Question

this is with regard to the following question on stackoverflow. I am trying to have a touch command for a button as described here but nothing happens. mvvmcross touch command binding in android

<Button
xmlns:local="http://schemas.android.com/apk/res/Test.UI.Droid"
android:text="Office"
android:layout_column="0"
android:id="@+id/imageButton1" 
local:MvxBind="{'Touch':{'Path':'ItemClickCommand'}}"/>  


public IMvxCommand ItemClickCommand
{
get
{
return new MvxRelayCommand(() => this.RequestNavigate<Tests.OfficeViewModel>(true));
}
}  

What am I doing wrong in the above code, why does it not fire.

Answer 1

There’s no binding in place for a Touch at present.

public event EventHandler<View.TouchEventArgs> Touch

If you wanted to add one, then search on StackOverflow for how to setup a new binding – e.g. the answer in mvvmcross touch command binding in android gives quite a full example.

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However… for most button presses, you can probably just use:

public event EventHandler Click

Because it’s an EventHandler rather than an EventHandler<TCustom> then this binds automagically.

i.e.:

<Button
xmlns:local="http://schemas.android.com/apk/res/Test.UI.Droid"
android:text="Office"
android:layout_column="0"
android:id="@+id/imageButton1" 
local:MvxBind="{'Click':{'Path':'ItemClickCommand'}}"/>  

should work – and it’s probably what you are looking for – you want to respond to the Click of a button, not just a Touch?

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To debug problems with binding it’s worth looking at the MvxBindingTrace output – normally it will tell you when it can’t bind to things – and if it doesn’t, then please log bugs on github issues 🙂