android 获取 图片 缩略图

引用：http://www.iteye.com/topic/1114018

byte[] imageByte=getImageFromURL(urlPath.trim());
            //以下是把图片转化为缩略图再加载
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapFactory.decodeByteArray(imageByte, 0, imageByte.length,options);   <span style="font-family: Helvetica, Tahoma, Arial, sans-serif; font-size: 14px; line-height: 25px; white-space: normal;"> //此时返回bitmap为空 </span>
            options.inJustDecodeBounds = false;
            int be = (int)(options.outHeight / (float)200);
            if (be <= 0){
                be = 1;
            }
            options.inSampleSize = be;
            return BitmapFactory.decodeByteArray(imageByte, 0, imageByte.length,options);  //返回缩略图