//U3d里面的代码

public void Share(string roomId = null)
    {
        Debug.Log ("------------------------进行微信好友分享-------------------------------------------");
        string room = (roomId==null)?"":"房间号是：" + roomId;
        AndroidJavaObject.Call("WeChatShare", 
            new object[] {
            "http://www.daqingxinshikong.com/WebServer/?from=singlemessage&isappinstalled=1",
            "一个很好玩的游戏",
            "今天玩了一个很好玩的游戏3D游戏，你也来试试吧！哈哈!"+room
            });
    }

//Eclipes里面的代码

public void WeChatShare(String url, String title, String content)
  {
    WXWebpageObject webpage = new WXWebpageObject();
    webpage.webpageUrl = url;
    
    WXMediaMessage msg = new WXMediaMessage(webpage);
    msg.title = title;
    msg.description = content;
    Bitmap thumb = BitmapFactory.decodeResource(getResources(), 2130837505);
    msg.thumbData = ShareUtils.bmpToByteArray(thumb, true);
    
    SendMessageToWX.Req req = new SendMessageToWX.Req();
    req.transaction = buildTransaction("img");
    req.message = msg;
    req.scene = 0;
    WXEntryActivity.api.sendReq(req);
  }