经过上面的代码处理后，可清除的Bitmap会驻留在 Ashmem 堆中。不管发生什么，垃圾回收器都不会自动回收这些 Bitmap。当 Android 绘制系统在渲染这些图片，Android 的系统库就会把这些 Bitmap 从 Ashmem 堆中抽取出来，而当渲染结束后，这些 Bitmap 又会被放回到原来的位置。如果一个被抽取的图片需要再绘制一次，系统仅仅需要把它再解码一次，这个操作非常迅速。
这听起来像一个完美的解决方案，但是问题是Bitmap解码的操作是运行在UI线程的。Bitmap解码是非常消耗CPU资源的，当消耗过大时会引起UI阻塞。因为这个原因，所以Google不推荐使用这个特性。现在它们推荐使用另外一个特性——inBitmap。但是这个特性直到Android3.0之后才被支持。即使是这样，这个特性也不是非常有用，除非 App 里的所有图片大小都相同，这对Fackbook来说显然是不适用的。一直到4.4版本，这个限制才被移除了。但我们需要的是能够运行在 Android 2.3 - 最新版本中的通用解决方案。
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