One of the simplest apps there are.

(I think it's even simpler than Null Keyboard, which is where I got the idea, too).

metadata/com.notriddle.null_launcer.txt

@@ -0,0 +1,29 @@
+Category:System
+License:GPLv3
+Web Site:http://www.notriddle.com
+Source Code:https://github.com/notriddle/null-launcher
+Issue Tracker:https://github.com/notriddle/null-launcher/issues
+
+Auto Name:Null launcher
+Summary:A launcher that does nothing.
+Description:
+Null launcher is a launcher that does nothing.
+Yes, really.
+It's useful when combined with Wave Launcher, Swapps, and similar.
+
+After installing, press your home button.
+Then, depending on your Android version, either check the "Use by default" box and tap Null launcher, or tap Null launcher then tap "Always."
+
+If you've accidentally switched to Null Launcher with no way to get out, pinch-zoom on the wallpaper and you can change back to your old launcher.
+.
+
+Repo Type:git
+Repo:https://github.com/notriddle/null-launcher.git
+
+Build Version:1.1,11,1.1
+
+Auto Update Mode:None
+Update Check Mode:Tags
+Current Version:1.1
+Current Version Code:11
+