new ShareAction(activity)
.setPlatform(var1)
.withText(text)
.withMedia(imageurl) //若是这个 imageurl 换成本地图片就能分享成功,要是换成图片链接就不能分享成功,只有微博如此
.withTargetUrl(url)
.withTitle(title)
.setCallback(umShareListener)
.share();