Using Manage_External_Storage with .net Maui

Question

So i am Creating an android app with .net Maui, that reads an XML file from my Documents(/storage/emulated/0/Documents) folder. The App is 100% capable of generating its own XML file to ensure that it always exists. However if i Replace the XML the Application crashes with an access denied execption. I believe this is due to the Fact that i am Using Storage_Read and Storage_Write Permissions instead of Manage_External_Storage. I am now Looking for a workaround to geting that permission since .net maui has not yet updated its permission system to API level 34.

The code That Requests Permissions:

PermissionStatus lReadStatus = await Permissions.RequestAsync<Permissions.StorageRead>();  
PermissionStatus lWriteStatus =await Permissions.RequestAsync<Permissions.StorageWrite>();

My Android Manifest.xml:

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.MANAGE_DOCUMENTS" />
    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />

Answer 1

Here's an implementation that waits for the activity to exit and then checks if the user gave the permission

public static class StorageHelper
{
    public const int RequestCode = 2296;
    private static TaskCompletionSource<bool>? GetPermissionTask { get; set; }

    public static async Task<bool> GetManageAllFilesPermission()
    {
        try
        {
            Uri? uri = Uri.Parse("package:" + Platform.CurrentActivity.ApplicationInfo.PackageName);

            GetPermissionTask = new();
            Intent intent = new(global::Android.Provider.Settings.ActionManageAppAllFilesAccessPermission, uri);
            Platform.CurrentActivity.StartActivityForResult(intent, RequestCode);
        }
        catch (Exception ex)
        {
            // Handle Exception
        }

        return await GetPermissionTask.Task;
    }

    public static void OnActivityResult()
    {
        GetPermissionTask?.SetResult(Environment.IsExternalStorageManager);
    }
}

MainActivity.cs

    protected override void OnActivityResult(int requestCode, Result resultCode, Intent? data)
    {
        if (requestCode == StorageHelper.RequestCode)
            StorageHelper.OnActivityResult();

        base.OnActivityResult(requestCode, resultCode, data);
    }