WXFileObject  能分享TXT文件，分享不了视频,分享本地视频需要怎么处理？

File file = new File(filePath);
WXFileObject fileObj = new WXFileObject();
fileObj.filePath = filePath;
fileObj.fileData = inputStreamToByte(filePath);//文件路径
WXMediaMessage message = new WXMediaMessage();
message.mediaObject = fileObj;
message.title = file.getName();
SendMessageToWX.Req req = new SendMessageToWX.Req();
req.transaction = String.valueOf(System.currentTimeMillis());