Hi William,

I'm sure that you're already aware that each ViewModel represents a View, in this case, the Fragment is the View that consumes that your ViewModel.

So basically, in the ViewModel, you may call your custom service in the following fashion:

ICustomService customService = ServiceProvider.GetService<ICustomService>();if (customService != null){
customService.SetOwner(this);
customService.ExecuteCustomMethod();
}

 So, in your custom Android service, you can obtain the Context in the following fashion:

Context context = this.DispatchContext(this.Owner);

This is the whole key to the process. In Android, the Context object can be of three types: Activity, Fragment, or Global Application Context. Since you've associated the ViewModel to the Fragment, you've actually obtained the Fragment in the Context object, so you can easily safe-cast it to execute your public method in the Fragment.

MyFragment fragment = context as MyFragment;
if (fragment != null)
{
fragment.ExecuteMyPublicMethod();
}

Hope this helps. 

Hello,

Sorry I didn't mention the Fragment class is inherited "Intersoft.Crosslight.Android.Fragment<customViewModel>". Error message "Cannot convert type 'customViewModel' to 'Intersoft.Crosslight.Android.Fragment<Prototype.Ems.ViewModels.customViewModel>' via a reference conversion, boxing conversion, unboxing conversion, wrapping conversion, or null type conversion" occurred when I use safe-cast statment on design time. 

It's ok when I code below:

customViewModel context = Owner as customViewModel;

It seemed error when I code below on runtime:

customViewModel context = Owner as customViewModel;

Fragment<customViewModel> customFragment = context.Context as Fragment<customViewModel>;

I still can't grab the Fragment<customViewModel> to start my Android AnimationDrawable object, thank you very much.

Please try to use following snippet code to execute method in Android Fragment.

MyFragment fragment = AndroidUtility.GetViewContext(this.Owner as IViewModel) as MyFragment;
            
if (fragment != null)
    fragment.DoSomethingInFragment();

Hope this helps.

Glad to hear that the snippet code helps.

Should you need further assistance or run into any problems regarding our controls, feel free to post it into our forum. We would be happy to assist you again.