Dismiss keyboard from view model in MVVMCross in Xamarin Android - xamarin

Question

I have a textview and a button on screen. User taps on the text view which shows up keyboard, user types some text and then clicks on the button whose onclick is bound to a command defined in the view model.
I want to dismiss keyboard from view model by sending a message or calling a method in the view but still want to keep loose coupling between view and view model. I see mvvmmessenger, mvxinteraction etc to accomplish this. What is the best way to handle this?

Answer 1

Don't know if this is the best way to handle this, but hopefully the way i did it can help you out.
I made an interface called IPlatformAction in the Core project, which implements a method called DismissKeyboard.
public interface IPlatformAction
{
void DismissKeyboard();
}
Then I made a service called PlatformActionService in the Droid project, that implements that interface.
public class PlatformService : IPlatformAction
{
protected Activity CurrentActivity =>
Mvx.IoCProvider.Resolve<IMvxAndroidCurrentTopActivity>().Activity;
public void DismissKeyboard()
{
var currentFocus = CurrentActivity.CurrentFocus;
if (currentFocus != null)
{
InputMethodManager inputMethodManager = (InputMethodManager)CurrentActivity.GetSystemService(Context.InputMethodService);
inputMethodManager.HideSoftInputFromWindow(currentFocus.WindowToken, HideSoftInputFlags.None);
}
}
}
Lastly, I inject the interface in the viewmodel and call the dismiss keyboard method
public class SomeViewModel : BaseViewModel<SomeModel>
{
private readonly IPlatformAction _platformAction;
public SomeViewModel(IPlatformAction platformAction)
{
_platformAction = platformAction;
}
public async Task DoSomething()
{
//Some code
_platformAction.DismissKeyboard();
}
}