How to play a sound at certain times even after locking the application

[Still-learning]

Pls try with background task extension.

[Discontinued] Background Tasks [4.1]

GitHub Tasks 4.0/4.1 ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎‏‏‎ ‎— Background works simplified [logo] In this version, the complete source code is rewritten to make it better with significantly large improvements. This version lacks some features which were in the previous versions until it gets stable enough. There are a few highlights, which are mentioned below. Highlights Ability to access app’s procedures. Improved scheduling of tasks and components …