c# - Issue with binding to GridLayout to Android

Question

I create game using technology Mono. While writing, I have a problem. I need create a grid (4 to 5) with pictures. I thought to apply here GridLayout or GridView. But I do not know how to dynamically create images in GridLayout, which are updated with ViewModel (properties List ). During the game will change object properties SquareModel in List, namely the path to the image. If you click on the image, it will change.

A similar game I did ??in Windows Phone. There did not have problems.

Answer 1

Now the example of BindableGridView is on https://github.com/slodge/MvvmCross/issues/37

Here is the solution we used to bind images on Buttons when the name of the file comes from a viewmodel:

1) Create a binding

public class MvxButtonIconBinding: MvxBaseAndroidTargetBinding
{
    private readonly View _view;

    public MvxButtonIconBinding(View view)
    {
        _view = view;
    }

    public override void SetValue(object value)
    {
        string path = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
        path = Path.Combine(path, "pictures");
        path = Path.Combine(path, (string)value);
        if (File.Exists(path))
        {
            var dr = Drawable.CreateFromPath(path);
            Button b = _view as Button;
            var drawables = b.GetCompoundDrawables();
            foreach (var d in drawables)
                if (d!=null)
                    d.Dispose(); // To avoid "out of memory" messages
            b.SetCompoundDrawablesWithIntrinsicBounds(null, dr, null, null);
        }
        else
        {
            Console.WriteLine("File {0} does not exists", path);
        } 
    }

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

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

    protected override void Dispose(bool isDisposing)
    {
        if (isDisposing)
        {
        }
        base.Dispose(isDisposing);
    }
}

2) Setup the binding :

 registry.RegisterFactory(new MvxCustomBindingFactory<View>("ButtonIcon", view => new MvxButtonIconBinding(view)));

3) Use it in your gridview/listview:

    <ShopBazarAndroid.MvvmCross.MvxBindableGridView
        android:layout_width="0dp"
        android:layout_weight="8"
        android:layout_height="fill_parent"
        android:id="@+id/ArticleLayout"
        android:columnWidth="170dp"
        android:numColumns="auto_fit"
        android:verticalSpacing="5dp"
        android:horizontalSpacing="5dp"
        android:stretchMode="columnWidth"
        android:gravity="center"
        local:MvxItemTemplate="@layout/article_buttonlayout"
        local:MvxBind="{&apos;ItemsSource&apos;:{&apos;Path&apos;:&apos;VisualArticles&apos;}}" />

"article_buttonlayout" :

 <Button
    android:id="@+id/ButtonArticle"
    android:layout_width="fill_parent"
    android:layout_height="160dp"
    android:gravity="bottom|center"
    android:paddingBottom="5dp"
    android:paddingTop="5dp"
    local:MvxBind="{'Click':{'Path':'Command1'},'ButtonIcon':{'Path':'Item.PictureFileName'}}"
    android:textSize="14dip"
    android:textColor="@drawable/ToggleButtonSelector" />

Where "Item" is my object, and "PictureFileName", the filename on the local filesystem.
I'm new on C#, be indulgent if you find errors :)