Use APKPure App
Get RhythmView old version APK for Android
Siehe Rhythmen.
RhythmView visualizes the rhythm for you.
View source code at GitHub: https://github.com/SumiMakito/RhythmView
Disclaimer: This demo app (but not the library) needs RECORD_AUDIO and READ_EXTERNAL_STORAGE permissions to work, but it does not require an INTERNET permission.