Question

I have HorizontalOnScreenControl class which extends BaseOnScreenControl, it is the same as DigitalOnScreenControl, but it works only horizontal. It’s working fine. But one of this parents is Scene, and I think that why we need to do scene.setChildScene(mDigitalOnScreenControl).

Problem: when I want, for example, show popup and when I use .setChildScene() one more time, my control disappears. But if I try to add directly to main scene: scene.AttachChild(mDigitalOnScreenControl) than I can’t touch it, it’s is not working, but visible.

Answer 1

You should use Camera.setHUD instead of Scene.setChildScene.

Quoting from the HUD.java file:

While you can add a HUD to Scene, you should not do so. HUDs are meant to be added to Cameras via Camera.setHUD(HUD).

If you need to add 2 or more HUDs, you can chain them this way (I have 2 HUDs in one of my games, and that’s how I do it. Works fine)

hud2.setChildScene(hud3);
hud1.setChildScene(hud2);
camera.setHUD(hud1);

Now you can call Scene.setChildScene and your control won’t disappear.

General knowledge: When AndEngine receives a touch event from the Android framework, the event passes through a list entities. If any of them consumes the event, it stops. The priorities are:

1. Camera’s HUD (If exists)
2. Child scene (If exists)
3. Touch areas in the scene (If there are any)
4. onSceneTouchEvent method.

Now, in your problem, when you attach the control to the scene as a regular entity, it doesn’t receive the priority it should (Controls – HUDs have a first priority). So the event was probably consumed before it even reached the control.