Method:
loadCurrentPlayerLeaderboardScore (GoogleApiClient apiClient, String leaderboardId, int span, int leaderboardCollection)
returns
PendingResult<Leaderboards.LoadPlayerScoreResult>
Then you must use the getScore()class method Leaderboards.LoadPlayerScoreResultto get it.
Please view these links ...
LoadCurrentPlayerLeaderboardScore Method
LoadPlayerScoreResult in PendingResult
EDIT: Here you can use it.
Games.Leaderboards.loadCurrentPlayerLeaderboardScore().setResultCallback(new ResultCallback<LoadPlayerScoreResult>() {
@Override
public void onResult(LoadPlayerScoreResult arg0) {
LeaderboardScore c = arg0.getScore();
}
});
This is how you get the grade.