Реализация для Android

Листинг 11.21. Для Android тоже ничего необычного

[assembly: Dependency(typeof(AndroidVkService))]

namespace Login.Droid

{

public class AndroidVkService : Java.Lang.Object, IVkService { public static AndroidVkService Instance => DependencyService. Get<IVkService>() as AndroidVkService;

readonly string[] _permissions = { VKScope.Email, VKScope.Offline };

TaskCompletionSource<LoginResult> _completionSource; LoginResult _loginResult;

public Task<LoginResult> Login() { _completionSource = new TaskCompletionSource<LoginResult>(); VKSdk.Login(Forms.Context as Activity, _permissions); return _completionSource.Task; }

public void Logout() { _loginResult = null; _completionSource = null; VKSdk.Logout(); }

public void SetUserToken(VKAccessToken token) { _loginResult = new LoginResult { Email = token.Email, Token = token.AccessToken, UserId = token.UserId, ExpireAt = Utils.FromMsDateTime(token.ExpiresIn) };

Авторизация с помощью Facebook, ВКонтакте и OAuth

Task.Run(GetUserInfo); }

async Task GetUserInfo() { var request = VKApi.Users.Get(VKParameters.From(VKApiConst.Fields, @"photo_400_orig,")); var response = await request.ExecuteAsync(); var jsonArray = response.Json.OptJSONArray(@"response"); var account = jsonArray?.GetJSONObject(0); if (account != null && _loginResult != null) { _loginResult.FirstName = account.OptString(@"first_name"); _loginResult.LastName = account.OptString(@"last_name"); _loginResult.ImageUrl = account.OptString(@"photo_400_orig"); _loginResult.LoginState = LoginState.Success; SetResult(_loginResult); }

else

SetErrorResult(@"Unable to complete the request of user info"); }

public void SetErrorResult(string errorMessage) { SetResult(new LoginResult { LoginState = LoginState.Failed, ErrorString = errorMessage }); }

public void SetCanceledResult() { SetResult(new LoginResult { LoginState = LoginState.Canceled }); }

void SetResult(LoginResult result) { _completionSource?.TrySetResult(result); _loginResult = null; _completionSource = null; } } }