public static void shareFileToWeiXin(Context context, String path) {
    IWXAPI api = WXAPIFactory.createWXAPI(context, WX_APP_ID);
    WXFileObject fileObj = new WXFileObject();
    fileObj.fileData = inputStreamToByte(path);
    fileObj.setFilePath(path);
    fileObj.setContentLengthLimit(1024 * 1024 * 10);
    String name = "请查收合同文件.pdf";  //请查收合同文件.pdf
    //使用媒体消息分享
    WXMediaMessage msg = new WXMediaMessage(fileObj);
    msg.title = name;         //发送请求
    SendMessageToWX.Req req = new SendMessageToWX.Req();         //创建唯一标识
    req.transaction = String.valueOf(System.currentTimeMillis());
    req.message = msg;
    req.scene = SendMessageToWX.Req.WXSceneSession;
    api.sendReq(req);
}