権限あまり付けたくない.cs

using UnityEngine;
using System.Collections;

public class SystemWrapper{

	// AndroidでSystemInfo.deviceUniqueIdentifierを使うとアクセス権限が増えるので回避
	public static string GetDeviceUniqueIdentifier(){
#if UNITY_ANDROID || UNITY_EDITOR
		string key = PlayerPrefsKey.userId;
		if(PlayerPrefs.HasKey(key)){
			return PlayerPrefs.GetString(key);
		}else{
			var userId = GenerateUserId();
			PlayerPrefs.SetString(key, userId);
			return userId;
		}
#else
		return SystemInfo.deviceUniqueIdentifier;
#endif
	}

	public static string GenerateUserId(){
		Debug.Log ("新しいユーザIDを発行");
		return System.DateTime.Now.ToString () + Random.Range (1, 10000000).ToString ();
	}

}