Android Bitmap OOM处理

public int calculateInSampleSize(BitmapFactory.Options option, int rWidth, int rHeight) {         final int width = option.outWidth;         final int height = option.outHeight;         option.inSampleSize = 1;           while ((height / option.inSampleSize) > rHeight || (width / option.inSampleSize) > rWidth) {             option.inSampleSize *= 2;         }         return option.inSampleSize;     }