getCropBitmap

private static Bitmap getCropBitmap (Bitmap origialBitmap,int left, int top, int right, int bottom){
  int targetWidth  = right-left;
  int targetHeight = bottom-top;
  Bitmap cutBitmap = Bitmap.createBitmap(targetWidth,targetHeight, Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(cutBitmap);
  Rect desRect = new Rect(0, 0, targetWidth, targetHeight);
  Rect srcRect = new Rect(left, top, right, bottom);
  canvas.drawBitmap(origialBitmap, srcRect, desRect, null);
  return cutBitmap;
}