How to properly organize the interaction between Service and Activity?

Question

Android

It is not entirely clear how and with what help to get data from the service (the service works with a local database)

Answer 1

I agree with IceJOKER, but for going to the database, I would recommend using something else
, for example, CursorLoader, it inherits from AsyncTaskLoader and, in conjunction with ContentProvider, brings very nice magic and excellent performance out of the box into our lives))
or if you don’t want to use the disgusting ContentProvider api, take a look towards rxjava

Answer 2

https://developer.android.com/guide/components/ser...
you can also use broadcastreceiver
Listen to Oleg Gamega , good advice