【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;

        }

    }