Kodeco Forums

Creating a Cross-Platform Multiplayer Game in Unity — Part 1

🎓 Courses & Articles
1

Learn how to create a cross-platform multiplayer game in Unity in the first of a fourth part tutorial.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/2015-creating-a-cross-platform-multiplayer-game-in-unity-part-1
2

This article is very helpful . Everything in the article is working perfectly. I added a feature
Invite friends for play .But , I found disconnection and reconnection problems in Google real time muliplayer.
My question is
How to reconnect to a room in Google real time muliplayer with Unity3D ?

I create a quick game multiplayer connection

const int MinOpponents = 1, MaxOpponents = 1;
const int GameVariant = 0;
PlayGamesPlatform.Instance.RealTime.CreateQuickGame(MinOpponents,MaxOpponent,GameVariant,listener);

and Create With Invitation Screen

 PlayGamesPlatform.Instance.RealTime.CreateWithInvitationScreen(
 minimumOpponents,maximumOpponents,gameVariation, listener);

Connected to a room with one opponent

I dissabled my Ethernet connection of one device

Control Panel > All Control Panel Items > Network and Sharing Center > Change Adapter Settings > Ethernet >Disable this network device

I Enabled my Ethernet connection by

Control Panel > All Control Panel Items > Network and Sharing Center > Change Adapter Settings > Ethernet >Enable this network device

In my game each player’s data is sending to each other .

PlayGamesPlatform.Instance.RealTime.SendMessageToAll (true, messageToSend);

Before Ethernet disconnect it works perfect . After ethernet reconnection data is not getting to each other , but if one device left the room , following event will call.

public void OnPeersDisconnected (string[] participantIds)
  {
      foreach (string participantID in participantIds) {
          ShowMPStatus ("Player " + participantID + " has left.");
          if (updateListener != null) {
              updateListener.PlayerLeftRoom (participantID);
          }
      }
  }

How to detect , player disconnected from net and how to reconnect to same room properly

3

Login Google Play Game

Login Game is required before call other API.Play Game Unity Plugin support google account ,not support google plus api now.

using google.service.game;

GoogleGame.Instance().login (true, false);
GoogleGame.Instance().gameEventHandler += onGameEvent;
void onGameEvent(int result_code,string eventName,string data){
Debug.Log (eventName + “-----------” + data);
if(result_code==-1&&eventName==GameEvent.onConnectSuccess){
//login success,you can do other now
}
}
You can get player infomation after login,the data is json format string

string json=GoogleGame.Instance().getCurrentUserInfo();
If you exit your game,you can login Out and disconnect

GoogleGame.Instance().loginOut();
Play Game Leaderboard

Display Leaderboard with default UI is very easy

GoogleGame.Instance().showLeaderboards();
Submit a leaderboard score,the first param is leaderboard id,the second param is score value.

GoogleGame.Instance().submitLeaderboardScore(“CgkItJ_UzNUHEAIQCQ”, 1000L);
if you want to define a ui for leaderboard,you can load data,and you will get data in event GameEvent.onLeaderboardMetadataResult

GoogleGame.Instance().loadLeaderboardsMetadata(false);
Play Game Achieve

Display Achievements with default UI is easy too

GoogleGame.Instance().showAchievements();
Unlock Achievement,the param is Achievement ID

GoogleGame.Instance().unlockAchievement(“CgkItJ_UzNUHEAIQBA”);
If you want to define ui for Achievement,you can load data ,and handle event GameEvent.onLoadAchievementsResult

GoogleGame.Instance().loadAchievements();
Game Event and Quest

Load Game Event List,and handle Event GameEvent.onLoadEventsResult

GoogleGame.Instance().loadEvents();
Change Event Data

GoogleGame.Instance().incrementEvent(“eventID”,102);
Load Quest ,and handle Event GameEvent.onLoadQuestsResult.selector is in GameConst such as SELECT_COMPLETED,sortOrder is SORT_ORDER_MOST_RECENT_FIRST or SORT_ORDER_SOCIAL_AGGREGATION

GoogleGame.Instance().loadQuests(int[] questSelectors, int sortOrder, bool forceReload);
accept Quest

GoogleGame.Instance().acceptQuest(string questid);
you can listener the state change of quest by handle event GameEvent.onQuestCompleted

4

My game crashes when I click on the multiplayer button.

I am at just before “Improving the Sign-In Process” in the tutorial. Are the updates to the plugin that require new code?

5

Hello, guys.

I still can’t manage to build my Google Play Games Services, using this method. This method ways too old, imho.

I did Cocopods install, various fix on github, etc. And still no luck!

Please kindly refer me, when there is any update for it?

I’ll be much appreciated!

Best Regards

6

I am making an app for android, and m prompted to write “Signing certificate fingerprint” in the google developer console. what should i fill in?

7

GPGS is since deprecated on iOS. Any other recommendations for cross-platform turn-based multiplayer services?

8

Well, Unity has their own multiplayer framework, although that seems to be geared more towards real-time games, and not so much for turn-based ones.

You might want to consider a service like Firebase for running a turn-based game. You can use the Realtime Database to store game state, Cloud Functions to perform server-side logic and gameplay, and Cloud Messaging to send notifications to let players know that it’s their turn.

I don’t have a tutorial on this available or anything, but there’s some documentation here that you could check out…

9

This tutorial is more than six months old so questions are no longer supported at the moment for it. We will update it as soon as possible. Thank you! :]