Android.Widget.ListView error in MAUI

Question

Android.Widget.ListView error in MAUI

vanKraster 201

Hi to all,

I am trying to render a Android.Widget.ListView in Android with MAUI and it is not working.
The error is : removeAllViews() is not supported in AdapterView
Same code in Xamarin Forms is working, Custom renderer of android


        protected override void OnElementChanged(ElementChangedEventArgs<DTWheelPicker> e)
        {
            base.OnElementChanged(e);
            if (e.NewElement == null)
            {
                return;
            }
            if (e.NewElement != null)
            {
                var inflater = (global::Android.Views.LayoutInflater)this.Context.GetSystemService(global::Android.App.Service.LayoutInflaterService);
                var layout = inflater.Inflate(Resource.Layout.wheelPicker, null).JavaCast<Android.Widget.ListView>();
                SetAdapter();
                SetNativeControl(layout);
            }
        }

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,166 Reputation points Microsoft External Staff

2023-05-10T02:22:33.4933333+00:00
For further investigation, could you please provide the following information?

Is the Android test environment you use to test MAUI and Xamarin the same?

What is Android Level for testing?

In MAUI, it is more recommended to use handler instead of renderer to implement custom controls, you could refer to Migrate a Xamarin.Forms custom renderer to a .NET MAUI handler. Would it help you solve this issue?

Your prompt reply will be highly appreciated.
vanKraster 201 Reputation points

2023-05-10T06:18:44.5566667+00:00
Hi Yonglun,

Is the Android test environment you use to test MAUI and Xamarin the same?

Yes

What is Android Level for testing?
I am testing on Android 13.0- API 33

In MAUI, it is more recommended to use handler instead of renderer to implement custom controls, you could refer to Migrate a Xamarin.Forms custom renderer to a .NET MAUI handler. Would it help you solve this issue?

I am aware of that change and I have rewrited some other components with handlres, but for this particular control it's challenging to do, so at the moment, the requirement is to copy and paste the code (with plans to rewrite it using handlers in the future). The good news is that Custom Renderers are working well for other components.
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,166 Reputation points Microsoft External Staff

2023-05-10T06:44:50.9766667+00:00

For Xamarin to migrate to Maui, did you try to migrate using the official plugin? Please refer to this official blog: Announcing a new version of the .NET Upgrade Assistant with support for .NET MAUI and Azure Functions!.

Will this issue occur after migrating with this plugin?

If so, could you please provide specific steps on how to reproduce this issue?

Your prompt reply will be highly appreciated.
vanKraster 201 Reputation points

2023-05-11T06:24:32.4+00:00
It is the same error with Migration plugin.
The steps are:

Create a custom control in MAUI

Create a custom renderer in Android

In the custom renderer on Android platform render a Android.Widget.Listview

It won't work, either you inflate a xml from layouts or create a new one from code the error is the same:
removeAllViews() is not supported in AdapterView
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,166 Reputation points Microsoft External Staff

2023-05-11T07:25:26.4466667+00:00

Thanks for your feedback.

For this issue, since only ListView will have this issue after migration, it is recommended that you publish it to MAUI - issues to make our product group aware of this.