Package Google.Android.Material.Slider missing AddOnChangeListener()

[luraze]

Using latest package of Xamarin.Google.Android.Material (1.4.0.4). Slider has ClearOnChangeListener(), but missing AddOnChangeListener(). Maybe mapping needs to be based on newer version of material package?

Thanks.

Edit:
Ok, I found this post that seems to work: https://stackoverflow.com/questions/67723339/how-to-implement-google-android-material-slider-changelistener-or-addonchangelis

[jpobst]

Ugh, this one is a mess. According to the public documentation Slider is defined like this:

public class Slider extends View {
  public void addOnChangeListener (L listener) { ... }
}

One may be wondering what L is because it isn't specified anywhere. That's because decompiling the .jar shows that the public documentation is lying:

public class Slider extends BaseSlider<Slider, Slider.OnChangeListener, Slider.OnSliderTouchListener> 
{
 ...
}

abstract class BaseSlider<S extends BaseSlider<S, L, T>, L extends BaseOnChangeListener<S>, T extends BaseOnSliderTouchListener<S>> extends View 
{
  public void addOnChangeListener(@NonNull L listener) { ... }
}

That is, the public Slider class inherits from the private BaseSlider class, which isn't allowed in C#. Our tooling attempts to fix this and have Slider inherit from the public View instead, and copy all the methods that it can from the BaseSlider class directly into the Slider class.

However, due to the lack of generics support in our tooling, it is unable to copy the addOnChangeListener method which requires a generic parameter. Thus this method is dropped from the binding:

warning BG8800: Unknown parameter type 'L' for member 'Google.Android.Material.Slider.Slider.AddOnChangeListener (L)'.

I would suggest continuing to use the workaround listed in the issue description.

[jpobst]

Closing as duplicate of #230.