【发布时间】：2019-11-17 22:56:49
【问题描述】：
一段时间以来，我一直在使用 ADAL 库在我的 Xamarin Android 应用程序中对用户进行身份验证，这一切正常。但是在 Azure 中为后端 API 启用条件访问后，我必须使用代理来完成这项工作。我遵循了 ADAL Wiki (https://github.com/AzureAD/azure-activedirectory-library-for-dotnet/wiki/leveraging-brokers-on-Android-and-iOS) 上的所有说明，但仍然没有找到工作情况。
Xamarin 表单 ADAL 版本：5.2.4
下面是我用来验证用户的代码：
public async Task<AuthenticationResult> Authenticate(string authority, string resource, string clientId, string returnUri)
{
var context = new AuthenticationContext(authority);
var param = new PlatformParameters(CrossCurrentActivity.Current.Activity, true, PromptBehavior.SelectAccount);
if (context.TokenCache.ReadItems().Count() > 0)
context = new AuthenticationContext(context.TokenCache.ReadItems().First().Authority);
try
{
authResult = await context.AcquireTokenAsync(resource, clientId, new Uri(returnUri), param, userId).ConfigureAwait(false);
return authResult;
}
catch
{
return null;
}
}
在 MainActivity 我添加了以下内容：
protected override void OnResume()
{
base.OnResume();
if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.GetAccounts) == (int)Android.Content.PM.Permission.Granted)
{
enablingBrokerSupport();
}
}
private void enablingBrokerSupport()
{
const string WORK_AND_SCHOOL_TYPE = "com.microsoft.workaccount";
var accManager = AccountManager.Get(Application.Context);
Account[] accounts = accManager.GetAccountsByType(WORK_AND_SCHOOL_TYPE);
Intent intent = AccountManager.NewChooseAccountIntent(null, null, new[] { WORK_AND_SCHOOL_TYPE }, null, null, null, null);
CrossCurrentActivity.Current.Activity.StartActivityForResult(intent, 999);
accManager.GetAccountsByType(WORK_AND_SCHOOL_TYPE);
}
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
{
Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
AuthenticationAgentContinuationHelper.SetAuthenticationAgentContinuationEventArgs(requestCode, resultCode, data);
}
启动应用程序后，它首先提示 GetAccunts 权限（如预期的那样）。授予权限后，它将显示显示我的帐户的帐户选择器。假设它是从经纪人那里获取帐户，那么所有必要的代码都必须按照我的理解正确实施。
我可以在调试控制台中看到以下错误：
[MonoDroid] UNHANDLED EXCEPTION:
[MonoDroid] System.NullReferenceException: Object reference not set to an instance of an object
[MonoDroid] at Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationAgentContinuationHelper.SetAuthenticationAgentContinuationEventArgs (System.Int32 requestCode, Android.App.Result resultCode, Android.Content.Intent data) [0x0001c] in <41e5a54c101e43dca8a2f462dab041fa>:0
[MonoDroid] at ADALTest.Droid.MainActivity.OnActivityResult (System.Int32 requestCode, Android.App.Result resultCode, Android.Content.Intent data) [0x00009] in :0
[MonoDroid] at Android.App.Activity.n_OnActivityResult_IILandroid_content_Intent_ (System.IntPtr jnienv, System.IntPtr native__this, System.Int32 requestCode, System.Int32 native_resultCode, System.IntPtr native_data) [0x00014] in :0
[MonoDroid] at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.6(intptr,intptr,int,int,intptr)
[DALTes] JNI RegisterNativeMethods: attempt to register 0 native methods for android.runtime.JavaProxyThrowable
[AndroidRuntime] Shutting down VM
[AndroidRuntime] FATAL EXCEPTION: main
[AndroidRuntime] Process: <my_packageid>, PID: 23545
[AndroidRuntime] android.runtime.JavaProxyThrowable: System.NullReferenceException: Object reference not set to an instance of an object
[AndroidRuntime] at Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationAgentContinuationHelper.SetAuthenticationAgentContinuationEventArgs (System.Int32 requestCode, Android.App.Result resultCode, Android.Content.Intent data) [0x0001c] in <41e5a54c101e43dca8a2f462dab041fa>:0
[AndroidRuntime] at ADALTest.Droid.MainActivity.OnActivityResult (System.Int32 requestCode, Android.App.Result resultCode, Android.Content.Intent data) [0x00009] in :0
[AndroidRuntime] at Android.App.Activity.n_OnActivityResult_IILandroid_content_Intent_ (System.IntPtr jnienv, System.IntPtr native__this, System.Int32 requestCode, System.Int32 native_resultCode, System.IntPtr native_data) [0x00014] in :0
[AndroidRuntime] at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.6(intptr,intptr,int,int,intptr)
[AndroidRuntime] at md5b4882cfeb0ca027f9661a63d1a4e24bc.MainActivity.n_onActivityResult(Native Method)
[AndroidRuntime] at md5b4882cfeb0ca027f9661a63d1a4e24bc.MainActivity.onActivityResult(MainActivity.java:65)
[AndroidRuntime] at android.app.Activity.dispatchActivityResult(Activity.java:7762)
[AndroidRuntime] at android.app.ActivityThread.deliverResults(ActivityThread.java:4603)
[AndroidRuntime] at android.app.ActivityThread.handleSendResult(ActivityThread.java:4652)
[AndroidRuntime] at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:49)
[AndroidRuntime] at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
[AndroidRuntime] at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
[AndroidRuntime] at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1948)
[AndroidRuntime] at android.os.Handler.dispatchMessage(Handler.java:106)
[AndroidRuntime] at android.os.Looper.loop(Looper.java:214)
[AndroidRuntime] at android.app.ActivityThread.main(ActivityThread.java:7050)
[AndroidRuntime] at java.lang.reflect.Method.invoke(Native Method)
[AndroidRuntime] at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
[AndroidRuntime] at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:965)
感谢任何帮助。
【问题讨论】：
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有任何更新吗？您现在解决问题了吗？
标签： xamarin.forms xamarin.android adal