在 Unity 中獲取 MTP 設備

Question

您好，我目前正在為一個課程項目開發一個統一的游戲，我絕對必須能夠將我的備份文件從我的電腦存儲在我的手機上，而且我必須能夠檢索它們。 我在 windows 10 上使用 android 手機和 Unity 2019.3.14f1。

我嘗試使用 NuGet MediaDevice package，如下所示：

 public static void CopySaveFromDevice()
    {
        var devices = MediaDevice.GetDevices();
        Debug.Log(devices);
        using (var device = devices.First(d => d.FriendlyName == "Mi Note 10"))
        {
            Debug.Log(device);
            device.Connect();
            var savesDir = device.GetDirectoryInfo(@"/Treen/Saves");

            var files = savesDir.EnumerateFiles("*.tree", SearchOption.TopDirectoryOnly);

            foreach (var file in files)
            {
                MemoryStream memoryStream = new System.IO.MemoryStream();
                device.DownloadFile(file.FullName, memoryStream);
                memoryStream.Position = 0;
                WriteStreamToDisk(Application.persistentDataPath + "/Saves/" + file.Name, memoryStream);
            }
            device.Disconnect();
        }

    }

    static void WriteStreamToDisk(string filePath, MemoryStream memoryStream)
    {
        using (FileStream file = new FileStream(filePath, FileMode.Create, System.IO.FileAccess.Write))
        {
            byte[] bytes = new byte[memoryStream.Length];
            memoryStream.Read(bytes, 0, (int)memoryStream.Length);
            file.Write(bytes, 0, bytes.Length);
            memoryStream.Close();
        }
    }

但我有這個錯誤：

NullReferenceException: Object reference not set to an instance of an object
MediaDevices.MediaDevice.GetDevices () (at <016781043aa441d5b0169b9d5116ee77>:0)
ManageSaves.CopySaveFromDevice () (at Assets/Scripts/ManageSaves.cs:65)
ManageSaves.Testing () (at Assets/Scripts/ManageSaves.cs:57)
MainMenu.Testing () (at Assets/Scripts/MainMenu.cs:69)
UnityEngine.Events.InvokableCall.Invoke () (at <23a7799da2e941b88c6db790c607d655>:0)
UnityEngine.Events.UnityEvent.Invoke () (at <23a7799da2e941b88c6db790c607d655>:0)
UnityEngine.UI.Button.Press () (at C:/Program Files/Unity/Hub/Editor/2019.3.14f1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/UI/Core/Button.cs:68)
UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at C:/Program Files/Unity/Hub/Editor/2019.3.14f1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/UI/Core/Button.cs:110)
UnityEngine.EventSystems.ExecuteEvents.Execute (UnityEngine.EventSystems.IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at C:/Program Files/Unity/Hub/Editor/2019.3.14f1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/ExecuteEvents.cs:50)
UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at C:/Program Files/Unity/Hub/Editor/2019.3.14f1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/ExecuteEvents.cs:261)
UnityEngine.EventSystems.EventSystem:Update() (at C:/Program Files/Unity/Hub/Editor/2019.3.14f1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/EventSystem.cs:377)

當我不團結時，代碼會檢測設備。 所以我得出結論，它在統一環境中不起作用：/

您是否知道如何解決此問題或以其他方式以有線模式保存到我的手機？ 也許是免費資產？

Answer 1

我強烈建議您不要使用MTP Device文件路徑。 為了您的目的，我可以告訴您制作一個 TCP 套接字將您的文件移動到您的設備。 在這里閱讀更多