bitmap占用内存大小

bitmap.getByteCount();

得到的是kb

bitmap.getRowBytes() * bitmap.getHeight();

getByteCount() is just a convenience method which does exactly what you have placed in the else-block. In other words, if you simply rewrite getSizeInBytes to always return "bitmap.getRowBytes() * bitmap.getHeight()" you don't need the Android version check.

翻译过来就是：getByteCount()受android版本限制，而[code]getRowBytes() * bitmap.getHeight()则不受android版本限制。