验证时 Xamarin Android 应用程序错误

Question

我正在尝试向我的 Xamarin Android 应用程序添加身份验证。我使用以下内容作为指导：https://github.com/azure-samples/active-directory-xamarin-native-v2#integrate-microsoft-identity-and-the-microsoft-graph-into-a-xamarin-forms-app-using-msal

当我尝试从 Visual Studio 在 Android 模拟器中运行该示例时，它运行良好：它会弹出一个登录页面，完成后返回到应用程序。但是，当我尝试在我的应用程序中执行相同操作时，应用程序会中断外部代码（我在 Visual Studio 中看到“应用程序处于中断模式”页面）。

在下面的代码中，MainActivity 中的 OnActivityResult 被调用（我有一个断点），但是控制永远不会返回到 ContinuousScanPage 中 AcquireTokenInteractive 之后的行。

相关部分代码如下（为简洁起见，已删除无关代码）：

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    protected async override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        Xamarin.Essentials.Platform.Init(this, savedInstanceState);
        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
        App.ParentWindow = this;
        LoadApplication(new App());
    }

    protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
    {
        base.OnActivityResult(requestCode, resultCode, data);
        AuthenticationContinuationHelper.SetAuthenticationContinuationEventArgs(requestCode, resultCode, data);
    }
}

App.xaml.cs

public partial class App : Application
{
    private string _deviceId;

    public string DeviceId { get => _deviceId; internal set => _deviceId = value; }
    public IPublicClientApplication PCA { get; set; } = null;
    public static object ParentWindow { get; set; }
    public string AccessToken { get; set; }

    public App()
    {
        Settings settings = Settings.Get<Settings>();

        InitializeComponent();
        DeviceId = CrossDeviceInfo.Current.Id;

        PCA = PublicClientApplicationBuilder.Create(settings.AuthClientId)
            .WithRedirectUri($"msal{settings.AuthClientId}://auth")
            .Build();

        MainPage = new NavigationPage(new Pages.ContinuousScanPage(CaptureType.MusterIn));
    }
}

ContinuousScanPage.xaml.cs

[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class ContinuousScanPage : ContentPage
{
    private readonly App _app;

    public CaptureType CaptureType { get; }

    public ContinuousScanPage(CaptureType captureType)
    {
        CaptureType = captureType;

        InitializeComponent();
        _app = (App)Application.Current;
     }

    public static bool IsPageFirstLoad = true;
    protected override async void OnAppearing()
    {
        if (IsPageFirstLoad)
        {
            IsPageFirstLoad = false;
            await SignIn();
            BindingContext = this;
        }

        base.OnAppearing();
    }

    private async Task SignIn()
    {
        Settings settings = Settings.Get<Settings>();

        AuthenticationResult authResult = null;
        IEnumerable<IAccount> accounts = await _app.PCA.GetAccountsAsync();
        try
        {
            IAccount firstAccount = accounts.FirstOrDefault();
            authResult = await _app.PCA.AcquireTokenSilent(settings.AuthScope, firstAccount).ExecuteAsync();
            await RefreshUserDataAsync(authResult.AccessToken);
        }
        catch (MsalUiRequiredException)
        {
            authResult = await _app.PCA.AcquireTokenInteractive(settings.AuthScope)
                .WithParentActivityOrWindow(App.ParentWindow)
                .ExecuteAsync();
            await RefreshUserDataAsync(authResult.AccessToken);
        }
    }

    public async Task RefreshUserDataAsync(string token)
    {
        _app.AccessToken = token;

    }
}

Answer 1

除了使用您的 clientId 和 redirectUri 更新应用程序之外，您还必须确保 Android 清单中包含以下内容：

<activity android:name="microsoft.identity.client.BrowserTabActivity">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="msal{client_id}" android:host="auth" />
         </intent-filter>
</activity>

在android:scheme 中，您需要包含您的clientId。希望这能解决您的问题（将清单中的 client_id 替换为您自己的）