on the data that is currently displayed.

   4. android:orderInCategory="integer"
      重要度
4. 上下文菜单，绑定上下文菜单的view长摁会触发动作
   1. 重写Activity的OnCreateContextMenu
   2. 调用Activity的registerForContextMenu(View view)方法为view注册 上下文
   3. onContextItemSelected绑定事件监听器
5. 选项菜单
   1. 重写Activity的OnCreateOptionMenu
   2. onOptionItemSelected绑定事件监听器