MVVMCross Bindings in Android

Question

I\'m developing a cross-platform App starting it in android. I\'ve found your MVVMCross project and I\'m trying to get into it. Right now I\'m totally new to it and don\'t k

Answer 1

To get these attributes to bind you need to include the namespace - which it looks like you've done.

You also need to include the MvxBindingAttributes.xml file into your UI project - https://github.com/slodge/MvvmCross/blob/master/Cirrious/Cirrious.MvvmCross.Binding/ResourcesToCopy/MvxBindingAttributes.xml - and you must set the build action of this file to "AndroidResource"

For an example, see any of the Android sample projects - https://github.com/slodge/MvvmCross

---

For the second part of your question about adding bindings, the binding framework should automatically one-way bind (from ViewModel to View) to existing public Properties on any Monodroid View/widget.

If the public Property isn't of the correct type (e.g. it's some Android enumeration instead of a View), then you can use an IMvxValueConverter to do the conversion.

If you want to do 2-way binding, or there isn't a public Property for what you want to bind to, then you fairly easily do a custom binding. For an example of this, see the custom IsFavorite 2 way binding in the conference sample

This code adds a new bindable pseudo-property "IsFavorite" to every Android Button.

... this is initialised in Setup.cs using code like:

    protected override void FillTargetFactories(MvvmCross.Binding.Interfaces.Bindings.Target.Construction.IMvxTargetBindingFactoryRegistry registry)
    {
        base.FillTargetFactories(registry);

        registry.RegisterFactory(
                    new MvxCustomBindingFactory<Button>(
                       "IsFavorite", 
                       (button) => new FavoritesButtonBinding(button)));
    }

... and the binding code is:

public class FavoritesButtonBinding
    : MvxBaseAndroidTargetBinding
{
    private readonly Button _button;
    private bool _currentValue;

    public FavoritesButtonBinding(Button button)
    {
        _button = button;
        _button.Click += ButtonOnClick;
    }

    private void ButtonOnClick(object sender, EventArgs eventArgs)
    {
        _currentValue = !_currentValue;
        SetButtonBackground();
        FireValueChanged(_currentValue);
    }

    public override void SetValue(object value)
    {
        var boolValue = (bool)value;
        _currentValue = boolValue;
        SetButtonBackground();
    }

    private void SetButtonBackground()
    {
        if (_currentValue)
        {
            _button.SetBackgroundResource(Resource.Drawable.star_gold_selector);
        }
        else
        {
            _button.SetBackgroundResource(Resource.Drawable.star_grey_selector);
        }
    }

    protected override void Dispose(bool isDisposing)
    {
        if (isDisposing)
        {
            _button.Click -= ButtonOnClick;
        }
        base.Dispose(isDisposing);
    }

    public override Type TargetType
    {
        get { return typeof(bool); }
    }

    public override MvxBindingMode DefaultMode
    {
        get { return MvxBindingMode.TwoWay; }
    }
}