Access to MainActivity or generating a View element (Uno)

How-to Discussions
1

Hey guys,

first of all, Im trying to access the

@Override
public boolean onTouchEvent(MotionEvent event) {
...

for Android. This normally belongs into a MainActivity Java File, which I have no access to through a usual Uno instance.
Ive tried to put it into a uno file and wrap it as a foreign code event method, but it is not touched at all.

Is there a way to append that event to any View element and generate a new View element?

And if its also not possible to wrap that method in any way into an instance or something like that of the running MainActivity?

Is there a way through the uno api to determine if a touch on the View occured and extract the coordinates of it?

Thanks for replies

Benny

2

Hi!

You can make a Native UI Component and use an OnViewTouchListener (which is essentially the same as overriding onTouchEvent)

For example:

extern(Android) public class InputView : LeafView
{
    public InputView() : base(Create())
    {
        InstallOnTouchListener(Handle);
    }

    [Foreign(Language.Java)]
    static Java.Object Create()
    @{
        return new android.view.View(@(Activity.Package).@(Activity.Name).GetRootActivity());
    @}

    bool OnTouch(Java.Object view, Java.Object motionEvent)
    {
        return false;
    }

    [Foreign(Language.Java)]
    void InstallOnTouchListener(Java.Object handle)
    @{
        ((android.view.View)handle).setOnTouchListener(new android.view.View.OnTouchListener() {
            public boolean onTouch(android.view.View v, android.view.MotionEvent event) {
                return @{InputView:Of(_this).OnTouch(Java.Object,Java.Object):Call(v,event)};
            }
        });
    @}
}