java Xamarin MAUI无活动管理安全异常（Kiosk模式应用程序）

Question

我正在尝试在安卓 emulator上运行一个应用程序，使用全信息亭模式。 所以我写了一个DeviceAdminReceiver：

public class AdminReceiver : DeviceAdminReceiver
{

    public override void OnEnabled(Context context, Intent intent)
    {
        base.OnEnabled(context, intent);
        Log.Info("Device Admin: ", "Enabled");
    }

    public override void OnDisabled(Context context, Intent intent)
    {
        base.OnDisabled(context, intent);
        Log.Info("Device Admin: ", "Disabled");
    }
}

以下是主要活动：

[Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize)]
[IntentFilter(new[] { Intent.ActionMain }, Categories = new[] { Intent.CategoryHome, Intent.CategoryDefault })]
public class MainActivity : MauiAppCompatActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        SetFullscreenFlags();
        var devicePolicyManager = (DevicePolicyManager)GetSystemService(Context.DevicePolicyService);
        var deviceAdminComponent = new ComponentName(this, Java.Lang.Class.FromType(typeof(AdminReceiver)));
        var intent = new Intent(DevicePolicyManager.ActionAddDeviceAdmin);
        intent.PutExtra(DevicePolicyManager.ExtraDeviceAdmin, deviceAdminComponent);
        intent.PutExtra(DevicePolicyManager.ExtraAddExplanation, "Device administrator");
        StartActivity(intent);
        
        devicePolicyManager.SetLockTaskPackages(deviceAdminComponent, new[] { PackageName });
        StartLockTask();
       
    }

private void SetFullscreenFlags()
    {
        Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);

        if (Build.VERSION.SdkInt >= BuildVersionCodes.R)
        {
            Window.SetDecorFitsSystemWindows(true);
            var controller = Window.InsetsController;
            if (controller is not null)
            {
                controller.Hide(WindowInsets.Type.StatusBars() | WindowInsets.Type.NavigationBars());
            }
        }
        else
        {
            Window.DecorView.SystemUiVisibility = (StatusBarVisibility)
                                     (SystemUiFlags.LowProfile
                                     | SystemUiFlags.Fullscreen
                                     | SystemUiFlags.LayoutFullscreen
                                     | SystemUiFlags.HideNavigation
                                     | SystemUiFlags.LayoutHideNavigation
                                     | SystemUiFlags.Immersive
                                     | SystemUiFlags.ImmersiveSticky);
        }
    }

最后是AndroidManifest。xml:

<uses-sdk 安卓:minSdkVersion="21" 安卓:targetSdkVersion="30" />
<application 安卓:allowBackup="true" 安卓:icon="@mipmap/appicon" 安卓:roundIcon="@mipmap/appicon_round" 安卓:supportsRtl="true">
    <receiver
        安卓:name=".AdminReceiver"
        安卓:permission="安卓.permission.BIND_DEVICE_ADMIN">
        <meta-data
            安卓:name="安卓.app.device_admin"
            安卓:resource="@xml/device_admin" />
        <intent-filter>
            <action 安卓:name="安卓.app.action.DEVICE_ADMIN_ENABLED" />
            <action 安卓:name="安卓.app.action.DEVICE_ADMIN_DISABLED" />
        </intent-filter>
    </receiver>
    <receiver 安卓:name=".BootReceiver">
        <intent-filter>
            <action 安卓:name="安卓.intent.action.PROFILE_PROVISIONING_COMPLETE"/>
            <action 安卓:name="安卓.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </receiver>
</application>

>；

问题是MainActivity中的这一行引发了以下异常：

devicePolicyManager.SetLockTaskPackages(deviceAdminComponent, new[] { PackageName });

Java.Lang.SecurityException: 'No active admin ComponentInfo{com.companyName.TestApp/crc6463b464086cdcaa12.AdminReceiver}'

我已经有一个设备管理员了。xml在resources/xml中带有设备管理员标签，是否需要更多配置？或者问题在哪里？ 或者我在举例说明两个不同的管理接收器

注： 我已经在emulator上执行了允许该应用作为设备管理员的过程，并通过安卓调试桥运行命令，将其设置为设备所有者：

dpm set-device-owner com.companyName.TestApp/.AdminReceiver