https://developefinal WXMediaMessage msg = new WXMediaMessage();
msg.setThumbImage(Utils.extractThumbNail(path, 150, 150, true));
if (!TextUtils.isEmpty(bean.getVideoTitle()))
    msg.title = bean.getVideoTitle();
if (!TextUtils.isEmpty(bean.getVideoDesc()))
    msg.description = bean.getVideoDesc();
msg.mediaObject = gameVideoFileObject;
msg.setThumbImage(null);
SendMessageToWX.Req req = new SendMessageToWX.Req();
req.transaction = buildTransaction("video");
req.message = msg;
req.scene = mTargetScene; //分享到哪 ：微信对话，朋友圈
api.sendReq(req);

rs.weixin.qq.com/doc/oplatform/Mobile_App/Share_and_Favorites/Android.html