在开发Android软件的过程中，xml文件里经常会使用一些Android内部定义的资源和常量，我们如何获取相应的资源信息，以下做一个简要的说明。
使用Android资源或常量的方法，分为两种：
- 在JAVA程序中，我们按以下方式引用资源：android.R.<资源类型>.<资源ID>，如：
android.R.drawable.ic_menu_save
- 在XML文件中，按以下方式引用资源: @android:<资源类型>/资源ID
@android:drawable/ic_menu_save
Android定义了以下几类资源和常量可供我们使用：
参考文档：http://developer.android.com/guide/topics/resources/available-resources.html#drawables
以下所引用的路径都是"android.jar"下的相对路径
- Animation Resources
Define pre-determined animations.
Tween animations are saved in res/anim/ and accessed from the R.anim class.
Frame animations are saved in res/drawable/ and accessed from the R.drawable class.
- Color State List Resource
Define a color resources that changes based on the View state.
Saved in res/color/ and accessed from the R.color class
- Drawable Resources
Define various graphics with bitmaps or XML.
Saved in res/drawable/ and accessed from the R.drawable class.
- Layout Resource
Define the layout for your application UI.
Saved in res/layout/ and accessed from the R.layout class.
- Menu Resource
Define the contents of your application menus.
Saved in res/menu/ and accessed from the R.menu class.
- String Resources
Define strings, string arrays, and plurals (and include string formatting and styling).
Saved in res/values/ and accessed from the R.string, R.array, and R.plurals classes.
- Style Resource
Define the look and format for UI elements.
Saved in res/values/ and accessed from the R.style class.
- More Resource Types
Define values such as booleans, integers, dimensions, colors, and other arrays.
Saved in res/values/ but each accessed from unique R sub-classes (such as R.bool, R.integer, R.dimen, etc.).
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