bitmap壓縮並裁剪成指定邊長的正方形

/**
     * @param bitmap      原圖
     * @param edgeLength  希望得到的正方形部分的邊長
     * @return  縮放截取正中部分後的位圖。
     */
    public static Bitmap centerSquareScaleBitmap(Bitmap bitmap, int edgeLength)
    {
        if(null == bitmap || edgeLength <= 0)
        {
            return  null;
        }
        Bitmap result = bitmap;
        int widthOrg = bitmap.getWidth();
        int heightOrg = bitmap.getHeight();
        if(widthOrg > edgeLength && heightOrg > edgeLength)
        {
            //壓縮到一個最小長度是edgeLength的bitmap
            int longerEdge = (int)(edgeLength * Math.max(widthOrg, heightOrg) / Math.min(widthOrg, heightOrg));
            int scaledWidth = widthOrg > heightOrg ? longerEdge : edgeLength;
            int scaledHeight = widthOrg > heightOrg ? edgeLength : longerEdge;
            Bitmap scaledBitmap;
            try{
                scaledBitmap = Bitmap.createScaledBitmap(bitmap, scaledWidth, scaledHeight, true);
            }
            catch(Exception e){
                return null;
            }
            //從圖中截取正中間的正方形部分。
            int xTopLeft = (scaledWidth - edgeLength) / 2;
            int yTopLeft = (scaledHeight - edgeLength) / 2;
            try{
                result = Bitmap.createBitmap(scaledBitmap, xTopLeft, yTopLeft, edgeLength, edgeLength);
                scaledBitmap.recycle();
            }
            catch(Exception e){
                return null;
            }
        }
        return result;
    }

 原出處http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2014/0917/1686.html