App ideas for a beginner Android developer?

Question

Android

Any ideas, even the most stupid ones will do (to be honest, my first and only application - translates Cyrillic into KNPNJIJINL|Y)

Answer 1

For example, analyzing the list of calls and SMS and building charts on the screen, where it is shown to whom I call and write most often.
Further, you can complicate - save these charts as a picture and post on the wall / tweet / instagram / send to a friend by email.
Saving all these statistics in a local database.
Backup statistics data to the cloud - for example, export data to json and put it somewhere on Yandex. Disk. Accordingly, the possibility of restoring these statistics.
A background task that in the background watches updates to the list of calls and SMS, recalculates statistics and adds them to the database.
Show all sorts of notifications, for example, after a successful update of statistics in the background, write about it.
This will already be enough to learn a decent piece of the Android API =)