Xamarin Plugin.Permission. Error on requesting permission

Question

I'm trying to grand permissions to my android application using Plugin.Permissions and Xamarin.Forms

I'm following the provided sample, but I'm getting the following error:

04-10 17:42:09.234 I/MonoDroid(15633): UNHANDLED EXCEPTION:
04-10 17:42:09.234 I/MonoDroid(15633): System.MissingMethodException: Method not found: Android.App.Activity Xamarin.Essentials.Platform.get_CurrentActivity()
04-10 17:42:09.234 I/MonoDroid(15633):   at TestApp.Views.MainPage.OnButtonClicked (System.Object sender, System.EventArgs e) [0x000c3] in C:\projects\my\android-projects\TestXamarin\TestXamarinProject\TestApp\TestApp\Views\MainPage.xaml.cs:31 
04-10 17:42:09.234 I/MonoDroid(15633):   at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2019-10/android/release/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021 
04-10 17:42:09.234 I/MonoDroid(15633):   at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0 () [0x00000] in <4ccdb3137d974856b786e1aeebbfbab6>:0 
04-10 17:42:09.234 I/MonoDroid(15633):   at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <4ccdb3137d974856b786e1aeebbfbab6>:0 
04-10 17:42:09.235 I/MonoDroid(15633):   at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00009] in <4ccdb3137d974856b786e1aeebbfbab6>:0 
04-10 17:42:09.235 I/MonoDroid(15633):   at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.44(intptr,intptr)

Here is my MainActivity:

using Android.App;
using Android.Content.PM;
using Android.Runtime;
using Android.OS;
using Plugin.Permissions;

namespace ExoPlayerVU.Droid
{
    [Activity(Label = "TestApp", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;

            base.OnCreate(savedInstanceState);

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

        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Permission[] grantResults)
        {
            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
            PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);

            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
}

I'm requesting the permission on button click from MainPage.xaml.cs:

public async void OnButtonClicked(object sender, EventArgs e)
{
    var status = await CrossPermissions.Current.CheckPermissionStatusAsync<StoragePermission>();
    if (status != PermissionStatus.Granted)
    {
        // The error occurs here 
        if (await CrossPermissions.Current.ShouldShowRequestPermissionRationaleAsync(Permission.Storage))
        {
            await DisplayAlert("Access needed", "This application uses storage", "OK");
        }

        status = await CrossPermissions.Current.RequestPermissionAsync<StoragePermission>();
    }

    if (status == PermissionStatus.Granted)
    {
        // my logic
    }
    else
    {
        await DisplayAlert("Storage access denied", "Can not continue, try again.", "OK");
    }
}

The Plugin.Permissions and Xamarin.Essentials version are the latest. What I'm doing wrong?

Thanks in advance

UPDATE AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.testapp" android:installLocation="auto">
    <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="29" />
    <application android:label="TestApp.Android"></application>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <uses-permission android:name="android.permission.READ_PROFILE" />
    <uses-permission android:name="android.permission.WRITE_PROFILE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
</manifest>

UPDATE 2

Also I have the application class:

[Application]
public class DemoApplication : Application
{
    // ...

    public PlayerApplication(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
    {
    }

    public PlayerApplication()
    {
    }

    public override void OnCreate()
    {
        base.OnCreate();
        userAgent = Util.GetUserAgent(this, "TestApp");
        // Tried to initialize here, but also doesn't work
        //CrossCurrentActivity.Current.Init(this);
        //Xamarin.Essentials.Platform.Init(this);
    }

    // ...
}

Xamarin Version: 16.5

Xamarin.Android SDK: 10.2

Nugets:

Xamarin.Forms: 4.4

Xamarin.Essentials: 1.5.2

@NitikaFedorov, I tested same it works fine at my end.Can I know version of Xamarin Forms at testing device which you're using? — sandeep singh
@NitikaFedorov, unable to produce issue, can you share code? — sandeep singh

Jack Hua Jack Hua · Accepted Answer · 2020-04-13T07:28:31

Please make sure that the version of Xamarin.Essentials is 1.5.2 in all your projects, here is a screenshot:

I use a lower version in xxx.Android project before and get the same exception with you.

I also uploaded a sample project here and you can check it.

Xamarin Plugin.Permission. Error on requesting permission

1 Answers