...is it possible to create or do you already have any code for custom library projects?

Yes, it is possible to create custom library project. I will start this by creating a simple project by using Crosslight Blank project template. Next, I added an Android Library Project, called as MyAndroidCustomLibrary, to the solution.

Within MyAndroidCustomLibrary, a layout - MyCustomLayout.axml - is added. It is a very simple layout with text.
Following references are added into MyAndroidCustomLibrary project:

• Intersoft.Crosslight;
• Intersoft.Crosslight.Android;
• assembly reference from the Core project of the solution.

An Activity called CustomActivity is added. Following snippet code shows the declaration of the CustomActivity class.

[Activity(Label = "CustomActivity")]
[ImportBinding(typeof(CustomBindingProvider))]
public class CustomActivity : Activity<CustomViewModel>
{
    public CustomActivity()
        :base(Resource.Layout.MyCustomLayout){

    }
}

In the Android project of the solution, a reference from MyAndroidCustomLibrary project is added. Add following code into the InitializeService method of AppInitializer class in the Android project in order to be able to consume the CustomActivity.

public void InitializeServices(IApplicationHost appHost)
{
    IApplicationService applicationService = ServiceProvider.GetService<IApplicationService>();
            
    if (applicationService != null)
    {
        applicationService.GetContext().AddExportedType(typeof(CustomActivity));
    }
}

CustomViewModel is added. What will this ViewModel do is quite simple, to assign Text property with a string: "From Custom Activity" in the contructor.

private string _text;

public string Text
{
    get { return _text; }
    set
    {
        if (_text != value)
        {
            _text = value;
            this.OnPropertyChanged("Text");
        }
    }
}

public CustomViewModel()
{
    this.Text = "From Custom Activity";
}

I also add CustomBindingProvider like the following snippet code.

public CustomBindingProvider()
{
    this.AddBinding("TestText", BindableProperties.TextProperty, "Text");
}

Last, I modify the ShowToast command so that when user press Button1 it will navigate to CustomViewModel

Please find CrosslightCustomLibrary.zip file in the attachment for more detail information.

When trying on my own, I missed the "InitializeServices" step.

Is it possible to use the "Resource.Layout.MyCustomLayout" layout in the Android project created by Crosslight? Which means, can I create resources in the custom library and use them in the Crosslight project?

Does the scenario still work when I have a custom core, too?

Thanks,

Thomas

Is it possible to use the "Resource.Layout.MyCustomLayout" layout in the Android project created by Crosslight? Which means, can I create resources in the custom library and use them in the Crosslight project?

Open the targeted activity and override ContentLayoutId. Following snippet code shows how to do this in the sample CrosslightCustomLibrary.

protected override int ContentLayoutId
{
    get
    {
        return MyAndroidCustomLibrary.Resource.Layout.MyCustomLayout;
    }
}

This should help.