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  • Android 图片缩放

    通过计算图片缩放值进行图片缩放

     /**
         * 根据路径获得突破并压缩返回bitmap用于显示
         *
         * @param filePath
         * @return
         */
        public static Bitmap getSmallBitmap(String filePath, int width, int height) {
            final BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(filePath, options);
    
            // Calculate inSampleSize
            options.inSampleSize = calculateInSampleSize(options, width, height);
    
            // Decode bitmap with inSampleSize set
            options.inJustDecodeBounds = false;
    
            return BitmapFactory.decodeFile(filePath, options);
        }
    计算图片的缩放值
    /**
         * 计算图片的缩放值
         *
         * @param options
         * @param reqWidth
         * @param reqHeight
         * @return
         */
        public static int calculateInSampleSize(BitmapFactory.Options options,
                                                int reqWidth, int reqHeight) {
            // Raw height and width of image
            final int height = options.outHeight;
            final int width = options.outWidth;
            int inSampleSize = 1;
    
            if (height > reqHeight || width > reqWidth) {
    
                // Calculate ratios of height and width to requested height and
                // width
                final int heightRatio = Math.round((float) height
                        / (float) reqHeight);
                final int widthRatio = Math.round((float) width / (float) reqWidth);
    
                // Choose the smallest ratio as inSampleSize value, this will
                // guarantee
                // a final image with both dimensions larger than or equal to the
                // requested height and width.
                inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
            }
            HcLog.D("HcUtil #calculateInSampleSize = " + inSampleSize);
            return inSampleSize;
        }
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  • 原文地址:https://www.cnblogs.com/zhujiabin/p/5911731.html
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