求助！如何获取移动设备的唯一ID

找到了一段代码 不知道怎么样，实验实验去
AndroidJavaClass up = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
AndroidJavaObject currentActivity = up.GetStatic<AndroidJavaObject>("currentActivity");
AndroidJavaObject contentResolver = currentActivity.Call<AndroidJavaObject>("getContentResolver");
AndroidJavaClass secure = new AndroidJavaClass("android.provider.Settings$Secure");
string android_id = secure.CallStatic<string>("getString", contentResolver, "android_id");
return android_id;