Bitmap的分析与使用中有错误

[panda222]

//这里我们为什么要寻找 与ratio最接近的2的倍数呢？
//原因就在于API中对于inSimpleSize的注释：最终的inSimpleSize应该为2的倍数，我们应该向上取与压缩比最接近的2的倍数。
以上为错误
根据google官方文档
int inSampleSize
If set to a value > 1, requests the decoder to subsample the original image, returning a smaller image to save memory. The sample size is the number of pixels in either dimension that correspond to a single pixel in the decoded bitmap. For example, inSampleSize == 4 returns an image that is 1/4 the width/height of the original, and 1/16 the number of pixels. Any value <= 1 is treated the same as 1. Note: the decoder uses a final value based on powers of 2, any other value will be rounded down to the nearest power of 2.
最后一句的意思为inSimpleSize应该为2的幂（比如说2，4，8.....）,当不是2的幂的时候将会取小于它最近的2的幂(比如说3取2，6取4)。而非文中所说的2的倍数