B4J Question No MouseEvent on an ImageView

Instead of VolumeEvent_MouseMoved use VolumeEvent_MouseDragged.
MouseMoved is raised when you hover above the node. This doesn't exist in B4A
MouseDragged is raised when you press a button and hover over the node. B4A equivalent TOUCH_MOVE in the Touch event.
MousePressed is raised when you press a button. B4A equivalent TOUCH_DOWN in the Touch event.
MouseReleased is raised when you release a button. B4A equivalent TOUCH_UP in the Touch event.

Thank you Klaus. This works better. At the moment I transcripe my B4A-app to B4J and its the first time for me to use B4J. so I struggle often with finding the best event for something.

new problem:
now I observe, that only starting at the blue parts of the image will start the events. If I start in the transparent part on the left side over the volume 1 the events are not thrown.
I think this is because my image is transparent there. Will filling the whole image rectangle with a nearly transparent white solve this behavior?

And how can I stop, that the parent item gets selected (blue)?

I don't think that the transparency has any influence on the events.

I would suggest you to use the XUI library with B4XViews etc.
If you use a Pane for the image instead of an ImageView you could use the Touch event of the Panel / Pane B4XView.
With this, the code would be the same for both platforms!