图片压缩后上传 不失真的办法

参考 http://my.eoe.cn/isnull/archive/564.html

/**
     * 解决OOM问题
     */
    private Bitmap convertBitmap(File file) throws IOException {
        int degree = readPictureDegree(file.toString());
        Bitmap bitmap = null;
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        FileInputStream fis = new FileInputStream(file.getAbsolutePath());
        BitmapFactory.decodeStream(fis, null, o);
        int width_tmp = o.outWidth, height_tmp = o.outHeight;
        o.inJustDecodeBounds = false;
        fis.close();
        Log.v("图片宽度+图片高度", width_tmp + "+" + height_tmp);
        int scale = 1;
        float sw = (float) width_tmp / (float) 600;
        if (sw > 2) {
            scale = (int) Math.floor(sw);
        }
        o.inSampleSize = scale;
        fis = new FileInputStream(file.getAbsolutePath());
        bitmap = BitmapFactory.decodeStream(fis, null, o);
        width_tmp = bitmap.getWidth();
        height_tmp = bitmap.getHeight();
        Log.v("图片宽度2+图片高度2", width_tmp + "+" + height_tmp);
        if (width_tmp > 600) {
            sw = (float) 600 / (float) width_tmp;
            bitmap = small(sw, width_tmp, height_tmp,degree, bitmap);
        }
        fis.close();
        FileOutputStream fileOutputStream = null;
        try {
            fileOutputStream = new FileOutputStream(
                    Environment.getExternalStorageDirectory() + "/test.jpg");
            bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fileOutputStream);
            Log.v("图片宽度3+图片高度3", bitmap.getWidth() + "+" + bitmap.getHeight());
            fileOutputStream.flush();
            fileOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bitmap;
    }
    private Bitmap small(float scale, int w, int l,int degrees, Bitmap bmp) {
        int bmpWidth = w;
        int bmpHeight = l;
        Bitmap tempBmp = null;
        Matrix matrix = new Matrix();
        matrix.postScale(scale, scale);
        matrix.setRotate(degrees);
        tempBmp = Bitmap.createBitmap(bmp, 0, 0, bmpWidth, bmpHeight, matrix,
                true);
        return tempBmp;

    }

/**
     * 读取照片exif信息中的旋转角度
     * 
     * @param path
     *            照片路径
     * @return角度
     */
    public int readPictureDegree(String path) {
        int degree = 0;
        try {
            ExifInterface exifInterface = new ExifInterface(path);
            int orientation = exifInterface.getAttributeInt(
                    ExifInterface.TAG_ORIENTATION,
                    ExifInterface.ORIENTATION_NORMAL);
            switch (orientation) {
            case ExifInterface.ORIENTATION_ROTATE_90:
                degree = 90;
                break;
            case ExifInterface.ORIENTATION_ROTATE_180:
                degree = 180;
                break;
            case ExifInterface.ORIENTATION_ROTATE_270:
                degree = 270;
                break;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        Log.d("翻转角度", degree + "");
        return degree;
    }