Drawable类

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转载自：http://www.cnblogs.com/feisky/archive/2010/01/08/1642567.html

Android SDK中的简介：A Drawable is a general abstraction for “something that can be drawn.” Most often you will deal with Drawable as the type of resource retrieved for drawing things to the screen; the Drawable class provides a generic API for dealing with an underlying visual resource that may take a variety of forms.

看了以上简介，Drawable是一个通用的抽象类，它的目的是告诉你什么东西是可以画的。你会发现基于Drawable类扩展出各种绘图的类，例如：BitmapDrawable。