1、微信分享报：

2、这个问题是因为图片太大导致：

WXWebpageObject webpage = new WXWebpageObject();
        webpage.webpageUrl = qrCodeUrl;

        //用 WXWebpageObject 对象初始化一个 WXMediaMessage 对象
        WXMediaMessage msg = new WXMediaMessage(webpage);
        msg.title ="测试测试";
        msg.description ="这里是描述";
        Bitmap thumbBmp = BitmapFactory.decodeResource(getResources(), R.drawable.img);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        thumbBmp.compress(Bitmap.CompressFormat.PNG, 90, baos);
        msg.thumbData = baos.toByteArray();

        //构造一个Req
        SendMessageToWX.Req req = new SendMessageToWX.Req();
        req.transaction = buildTransaction("webpage");
        req.message = msg;
        req.scene = WXSceneSession;

        //调用api接口，发送数据到微信
        api.sendReq(req);

说明：R.drawable.img 这个资源文件不能太大，大了就会报错，一般控制在32Kb.