Waydroid
Xtmapper works by reading input events directly from event nodes created by the Linux kernel input subsystem, aiming for lowest latency.
https://docs.kernel.org/input/input.html
This apporach doesn’t work for waydroid since host event nodes are not available in the waydroid container.
Due to the interest of the community we worked on two solutions for waydroid.
First a minimal wayland client that overlays the waydroid window and later a modified version of the cage kiosk wayland compositor to forward input events to XtMapper excluding waydroid.
Both are maintained but cage-xtmapper should be the most convenient solution.
However it has a minimal overhead of running another wayland compositor.
Check the README.md in the relevant repository for instructions.