Mvvmcross Android Viewstub

Question

I recently found a class called ViewStub that can be used to 'lazy-load' a layout-resource. The usage is very straight forward: In the layout file I use:

Solution 1:

After crawling through various mvvmcross-sources, I found a solution that seems to work. I'm not shure if thats the way how it should be done, so if someone has a better approach, please tell me.

How it works for now:

using (new MvxBindingContextStackRegistration<IMvxAndroidBindingContext>((IMvxAndroidBindingContext)this.BindingContext))
{
    var stub = this.FindViewById<ViewStub>(Resource.Id.content_stub);
    stub.LayoutInflater = this.LayoutInflater;
    stub.LayoutResource = Resource.Layout.FirstView;
    stub.Inflate();
}

Solution 2:

I had to do something similar, but the differences are just large enough that I thought I'd post a separate answer in case it's useful for anyone. I have a spinner, and based on the selection in that spinner a different "chunk" of UI is displayed. This leverages ViewStub's ability to automatically inflate the first time the Visibility is set to Visible.

Per the suggestion above, I made it an extension method:

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publicstaticvoidSetViewStubVisibilityAndInflate(this View view, MvxFragment fragment, ViewStates visibility)
{
    if (view is ViewStub && visibility == ViewStates.Visible)
    {
        var stub = (ViewStub)view;
        using (new MvxBindingContextStackRegistration<IMvxAndroidBindingContext>((IMvxAndroidBindingContext)fragment.BindingContext))
        {
            stub.LayoutInflater = fragment.Activity.LayoutInflater;
            stub.Inflate();
        }
    }

    view.Visibility = visibility;
}

And here's the code in my UI (which could be cleaner...):

private void SetCurveInputsVisibility(View view)
{
    var std = view.FindViewById(Resource.Id.CurveTypeStandard);
    var stdVis = (ViewModel.Values.CurveType == ServoCurveType.Standard ? ViewStates.Visible : ViewStates.Gone);
    std.SetViewStubVisibilityAndInflate(this, stdVis);

    var expo = view.FindViewById(Resource.Id.CurveTypeExpo);
    var expoVis = (ViewModel.Values.CurveType == ServoCurveType.Exponential ? ViewStates.Visible : ViewStates.Gone);
    expo.SetViewStubVisibilityAndInflate(this, expoVis);

    var custom = view.FindViewById(Resource.Id.CurveTypeCustom);
    var customVis = (ViewModel.Values.CurveType == ServoCurveType.Custom ? ViewStates.Visible : ViewStates.Gone);
    custom.SetViewStubVisibilityAndInflate(this, customVis);
}

Android Coder

Mvvmcross Android Viewstub

Solution 1:

Solution 2:

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