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Android: Creating a View class and setting it as the content view for the root activity crashes the Workbooks app

terrencejames opened this issue · comments

commented

I have something like

public class SampleView : Android.Views.View
{
    LinearLayout _layout;
    public SampleView(Context context) : base(context)
    {
        _layout = new LinearLayout(context);
        _layout.SetBackgroundColor(Color.Green);
    }   
}
Activity mainActivity = StartedActivities.First();
mainActivity.SetContentView(new SampleView(mainActivity));

I then got this error under the code block:
image

I thought I was doing something wrong, so I opened up the 2D-drawing.workbook example and I am also unable to run it as is:

image

HOWEVER, doing something like

var rootActivity = StartedActivities.First ();
var layout = new LinearLayout(rootActivity);
layout.SetBackgroundColor(Android.Graphics.Color.Aqua);
rootActivity.SetContentView(layout);

works perfectly fine.

I'm running Version 1.5 on an Android Oreo emulator.

commented

Subclassing most Android types in a Workbook is impossible at this time (and for the foreseeable future). I'm sorry for the trouble. We understand this is a major missing feature for Android workbooks.

Previous discussions:

There is a lot of tooling work that happens in Xamarin.Android when you subclass a Java type. Java files have to be generated at build time. Doing this in a live Android app is not something we can currently support, and I am not aware of any workaround to make this work in Workbooks.

commented

Thanks for the speedy reply @sandyarmstrong

Subclassing most Android types in a Workbook is impossible at this time (and for the foreseeable future). I'm sorry for the trouble. We understand this is a major missing feature for Android workbooks.

Previous discussions:

There is a lot of tooling work that happens in Xamarin.Android when you subclass a Java type. Java files have to be generated at build time. Doing this in a live Android app is not something we can currently support, and I am not aware of any workaround to make this work in Workbooks.