Android Bitmap 与 Drawable之间的区别和转换

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huanglenzhi
2015-01-10 · 知道合伙人数码行家
huanglenzhi
知道合伙人数码行家
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  Bitmap - 称作位图,一般位图的文件格式后缀为bmp,当然编码器也有很多如RGB565、RGB888。作为一种逐像素的显示对象执行效率高,但是缺点也很明显存储效率低。我们理解为一种存储对象比较好。
  Drawable - 作为Android平下通用的图形对象,它可以装载常用格式的图像,比如GIF、PNG、JPG,当然也支持BMP,当然还提供一些高级的可视化对象,比如渐变、图形等。

  A bitmap is a Drawable. A Drawable is not necessarily a bitmap. Like all thumbs are fingers but not all fingers are thumbs.
  Bitmap是Drawable . Drawable不一定是Bitmap .就像拇指是指头,但不是所有的指头都是拇指一样.

  The API dictates: API规定:

  Though usually not visible to the application, Drawables may take a variety of forms: 尽管通常情况下对于应用是不可见的,Drawables 可以采取很多形式:

  Bitmap: the simplest Drawable, a PNG or JPEG image. Bitmap: 简单化的Drawable, PNG 或JPEG图像.
  Nine Patch: an extension to the PNG format allows it to specify information about how to stretch it and place things inside of it.
  Shape: contains simple drawing commands instead of a raw bitmap, allowing it to resize better in some cases.
  Layers: a compound drawable, which draws multiple underlying drawables on top of each other.
  States: a compound drawable that selects one of a set of drawables based on its state.
  Levels: a compound drawable that selects one of a set of drawables based on its level.
  Scale: a compound drawable with a single child drawable, whose overall size is modified based on the current level.
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