Leaderboards in Unity games

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This topics describes how to use Play Games Services leaderboards in Unity games.

Before you get started

Set up your Unity project and the Google Play Games plugin for Unity. For details, see the Get started guide.

Create events

You create leaderboards in Google Play Console. For details, see the leaderboards guide for Play Games Services. After you create a leaderboard, add its Android resource to the plugin as described in the get started guide.

Post a Score to a Leaderboard

To post a score to a leaderboard, call Social.ReportScore.

    using GooglePlayGames;
    using UnityEngine.SocialPlatforms;
    ...
    // post score 12345 to leaderboard ID "Cfji293fjsie_QA")
    Social.ReportScore(12345, "Cfji293fjsie_QA", (bool success) => {
        // handle success or failure
    });

To post a score and include a metadata tag use the Play Game Services instance directly:

    using GooglePlayGames;
    using UnityEngine.SocialPlatforms;
    ...
    // post score 12345 to leaderboard ID "Cfji293fjsie_QA" and tag "FirstDaily")
    Social.ReportScore(12345, "Cfji293fjsie_QA", "FirstDaily", (bool success) => {
        // handle success or failure
    });

Note that the platform and the server will automatically discard scores that are lower than the player's existing high score, so you can submit scores freely without any checks to test whether or not the score is greater than the player's existing score.

Show the Leaderboard UI

To show the built-in UI for all leaderboards, call Social.ShowLeaderboardUI.

    using GooglePlayGames;
    using UnityEngine.SocialPlatforms;
    ...
    // show leaderboard UI
    Social.ShowLeaderboardUI();

If you wish to show a particular leaderboard instead of all leaderboards, you can pass a leaderboard ID to the method. This, however, is a Play Games extension, so the Social.Active object needs to be cast to a PlayGamesPlatform object first:

    using GooglePlayGames;
    using UnityEngine.SocialPlatforms;
    ...
    // show leaderboard UI
    PlayGamesPlatform.Instance.ShowLeaderboardUI("Cfji293fjsie_QA");

Access Leaderboard data

There are 2 methods to retrieving the leaderboard score data.

Use Social.ILeaderboard

This method uses the ILeaderboard interface to define the scope and filters for getting the data. This approach allows you to configure: 1. The leaderboard Id 2. The collection (social or public) 3. The timeframe (daily, weekly, all-time) 4. The rank position to start retrieving scores. 5. The number of scores (the default is 25). 6. Filter by user id.

If the from parameter is non-positive, then the results returned are player-centered, meaning the scores around the current player's score are returned.

    ILeaderboard lb = PlayGamesPlatform.Instance.CreateLeaderboard();
    lb.id = "MY_LEADERBOARD_ID";
    lb.LoadScores(ok =>
        {
            if (ok) {
                LoadUsersAndDisplay(lb);
            }
            else {
                Debug.Log("Error retrieving leaderboardi");
            }
        });

Use PlayGamesPlatform.LoadScores()

This method uses the PlayGamesPlatform directly. This approach provides additional flexibility and information when accessing the leaderboard data.

    PlayGamesPlatform.Instance.LoadScores(
            GPGSIds.leaderboard_leaders_in_smoketesting,
            LeaderboardStart.PlayerCentered,
            100,
            LeaderboardCollection.Public,
            LeaderboardTimeSpan.AllTime,
            (data) =>
            {
                mStatus = "Leaderboard data valid: " + data.Valid;
                mStatus += "\n approx:" +data.ApproximateCount + " have " + data.Scores.Length;
            });

The parameters for LoadScores() are:

  1. leaderboardId
  2. start position (top scores or player centered)
  3. row count
  4. leaderboard collection (social or public)
  5. time span (daily, weekly, all-time)
  6. callback accepting a LeaderboardScoreData object.

The LeaderboardScoreData class is used to return information back to the caller when loading scores. The members are: 1. Id - the leaderboard id 2. Valid - true if the returned data is valid (the call was successful) 3. Status - the ResponseStatus of the call 4. ApproximateCount - the approximate number of scores in the leaderboard 5. Title - the title of the leaderboard 6. PlayerScore - the score of the current player 7. Scores - the list of scores 8. PrevPageToken - a token that can be used to call LoadMoreScores() to get the previous page of scores. 9. NextPageToken - a token that can be used to call LoadMoreScores() to get the next page of scores.

    void GetNextPage(LeaderboardScoreData data)
    {
        PlayGamesPlatform.Instance.LoadMoreScores(data.NextPageToken, 10,
            (results) =>
            {
                mStatus = "Leaderboard data valid: " + data.Valid;
                mStatus += "\n approx:" +data.ApproximateCount + " have " + data.Scores.Length;
            });
    }

This call may fail when trying to load friends with ResponseCode.ResolutionRequired if the user has not shared their friends list with the game. In this case, use AskForLoadFriendsResolution to request access.

Get player names

Each score has the userId of the player that made the score. You can use Social.LoadUsers() to load the player profile. Remember that the contents of the player profile are subject to privacy settings of the players.

    internal void LoadUsersAndDisplay(ILeaderboard lb)
    {
        // get the user ids
        List<string> userIds = new List<string>();

        foreach(IScore score in lb.scores) {
            userIds.Add(score.userID);
        }
        // load the profiles and display (or in this case, log)
        Social.LoadUsers(userIds.ToArray(), (users) =>
            {
                string status = "Leaderboard loading: " + lb.title + " count = " +
                    lb.scores.Length;
                foreach(IScore score in lb.scores) {
                    IUserProfile user = FindUser(users, score.userID);
                    status += "\n" + score.formattedValue + " by " +
                        (string)(
                            (user != null) ? user.userName : "**unk_" + score.userID + "**");
                }
                Debug.log(status);
            });
    }