Access to the path is denied Xamarin forms - xamarin

Question

I am trying to copy my db file to internal storage root/document. My codes are working good till Android 9 but after it i am getting the error "System.UnauthorizedAccessException: Access to the path "/storage/emulated/0/Documents/FruitsApp/Backup/Fruits.db_2021-06-28 12:20:20" is denied"
I have try lots of way to copy all are working before Android 9 but after it i am getting above error. I am sharing my all codes. Thanks in advance.
----copy code
Java.IO.File mediaStorageDir = new Java.IO.File(Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDocuments) + path);
if (!mediaStorageDir.Exists())
{
var tt = mediaStorageDir.Mkdirs();
if (mediaStorageDir.Mkdirs() == false)
{
var fail = "failed to create";
}
}
var directoryPath = mediaStorageDir.AbsolutePath;
////////--this way to create folder is working till andorid 9
//var PathExists = Directory.Exists(directoryPath);
//if (PathExists ==false)
//{
// Directory.CreateDirectory(directoryPath);
//}
var dbPath = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "Fruits.db");
FileInfo file = new FileInfo(dbPath);
var dbName = file.Name;
var fullFileName = string.Concat("/", dbName + "_", Global.CurrentDateTime());
var newpath = string.Format("{0}{1}", directoryPath, fullFileName);
//////--- First way copy file from source to destination is working tille android 9
//using (FileStream sourceStream = System.IO.File.Open(dbPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
//using (FileStream destinationStream = System.IO.File.Create(newpath))
//{
// sourceStream.CopyToAsync(destinationStream);
//}
//////--- 2nd way copy file from source to destination is working tille android 9
byte[] dbFile = System.IO.File.ReadAllBytes(dbPath);
System.IO.File.WriteAllBytes(newpath, dbFile);
//////--- 3rd way copy file from source to destination is working tille android 9
//file.CopyTo(newpath);
I have try 3 ways to copy file from source to another all ways are working till android 9 but not working after android 9.
--Android Manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1"
android:versionName="1.0" package="com.NewWave.FruitApp" android:installLocation="auto">
<uses-sdk android:minSdkVersion="23" android:targetSdkVersion="30" />
<application android:requestLegacyExternalStorage="true" android:label="FruitApp"
android:theme="#style/MainTheme"></application>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
android:maxSdkVersion="29" />
<uses-permission android:name="android.permission.ACCESS_MEDIA_LOCATION" />
<!--<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />-->
</manifest>

Answer 1

I have a SQLite database saved in the internal storage of my cellphone, in a folder created folder named SQLite. I had troubles with the permissions and the path. Here's how I solved it:
private readonly SQLiteAsyncConnection _conn;
public LocalContext()
{
// Create directory for SQLite
Directory.CreateDirectory(Path.Combine("/storage/emulated/0/","SQLite"));
string dbPath = Path.Combine(
"/storage/emulated/0/SQLite",
"ventaMovil.db");
_conn = new SQLiteAsyncConnection(dbPath);
}
Before I called my LocalContext I check if you have writing permissions:
private async Task<bool> CheckPermissions()
{
var status = await _permissionService.CheckAndRequestPermissionAsync(new Permissions.StorageWrite());
if (status != PermissionStatus.Granted)
{
await App.Current.MainPage.DisplayAlert("Error", "You do not have writing permissions", "Okay");
return false;
}
return true;
}
For the permissions I use Xamarin Essentials:
public class PermissionService : IPermissionService
{
public async Task<PermissionStatus> CheckAndRequestPermissionAsync<T>(T permission) where T : Permissions.BasePermission
{
var status = await permission.CheckStatusAsync();
if (status != PermissionStatus.Granted)
{
status = await permission.RequestAsync();
}
return status;
}
}
And in the Android Manifest I have these two:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />