Start MvxActivity from normal Activity?

Question

Particularly the Navigation between the Views over the ViewModels looks like that:

ShowViewModel<InfoViewModel>();

Or between normal Activities:

context.StartActivity(typeof(InfoActivity));

The problem I face now (actually I solved it in one of my latest projects by using Tinymessenger - its an event aggregator/messenger for loosely coupled communication) but I would like to know if theres an other way!

I'm creating an optionsmenu:

public abstract class BaseActivityWithoutTabs<T> : MvxActivity where T : class, IMvxViewModel
{
        public override bool OnCreateOptionsMenu(IMenu menu)
        {
            return ActivitiesHelper.CreateOptionsMenu(menu);
        }

        public override bool OnOptionsItemSelected(IMenuItem item)
        {
            return ActivitiesHelper.CreateOnOptionsItemSelectedEvent(item, this);
        }
}

InfoActivity derives from this BaseActivityWithoutTabs.

In the ActivitiesHelper Class (from above code) I'm creating the menu and the events:

public class ActivitiesHelper
{
    private const int einstellungenItemId = 0;
    private const int infoItemId = 1;

    public static bool CreateOptionsMenu(IMenu menu)
    {
        // GroupId, ItemId, OrderId
        menu.Add(0, einstellungenItemId, 0, "Einstellungen").SetIcon(Android.Resource.Drawable.IcMenuManage);
        menu.Add(0, infoItemId, 1, "Info").SetIcon(Android.Resource.Drawable.IcMenuInfoDetails);
        return true;
    }

    public static bool CreateOnOptionsItemSelectedEvent(IMenuItem item, Context context)
    {
        var id = item.ItemId + 1; // (Id is zero-based :)
        if (id == 1) // First Item
        {
            context.StartActivity(typeof(SettingsShowActivity));
        }
        else if (id == 2) // Second Item
        {
            context.StartActivity(typeof(InfoActivity)); //doesn't work...
        }
        return true;
    }
}

As you see I do here "StartActivity".. it works for the first "SettingsShowActivity" but thats an PreferenceActivity, so there no reason why it should fail. The problem is, that I would like to Start here the InfoActivity(as you see in code - Second Item) and this doesn't work. It opens the Activity but the List doesn't gets filled.

But if I go to a ViewModel in my project and call: ShowViewModel<InfoViewModel>();it works fine but this is on that place (in the ActivitiesHelper Class) not available/possible!

public class InfoViewModel : MvxViewModel
{
    public InfoViewModel()
    {
        Info info = new Info();
        info.Key = "ITS A KEYY";
        info.Value = "here we got a value";
        ObservableCollection<Info> asd = new ObservableCollection<Info>();
        asd.Add(info);
        Infos = asd;
    }

    private ObservableCollection<Info> infos = new ObservableCollection<Info>();
    public ObservableCollection<Info> Infos
    {
        get
        {
            return infos;
        }
        set
        {
            infos = value;
            RaisePropertyChanged(() => Infos);
        }
    }
}

Any suggestions?

Answer 1

I have no idea what you are talking about. Seriously, you've just dumped a lot of stuff on the screen.

I think you've gotten yourself very confused - good luck trying to work out what on earth you've done.

One basic answer is that you can navigate to an Mvx-based Activity anywhere you want to simply by:

• creating an MvxViewModelRequest - https://github.com/slodge/MvvmCross/blob/v3/Cirrious/Cirrious.MvvmCross/ViewModels/MvxViewModelRequest.cs
• converting the request to an Intent using the IMvxAndroidViewModelRequestTranslator singleton - https://github.com/slodge/MvvmCross/blob/v3/Cirrious/Cirrious.MvvmCross.Droid/Views/IMvxAndroidViewModelRequestTranslator.cs
• starting that Intent

However, I seriously suggest you step out of your current mess and consider a cleaner application flow.