UnityからSCORE BOARD(http://www.score-board.mobi/)を使う場合 AndroidManifest.xmlはREADME.txtを見て更新してください。

ScoreBoard.cs

// スコアの送信
  void PostRanking (int score)
	{
#if UNITY_ANDROID
		AndroidJavaClass plugin = new AndroidJavaClass ("jp.basicinc.gamefeat.ranking.android.sdk.controller.GFRankingController");
		AndroidJavaClass unityPlayer = new AndroidJavaClass ("com.unity3d.player.UnityPlayer");
		AndroidJavaObject activity = unityPlayer.GetStatic<AndroidJavaObject> ("currentActivity");
		AndroidJavaObject ranking  = plugin.CallStatic<AndroidJavaObject> ("getIncetance", activity);
		ranking.Call ("sendScore",   new string[] {"[ゲームモードID]"}, new string[] { score.ToString()});
#endif
	}
  
// ランキングページ表示
  void ShowRanking ()
	{
#if UNITY_ANDROID
		AndroidJavaClass plugin = new AndroidJavaClass ("jp.basicinc.gamefeat.ranking.android.sdk.controller.GFRankingController");
		AndroidJavaClass unityPlayer = new AndroidJavaClass ("com.unity3d.player.UnityPlayer");
		AndroidJavaObject activity = unityPlayer.GetStatic<AndroidJavaObject> ("currentActivity");
		plugin.CallStatic ("show", activity, "[ゲームモードID]");
#endif
	}