Android Question CustomListView vertical scroll overrides GestureDetector fling capture

[Jimdriver2]

On my app I've got a full screen CustomListView I'm using vertically and adding panels to, much like the cards in the tutorial example.

What I need to have however is the ability to swipe left and right on that CLV and cause it to load in a different set of panels.

I've added a GestureDetector object and whilst that works fine capturing the 'fling' event on a temporary static panel I added to the top of the screen. So I know I'm using that correctly.

However I can't get the GestureDetector to work on the CLV or any of the Views I add to it. I've tried doing what the GestureDetector example does and adding the whole Activity as a listener. That didn't seem to do anything. CLV's can't be added as listeners. I tried adding the GestureDetector to the different Views I add to my CLV. The panels I'm adding have a few different labels and an ImageView on them. I added the GestureDetector to all of them but it's not really working. Ever so often some fling events get captured but mostly they don't. I've two theories why:

1. the Views are fairly small and therefore there isn't enough space 'in them' for a fling to be correctly interpreted

2. the CLV seems to read almost any motion happening as a vertical scroll and it captures that touch event. (Hence my title of this thread)

Ideally I need something that for the whole activity, no matter what View is being touched, a swipe or fling event will be captured by my GestureDetector.

Is there any way to make the GestureDetector the top priority for touch events?

Thanks.

 

[Erel]

Is there any way to make the GestureDetector the top priority for touch events?

It will then break CLV scrolling.

Check this class code: https://www.b4x.com/android/forum/t...pe-actions-and-pull-to-refresh.98252/#content
And this one: [B4X] B4XDrawer - sliding drawer

It is a bit complicated however it is possible to detect gestures without breaking the contained views behavior.

 

[Jimdriver2]

Ok thanks Erel. I gave them a quick look and it seems like it would need to be a case of doing something with a TouchPanelCreator as you've done in the Sliding Drawer class. I think I'd have to sort of replicate what you've done in that class, but rather than have it show a menu it would need to provide an event where code can do the actions I want.

It's possibly a bit more fiddly than I initially anticipated so I might hold off for now and see if I can figure out some other way of implementing the similarly functionality. I'm surprised capturing touch behaviour is still as tricky in Android and requires such a kind of low level shaping of the structure of your activity.