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mirror of https://github.com/bitwarden/mobile synced 2025-12-11 05:43:30 +00:00
Files
mobile/src/App/Platforms/Android/Services/DeviceActionService.cs
Dinis Vieira 5a4a54f4af [PM-7385] Fix for allowing switching accounts while creating a passkey of Android (#3155)
* PM-7385 Fixed for allowing switching accounts while creating a passkey on Android.
This fixes also include scenarios where we need to unlock the vault after switching
Also fixed the issue where tapping on cipher won't do anything after switching.

* PM-7385 ensure the Options.Fido2CredentialAction and FromFido2Framework are reset when the Credential flow is started to avoid erratic behaviors when switching accounts, app is in background or other edge case scenarios.
These properties where replaced by calls to _fido2MakeCredentialConfirmationUserInterface.IsConfirmingNewCredential instead.

* Minor changes and added comments

* [PM-7385] Implemented several changes suggested in PR for better/cleaner code.

* PM-7385 Added several minor code improvemments.
2024-04-16 21:52:52 +01:00

786 lines
29 KiB
C#

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.Nfc;
using Android.OS;
using Android.Provider;
using Android.Text;
using Android.Text.Method;
using Android.Views;
using Android.Views.InputMethods;
using Android.Widget;
using AndroidX.Credentials;
using Bit.App.Abstractions;
using Bit.Core.Resources.Localization;
using Bit.App.Utilities;
using Bit.App.Utilities.Prompts;
using Bit.Core.Abstractions;
using Bit.App.Droid.Utilities;
using Bit.App.Models;
using Bit.Droid.Autofill;
using Microsoft.Maui.Controls.Compatibility.Platform.Android;
using Resource = Bit.Core.Resource;
using Application = Android.App.Application;
using Bit.Core.Services;
using Bit.Core.Utilities.Fido2;
namespace Bit.Droid.Services
{
public class DeviceActionService : IDeviceActionService
{
private readonly IStateService _stateService;
private readonly IMessagingService _messagingService;
private AlertDialog _progressDialog;
object _progressDialogLock = new object();
private Toast _toast;
private string _userAgent;
public DeviceActionService(
IStateService stateService,
IMessagingService messagingService)
{
_stateService = stateService;
_messagingService = messagingService;
}
public string DeviceUserAgent
{
get
{
if (string.IsNullOrWhiteSpace(_userAgent))
{
_userAgent = $"Bitwarden_Mobile/{AppInfo.VersionString} " +
$"(Android {Build.VERSION.Release}; SDK {Build.VERSION.Sdk}; Model {Build.Model})";
}
return _userAgent;
}
}
public Bit.Core.Enums.DeviceType DeviceType => Bit.Core.Enums.DeviceType.Android;
public void Toast(string text, bool longDuration = false)
{
if (_toast != null)
{
_toast.Cancel();
_toast.Dispose();
_toast = null;
}
_toast = Android.Widget.Toast.MakeText(Microsoft.Maui.ApplicationModel.Platform.CurrentActivity, text,
longDuration ? ToastLength.Long : ToastLength.Short);
_toast.Show();
}
public bool LaunchApp(string appName)
{
try
{
if ((int)Build.VERSION.SdkInt < 33)
{
// API 33 required to avoid using wildcard app visibility or dangerous permissions
// https://developer.android.com/reference/android/content/pm/PackageManager#getLaunchIntentSenderForPackage(java.lang.String)
return false;
}
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
appName = appName.Replace("androidapp://", string.Empty);
var launchIntentSender = activity?.PackageManager?.GetLaunchIntentSenderForPackage(appName);
launchIntentSender?.SendIntent(activity, Result.Ok, null, null, null);
return launchIntentSender != null;
}
catch (IntentSender.SendIntentException)
{
return false;
}
catch (Android.Util.AndroidException)
{
return false;
}
}
public async Task ShowLoadingAsync(string text)
{
if (_progressDialog != null)
{
await HideLoadingAsync();
}
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
var inflater = (LayoutInflater)activity.GetSystemService(Context.LayoutInflaterService);
var dialogView = inflater.Inflate(Resource.Layout.progress_dialog_layout, null);
var txtLoading = dialogView.FindViewById<TextView>(Resource.Id.txtLoading);
txtLoading.Text = text;
txtLoading.SetTextColor(ThemeHelpers.TextColor);
_progressDialog = new AlertDialog.Builder(activity)
.SetView(dialogView)
.SetCancelable(false)
.Create();
_progressDialog.Show();
}
public Task HideLoadingAsync()
{
// Based on https://github.com/redth-org/AndHUD/blob/master/AndHUD/AndHUD.cs
lock (_progressDialogLock)
{
if (_progressDialog is null)
{
return Task.CompletedTask;
}
void actionDismiss()
{
try
{
if (IsAlive(_progressDialog) && IsAlive(_progressDialog.Window))
{
_progressDialog.Hide();
_progressDialog.Dismiss();
}
}
catch
{
// ignore
}
_progressDialog = null;
}
// First try the SynchronizationContext
if (Application.SynchronizationContext != null)
{
Application.SynchronizationContext.Send(state => actionDismiss(), null);
return Task.CompletedTask;
}
// Otherwise try OwnerActivity on dialog
var ownerActivity = _progressDialog?.OwnerActivity;
if (IsAlive(ownerActivity))
{
ownerActivity.RunOnUiThread(actionDismiss);
return Task.CompletedTask;
}
// Otherwise try get it from the Window Context
if (_progressDialog?.Window?.Context is Activity windowActivity && IsAlive(windowActivity))
{
windowActivity.RunOnUiThread(actionDismiss);
return Task.CompletedTask;
}
// Finally if all else fails, let's see if current activity is MainActivity
if (Microsoft.Maui.ApplicationModel.Platform.CurrentActivity is MainActivity activity && IsAlive(activity))
{
activity.RunOnUiThread(actionDismiss);
return Task.CompletedTask;
}
return Task.CompletedTask;
}
}
bool IsAlive(Java.Lang.Object @object)
{
if (@object == null)
return false;
if (@object.Handle == IntPtr.Zero)
return false;
if (@object is Activity activity)
{
if (activity.IsFinishing)
return false;
if (activity.IsDestroyed)
return false;
}
return true;
}
public Task<string> DisplayPromptAync(string title = null, string description = null,
string text = null, string okButtonText = null, string cancelButtonText = null,
bool numericKeyboard = false, bool autofocus = true, bool password = false)
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
if (activity == null)
{
return Task.FromResult<string>(null);
}
var alertBuilder = new AlertDialog.Builder(activity);
alertBuilder.SetTitle(title);
alertBuilder.SetMessage(description);
var input = new EditText(activity)
{
InputType = InputTypes.ClassText
};
if (text == null)
{
text = string.Empty;
}
if (numericKeyboard)
{
SetNumericKeyboardTo(input);
}
if (password)
{
input.InputType = InputTypes.TextVariationPassword | InputTypes.ClassText;
}
input.ImeOptions = input.ImeOptions | (ImeAction)ImeFlags.NoPersonalizedLearning |
(ImeAction)ImeFlags.NoExtractUi;
input.Text = text;
input.SetSelection(text.Length);
var container = new FrameLayout(activity);
var lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MatchParent,
LinearLayout.LayoutParams.MatchParent);
lp.SetMargins(25, 0, 25, 0);
input.LayoutParameters = lp;
container.AddView(input);
alertBuilder.SetView(container);
okButtonText = okButtonText ?? AppResources.Ok;
cancelButtonText = cancelButtonText ?? AppResources.Cancel;
var result = new TaskCompletionSource<string>();
alertBuilder.SetPositiveButton(okButtonText,
(sender, args) => result.TrySetResult(input.Text ?? string.Empty));
alertBuilder.SetNegativeButton(cancelButtonText, (sender, args) => result.TrySetResult(null));
var alert = alertBuilder.Create();
alert.Window.SetSoftInputMode(Android.Views.SoftInput.StateVisible);
alert.Show();
if (autofocus)
{
input.RequestFocus();
}
return result.Task;
}
public Task<ValidatablePromptResponse?> DisplayValidatablePromptAsync(ValidatablePromptConfig config)
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
if (activity == null)
{
return Task.FromResult<ValidatablePromptResponse?>(null);
}
var alertBuilder = new AlertDialog.Builder(activity);
alertBuilder.SetTitle(config.Title);
var view = activity.LayoutInflater.Inflate(Resource.Layout.validatable_input_dialog_layout, null);
alertBuilder.SetView(view);
var result = new TaskCompletionSource<ValidatablePromptResponse?>();
alertBuilder.SetOnCancelListener(new BasicDialogWithResultCancelListener(result));
alertBuilder.SetPositiveButton(config.OkButtonText ?? AppResources.Ok, listener: null);
alertBuilder.SetNegativeButton(config.CancelButtonText ?? AppResources.Cancel, (sender, args) => result.TrySetResult(null));
if (!string.IsNullOrEmpty(config.ThirdButtonText))
{
alertBuilder.SetNeutralButton(config.ThirdButtonText, (sender, args) => result.TrySetResult(new ValidatablePromptResponse(null, true)));
}
var alert = alertBuilder.Create();
var input = view.FindViewById<EditText>(Resource.Id.txtValue);
var lblHeader = view.FindViewById<TextView>(Resource.Id.lblHeader);
var lblValueSubinfo = view.FindViewById<TextView>(Resource.Id.lblValueSubinfo);
lblHeader.Text = config.Subtitle;
lblValueSubinfo.Text = config.ValueSubInfo;
var defaultSubInfoColor = lblValueSubinfo.TextColors;
input.InputType = InputTypes.ClassText;
if (config.NumericKeyboard)
{
SetNumericKeyboardTo(input);
}
input.ImeOptions = input.ImeOptions | (ImeAction)ImeFlags.NoPersonalizedLearning | (ImeAction)ImeFlags.NoExtractUi;
input.Text = config.Text ?? string.Empty;
input.SetSelection(config.Text?.Length ?? 0);
input.AfterTextChanged += (sender, args) =>
{
if (lblValueSubinfo.Text != config.ValueSubInfo)
{
lblValueSubinfo.Text = config.ValueSubInfo;
lblHeader.SetTextColor(defaultSubInfoColor);
lblValueSubinfo.SetTextColor(defaultSubInfoColor);
}
};
alert.Window.SetSoftInputMode(SoftInput.StateVisible);
alert.Show();
var positiveButton = alert.GetButton((int)DialogButtonType.Positive);
positiveButton.Click += (sender, args) =>
{
var error = config.ValidateText(input.Text);
if (error != null)
{
lblHeader.SetTextColor(ThemeManager.GetResourceColor("DangerColor").ToAndroid());
lblValueSubinfo.SetTextColor(ThemeManager.GetResourceColor("DangerColor").ToAndroid());
lblValueSubinfo.Text = error;
lblValueSubinfo.SendAccessibilityEvent(Android.Views.Accessibility.EventTypes.ViewFocused);
return;
}
result.TrySetResult(new ValidatablePromptResponse(input.Text, false));
alert.Dismiss();
};
return result.Task;
}
public void RateApp()
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
try
{
var rateIntent = RateIntentForUrl("market://details", activity);
activity.StartActivity(rateIntent);
}
catch (ActivityNotFoundException)
{
var rateIntent = RateIntentForUrl("https://play.google.com/store/apps/details", activity);
activity.StartActivity(rateIntent);
}
}
public string GetBuildNumber()
{
return Application.Context.ApplicationContext.PackageManager.GetPackageInfo(
Application.Context.PackageName, 0).VersionCode.ToString();
}
public bool SupportsFaceBiometric()
{
// only used by iOS
return false;
}
public Task<bool> SupportsFaceBiometricAsync()
{
// only used by iOS
return Task.FromResult(SupportsFaceBiometric());
}
public bool SupportsNfc()
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
var manager = activity.GetSystemService(Context.NfcService) as NfcManager;
return manager.DefaultAdapter?.IsEnabled ?? false;
}
public bool SupportsCamera()
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
return activity.PackageManager.HasSystemFeature(PackageManager.FeatureCamera);
}
public int SystemMajorVersion()
{
return (int)Build.VERSION.SdkInt;
}
public string SystemModel()
{
return Build.Model;
}
public Task<string> DisplayAlertAsync(string title, string message, string cancel, params string[] buttons)
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
if (activity == null)
{
return Task.FromResult<string>(null);
}
var result = new TaskCompletionSource<string>();
var alertBuilder = new AlertDialog.Builder(activity);
alertBuilder.SetTitle(title);
if (!string.IsNullOrWhiteSpace(message))
{
if (buttons != null && buttons.Length > 2)
{
if (!string.IsNullOrWhiteSpace(title))
{
alertBuilder.SetTitle($"{title}: {message}");
}
else
{
alertBuilder.SetTitle(message);
}
}
else
{
alertBuilder.SetMessage(message);
}
}
if (buttons != null)
{
if (buttons.Length > 2)
{
alertBuilder.SetItems(buttons, (sender, args) =>
{
result.TrySetResult(buttons[args.Which]);
});
}
else
{
if (buttons.Length > 0)
{
alertBuilder.SetPositiveButton(buttons[0], (sender, args) =>
{
result.TrySetResult(buttons[0]);
});
}
if (buttons.Length > 1)
{
alertBuilder.SetNeutralButton(buttons[1], (sender, args) =>
{
result.TrySetResult(buttons[1]);
});
}
}
}
if (!string.IsNullOrWhiteSpace(cancel))
{
alertBuilder.SetNegativeButton(cancel, (sender, args) =>
{
result.TrySetResult(cancel);
});
}
var alert = alertBuilder.Create();
alert.CancelEvent += (o, args) => { result.TrySetResult(null); };
alert.Show();
return result.Task;
}
public async Task<string> DisplayActionSheetAsync(string title, string cancel, string destruction,
params string[] buttons)
{
return await Microsoft.Maui.Controls.Application.Current.MainPage.DisplayActionSheet(
title, cancel, destruction, buttons);
}
public void OpenAccessibilityOverlayPermissionSettings()
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
try
{
var intent = new Intent(Settings.ActionManageOverlayPermission);
intent.SetData(Android.Net.Uri.Parse("package:com.x8bit.bitwarden"));
activity.StartActivity(intent);
}
catch (ActivityNotFoundException)
{
// can't open overlay permission management, fall back to app settings
var intent = new Intent(Settings.ActionApplicationDetailsSettings);
intent.SetData(Android.Net.Uri.Parse("package:com.x8bit.bitwarden"));
activity.StartActivity(intent);
}
catch
{
var alertBuilder = new AlertDialog.Builder(activity);
alertBuilder.SetMessage(AppResources.BitwardenAutofillGoToSettings);
alertBuilder.SetCancelable(true);
alertBuilder.SetPositiveButton(AppResources.Ok, (sender, args) =>
{
(sender as AlertDialog)?.Cancel();
});
alertBuilder.Create().Show();
}
}
public void OpenCredentialProviderSettings()
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
try
{
var pendingIntent = ICredentialManager.Create(activity).CreateSettingsPendingIntent();
pendingIntent.Send();
}
catch (ActivityNotFoundException)
{
var alertBuilder = new AlertDialog.Builder(activity);
alertBuilder.SetMessage(AppResources.BitwardenCredentialProviderGoToSettings);
alertBuilder.SetCancelable(true);
alertBuilder.SetPositiveButton(AppResources.Ok, (sender, args) =>
{
(sender as AlertDialog)?.Cancel();
});
alertBuilder.Create().Show();
}
}
public void OpenAccessibilitySettings()
{
try
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
var intent = new Intent(Settings.ActionAccessibilitySettings);
activity.StartActivity(intent);
}
catch { }
}
public void OpenAutofillSettings()
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
try
{
var intent = new Intent(Settings.ActionRequestSetAutofillService);
intent.SetData(Android.Net.Uri.Parse("package:com.x8bit.bitwarden"));
activity.StartActivity(intent);
}
catch (ActivityNotFoundException)
{
var alertBuilder = new AlertDialog.Builder(activity);
alertBuilder.SetMessage(AppResources.BitwardenAutofillGoToSettings);
alertBuilder.SetCancelable(true);
alertBuilder.SetPositiveButton(AppResources.Ok, (sender, args) =>
{
(sender as AlertDialog)?.Cancel();
});
alertBuilder.Create().Show();
}
}
public long GetActiveTime()
{
// Returns milliseconds since the system was booted, and includes deep sleep. This clock is guaranteed to
// be monotonic, and continues to tick even when the CPU is in power saving modes, so is the recommend
// basis for general purpose interval timing.
// ref: https://developer.android.com/reference/android/os/SystemClock#elapsedRealtime()
return SystemClock.ElapsedRealtime();
}
public async Task ExecuteFido2CredentialActionAsync(AppOptions appOptions)
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
if (activity == null || string.IsNullOrWhiteSpace(appOptions.Fido2CredentialAction))
{
return;
}
if (appOptions.Fido2CredentialAction == CredentialProviderConstants.Fido2CredentialGet)
{
await ExecuteFido2GetCredentialAsync(appOptions);
}
else if (appOptions.Fido2CredentialAction == CredentialProviderConstants.Fido2CredentialCreate)
{
await ExecuteFido2CreateCredentialAsync();
}
// Clear CredentialAction and FromFido2Framework values to avoid erratic behaviors in subsequent navigation/flows
// For Fido2CredentialGet these are no longer needed as a new Activity will be initiated.
// For Fido2CredentialCreate the app will rely on IFido2MakeCredentialConfirmationUserInterface.IsConfirmingNewCredential
appOptions.Fido2CredentialAction = null;
appOptions.FromFido2Framework = false;
}
private async Task ExecuteFido2GetCredentialAsync(AppOptions appOptions)
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
if (activity == null)
{
return;
}
try
{
var request = AndroidX.Credentials.Provider.PendingIntentHandler.RetrieveBeginGetCredentialRequest(activity.Intent);
var response = new AndroidX.Credentials.Provider.BeginGetCredentialResponse();;
var credentialEntries = new List<AndroidX.Credentials.Provider.CredentialEntry>();
foreach (var option in request.BeginGetCredentialOptions.OfType<AndroidX.Credentials.Provider.BeginGetPublicKeyCredentialOption>())
{
credentialEntries.AddRange(await Bit.App.Platforms.Android.Autofill.CredentialHelpers.PopulatePasskeyDataAsync(request.CallingAppInfo, option, activity, appOptions.HasUnlockedInThisTransaction));
}
if (credentialEntries.Any())
{
response = new AndroidX.Credentials.Provider.BeginGetCredentialResponse.Builder()
.SetCredentialEntries(credentialEntries)
.Build();
}
var result = new Android.Content.Intent();
AndroidX.Credentials.Provider.PendingIntentHandler.SetBeginGetCredentialResponse(result, response);
activity.SetResult(Result.Ok, result);
activity.Finish();
}
catch (Exception ex)
{
Bit.Core.Services.LoggerHelper.LogEvenIfCantBeResolved(ex);
activity.SetResult(Result.Canceled);
activity.Finish();
}
}
private async Task ExecuteFido2CreateCredentialAsync()
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
if (activity == null) { return; }
try
{
var getRequest = AndroidX.Credentials.Provider.PendingIntentHandler.RetrieveProviderCreateCredentialRequest(activity.Intent);
await Bit.App.Platforms.Android.Autofill.CredentialHelpers.CreateCipherPasskeyAsync(getRequest, activity);
}
catch (Exception ex)
{
Bit.Core.Services.LoggerHelper.LogEvenIfCantBeResolved(ex);
activity.SetResult(Result.Canceled);
activity.Finish();
}
}
public void CloseMainApp()
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
if (activity == null)
{
return;
}
activity.Finish();
_messagingService.Send("finishMainActivity");
}
public bool SupportsFido2()
{
return true;
}
public bool SupportsCredentialProviderService() => Build.VERSION.SdkInt >= BuildVersionCodes.UpsideDownCake;
public bool SupportsAutofillServices() => Build.VERSION.SdkInt >= BuildVersionCodes.O;
public bool SupportsInlineAutofill() => Build.VERSION.SdkInt >= BuildVersionCodes.R;
public bool SupportsDrawOver() => Build.VERSION.SdkInt >= BuildVersionCodes.M;
private Intent RateIntentForUrl(string url, Activity activity)
{
var intent = new Intent(Intent.ActionView, Android.Net.Uri.Parse($"{url}?id={activity.PackageName}"));
var flags = ActivityFlags.NoHistory | ActivityFlags.MultipleTask;
if ((int)Build.VERSION.SdkInt >= 21)
{
flags |= ActivityFlags.NewDocument;
}
else
{
// noinspection deprecation
flags |= ActivityFlags.ClearWhenTaskReset;
}
intent.AddFlags(flags);
return intent;
}
public float GetSystemFontSizeScale()
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
return activity?.Resources?.Configuration?.FontScale ?? 1;
}
public async Task OnAccountSwitchCompleteAsync()
{
// for any Android-specific cleanup required after switching accounts
}
public async Task SetScreenCaptureAllowedAsync()
{
var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
if (await _stateService.GetScreenCaptureAllowedAsync())
{
activity.RunOnUiThread(() => activity.Window.ClearFlags(WindowManagerFlags.Secure));
return;
}
activity.RunOnUiThread(() => activity.Window.AddFlags(WindowManagerFlags.Secure));
}
public void OpenAppSettings()
{
var intent = new Intent(Android.Provider.Settings.ActionApplicationDetailsSettings);
intent.AddFlags(ActivityFlags.NewTask);
var uri = Android.Net.Uri.FromParts("package", Application.Context.PackageName, null);
intent.SetData(uri);
Application.Context.StartActivity(intent);
}
public void CloseExtensionPopUp()
{
// only used by iOS
throw new NotImplementedException();
}
public string GetAutofillAccessibilityDescription()
{
if (Build.VERSION.SdkInt <= BuildVersionCodes.LollipopMr1)
{
return AppResources.AccessibilityDescription;
}
if (Build.VERSION.SdkInt <= BuildVersionCodes.M)
{
return AppResources.AccessibilityDescription2;
}
if (Build.VERSION.SdkInt <= BuildVersionCodes.NMr1)
{
return AppResources.AccessibilityDescription3;
}
return AppResources.AccessibilityDescription4;
}
public string GetAutofillDrawOverDescription()
{
if (Build.VERSION.SdkInt <= BuildVersionCodes.M)
{
return AppResources.DrawOverDescription;
}
if (Build.VERSION.SdkInt <= BuildVersionCodes.NMr1)
{
return AppResources.DrawOverDescription2;
}
return AppResources.DrawOverDescription3;
}
private void SetNumericKeyboardTo(EditText editText)
{
editText.InputType = InputTypes.ClassNumber | InputTypes.NumberFlagDecimal | InputTypes.NumberFlagSigned;
#pragma warning disable CS0618 // Type or member is obsolete
editText.KeyListener = DigitsKeyListener.GetInstance(false, false);
#pragma warning restore CS0618 // Type or member is obsolete
}
}
class BasicDialogWithResultCancelListener : Java.Lang.Object, IDialogInterfaceOnCancelListener
{
private readonly TaskCompletionSource<ValidatablePromptResponse?> _taskCompletionSource;
public BasicDialogWithResultCancelListener(TaskCompletionSource<ValidatablePromptResponse?> taskCompletionSource)
{
_taskCompletionSource = taskCompletionSource;
}
public void OnCancel(IDialogInterface dialog)
{
_taskCompletionSource?.TrySetResult(null);
dialog?.Dismiss();
}
}
}