Android crop bitmap file to square

Android crop bitmap file to square

reprint  December 27, 2016 16:05:36

• Label:
• android /
• picture

• 1072

Original link: Android image cropping and intercepting the square part in the middle 
After a given image is scaled to maintain the aspect ratio, intercept the square part in the middle

/**

   * @param bitmap      原图
   * @param edgeLength  希望得到的正方形部分的边长
   * @return  缩放截取正中部分后的位图。
   */
  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)
   {
    //压缩到一个最小长度是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;
          }

       //从图中截取正中间的正方形部分。
       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;
  }

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It should be noted that the bitmap parameter must be obtained from the original image. If it has been compressed by BitmapFactory inSampleSize, it may not be square.