Android 官方文檔：（三）資源 —— 3.6.1 資源種類概述

Each of the documents in this section describe the usage, format and syntax for a certain typeof application resource that you can provide in your resources directory (res/).

Here's a brief summary of each resource type:

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.).