ConstraintLayoutOverlap

TL;DR

If you are using the (awesome!) ConstrainLayout* on Android, there is no out-of-the-box way to hide a view if the screen is too small to contain everything. If you have this requirement, keep on reading!

*= version 1.1.0-beta1 at the time of writing

Requirements

Consider you are required to:

have a view with a specific width to height ratio
have such view "full bleed"
hide such view if there is no space left on small screen

Case 1

If you are using a framework layout (eg. ConstraintLayout, FrameLayout, etc.) and you don't need to change it's size dynamically you can just register an OnPreDrawListener and hide the view

main_container.viewTreeObserver.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener {
            override fun onPreDraw(): Boolean {
                main_container.viewTreeObserver.removeOnPreDrawListener(this)

                if (top_view.bottom > bottom_view.top) {
                    bottom_view.visibility = GONE
                }
                return false //This is important! Otherwise the first frame with the view flashes on screen.
            }

The small drawback is: you loose a frame, but fair enough!

Case 2

If instead you want to animate the container, you can override onLayout and make some calculation. In this git repo you can find an example called NotOverlappingConstraintLayout and in this case the usage is pretty simple:

 main_container.hide(bottom_view).whenOverlapping(top_view)

On the plus size: not a single frame is lost! yay!

In the following demo: the 'snake' image cannot be resized, but can be hidden

Case 3

..or to avoid coding just have different layouts with screen size modifiers, as suggested by @camaelon in https://twitter.com/petz/status/871320692016414720

Note:

This is a proof of concept, but if there is any interest just let me know I can extract it into a proper library
For this demo I'm using a ConstraintLayout. The latest release is 1.1.0-beta1. If in the future this use case will be supported I'll deprecate this entire project!
Are you wondering: who wrote such strange UI requirements, where a view cannot be resized but can be hidden? Well, just one word: advert!
This kind of approach has been suggested during a discussion at Google I/O 2017 with @johnhoford & @camaelon

Thanks to pixabay.com for the images used in the sample code.

fpezzato / ConstraintLayoutOverlap