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  • 【Android】Android内存溢出问题---用自行开辟的空间进行对内存管理

        public static Bitmap readBitmap(String path) {
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inPreferredConfig = Bitmap.Config.RGB_565;
            options.inPurgeable = true;
            options.inInputShareable = true;
            options.inSampleSize = computeSampleSize(options, -1, 128 * 128);
            options.inJustDecodeBounds = true;
            // 自行在Android上开辟一段12K大小的内存空间,存储的图片放在该内存中
            options.inTempStorage = new byte[12 * 1024];
            // 获取资源图片
            InputStream is;
            try {
                is = new FileInputStream(path);
                return BitmapFactory.decodeStream(is, null, options);
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
    
        }
    
        public static int computeSampleSize(BitmapFactory.Options options,
                int minSideLength, int maxNumOfPixels) {
            int initialSize = computeInitialSampleSize(options, minSideLength,
                    maxNumOfPixels);
    
            int roundedSize;
            if (initialSize <= 8) {
                roundedSize = 1;
                while (roundedSize < initialSize) {
                    roundedSize <<= 1;
                }
            } else {
                roundedSize = (initialSize + 7) / 8 * 8;
            }
    
            return roundedSize;
        }
    
        private static int computeInitialSampleSize(BitmapFactory.Options options,
                int minSideLength, int maxNumOfPixels) {
            double w = options.outWidth;
            double h = options.outHeight;
    
            int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math
                    .sqrt(w * h / maxNumOfPixels));
            int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(
                    Math.floor(w / minSideLength), Math.floor(h / minSideLength));
    
            if (upperBound < lowerBound) {
                return lowerBound;
            }
    
            if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
                return 1;
            } else if (minSideLength == -1) {
                return lowerBound;
            } else {
                return upperBound;
            }
        }
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  • 原文地址:https://www.cnblogs.com/niray/p/3774612.html
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