//诺,主要观察这两个方法

 /**
 * 压缩图片
 *
 * @param bgimage
 * @param newWidth
 * @param newHeight
 * @return
 */
 public static Bitmap zoomImage(Bitmap bgimage, double newWidth, double newHeight) {
 // 获取这个图片的宽和高
 float width = bgimage.getWidth();
 float height = bgimage.getHeight();
 // 创建操作图片用的matrix对象
 Matrix matrix = new Matrix();
 // 计算宽高缩放率
 float scaleWidth = ((float) newWidth) / width;
 float scaleHeight = ((float) newHeight) / height;
 // 缩放图片动作
 //matrix.postScale(scaleWidth, scaleHeight);//TODO 因为宽高不确定的因素,所以不缩放
 Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, (int) width,
  (int) height, matrix, true);
 return bitmap;
 }

 /**
 * 截取指定View为图片
 *
 * @param view
 * @return
 * @throws Throwable
 */
 public static Bitmap captureView(View view) throws Throwable {
 Bitmap bm = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
 view.draw(new Canvas(bm));
 return bm;
 }

//这个是使用逻辑
 Bitmap bitmap = null;
  try {
   bitmap = captureView(mShareBackgroundSign);
  } catch (Throwable throwable) {
   throwable.printStackTrace();
  }
  UMImage umImage = null;
  umImage = new UMImage(getActivity(), zoomImage(bitmap, 720, 1280));
  new ShareAction(getActivity()).setPlatform(SHARE_MEDIA.WEIXIN)
   .withText(content)
   .withMedia(umImage)
   .share();