Android Unity c#：写入保存游戏数据时发生 UnauthorizedAccessException

我正在 Android 中调试 Unity 游戏，一切都在 Unity 编辑器中运行。在 Android 上保存当前游戏数据时，我收到 UnauthorizedAccessException。

我正在写入持久数据路径，所以我不明白为什么访问被阻止。

这是使用 Logcat 的控制台日志：

<i>AndroidPlayer(motorola_Moto_G_(5)@192.168.0.26)</i> UnauthorizedAccessException: 
Access to the path "/current.sg" is denied.
at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options) [0x0028a] in /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/FileStream.cs:320 
  at System.IO.FileStream..ctor (System.String path, FileMode mode) [0x00000] in <filename unknown>:0 
  at SaveLoadManager.SaveGame (.Game currentGame) [0x0002a] in F:\Work\Magister\Magister\Magister\Assets\Scripts\SaveLoadManager.cs:16 
  at PlayerController.FixedUpdate () [0x0058e] in F:\Work\Magister\Magister\Magister\Assets\Scripts\PlayerController.cs:244 

PlayerController 中的相关代码在 FixUpdate() 循环中运行：

if (!gameSaved)
{
    SaveLoadManager.SaveGame(gameManager.GetComponent<Game>());
    gameSaved = true;
}

SaveLoadManager 中的 SaveGame 函数：

public static void SaveGame(Game currentGame)
{
    string saveGameFileName = Path.DirectorySeparatorChar + "current.sg";
    string filePath = Path.Combine(Application.persistentDataPath, saveGameFileName);
    BinaryFormatter bf = new BinaryFormatter();
    FileStream file = new FileStream(filePath, FileMode.Create);
    GameData data = new GameData(currentGame);
    bf.Serialize(file, data);
    file.Close();
}

AndroidManifest.xml中的读/写权限：

<uses-permission
    android:name="android.permission.WRITE_EXTERNAL_STORAGE"
    android:maxSdkVersion="18" />

<uses-permission
    android:name="android.permission.READ_EXTERNAL_STORAGE"
    android:maxSdkVersion="18" />

您必须检查该目录是否存在Directory.Exists在写入该路径之前。如果没有，请使用Directory.CreateDirectory创建它。

请注意，直接将文件保存到Application.persistentDataPath。您必须先在其中创建一个文件夹，然后将文件保存在该文件夹中。所以Application.persistentDataPath/yourcreatedfolder/yourfile.extension很好。通过这样做，您的代码也将在 iOS 上运行。

该代码应该如下所示：

string saveGameFileName = "current";
string filePath = Path.Combine(Application.persistentDataPath, "data");
filePath = Path.Combine(filePath, saveGameFileName + ".sg");


//Create Directory if it does not exist
if (!Directory.Exists(Path.GetDirectoryName(filePath)))
{
    Directory.CreateDirectory(Path.GetDirectoryName(filePath));
}

try
{
    BinaryFormatter bf = new BinaryFormatter();
    FileStream file = new FileStream(filePath, FileMode.Create);
    GameData data = new GameData(currentGame);
    bf.Serialize(file, data);
    file.Close();
    Debug.Log("Saved Data to: " + filePath.Replace("/", "\\"));
}
catch (Exception e)
{
    Debug.LogWarning("Failed To Save Data to: " + filePath.Replace("/", "\\"));
    Debug.LogWarning("Error: " + e.Message);
}