图片等比例缩放

 图片的等比例缩放，第一个参数是图片路径，第二个是最终所需要图片的(宽高里取值最大的)的最大值 // 限制值MaxSize*（2/3）=实际使用值的比较值IMAGE_MAX_SIZE // 例如：限制图片大小为400，则实际使用的比较值应为400*（2/3） // 260*2/3=390 public static Bitmap decodeFile(String path, int MaxSize) { File f = new File(path); int IMAGE_MAX_SIZE = MaxSize * 2 / 3; Bitmap b = null; try { // Decode image size BitmapFactory.Options o = new BitmapFactory.Options(); o.inJustDecodeBounds = true; //FileInputStream fis = new FileInputStream(f); //BitmapFactory.decodeStream(fis, null, o); //fis.close(); double scale = 1; if (o.outHeight > IMAGE_MAX_SIZE || o.outWidth > IMAGE_MAX_SIZE) { scale = Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE / (double) Math.max(o.outHeight, o.outWidth)) / Math.log(0.5))); } // Decode with inSampleSize BitmapFactory.Options o2 = new BitmapFactory.Options(); o2.inSampleSize = (int) scale; FileInputStream fis = new FileInputStream(f); b = BitmapFactory.decodeStream(fis, null, o2); fis.close(); } catch (FileNotFoundException e) { } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return b; }