Android有另外一种内存区域,叫做Ashmem

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。 http://www.readnovel.com/novel/72191/10069.html http://www.readnovel.com/novel/72191/10070.html http://www.readnovel.com/novel/72191/10071.html http://www.readnovel.com/novel/72191/10072.html http://www.readnovel.com/novel/72191/10073.html http://www.readnovel.com/novel/72191/10074.html http://www.readnovel.com/novel/72191/10075.html http://www.readnovel.com/novel/72191/10076.html http://www.readnovel.com/novel/72191/10077.html http://www.readnovel.com/novel/72191/10078.html http://www.readnovel.com/novel/72191/10079.html 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