【android动画】关于android:persistentDrawingCache的解释

　　网上很多人在寻找这个答案，下面将API中的解释进行翻译：

　　Defines the persistence of the drawing cache. The drawing cache might be enabled by a ViewGroup for all its children in specific situations (for instance during a scrolling.) This property lets you persist the cache in memory after its initial usage. Persisting the cache consumes more memory but may prevent frequent garbage collection is the cache is created over and over again. By default the persistence is set to scrolling.

　　大致意思如下：

　　定义绘图的高速缓存的持久性。绘图缓存可能由一个 ViewGroup 在特定情况下为其所有的子类启用，例如在一个滚动的过程中。此属性可以保留在内存中的缓存后其初始的使用。坚持缓存会消耗更多的内存，但可能会阻止频繁的垃圾回收是反复创建缓存。默认情况下持续存在设置为滚动。

　　其属性值只有以下几种：

　　ConstantValueDescription

　　none0x0The drawing cache is not persisted after use.

　　animation0x1The drawing cache is persisted after a layout animation.

　　scrolling0x2The drawing cache is persisted after a scroll.

　　all0x3The drawing cache is always persisted.

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