I published a new pre-release of my Android Morse trainer Dahdidahdit. You can now use an external mouse (or an adapter that pretends to be one) as a Morse key. The new version should also install on Android 15. I'd be very happy if somebody with an actual Android 15 phone could test it and let me know about the results. (It runs on an Android 15 emulator but the emulator is super slow, so testing there is nearly impossible.)
https://github.com/matthiasjordan/dahdidahdit/releases/tag/rc-1.15.0-1
