release 1.41

• New designed profile
• New icons in action bars (color and size)
• New bottom navigation
• fix memory leak of sections activity
• Logout from profile, not from main screen
• Add again leak canary
• Color for edit text (Android O)
• Add e-mail to vk sign up

release 1.39

• show app name instead of the label of the activity, when user tries to open the app by link
• get video duration from the server
• fix bug, when empty steps were shown incorrectly (+ rotation problem)

release 1.36

• improve time of launching smartlock and LaunchActivity
• remove black screens between splash and launch screens
• introduce quality of video in player
  • database is reworked internally. Urls are saved, when step is loaded
  • do not delete from disk, when file is not found
• fix appindexing of steps: now only selected step is indexed.
• improve steps screen performance (need more improvements)
  • do not allocate memory for some strings constant
• Development
  • remove otto (event bus) partially
  • make comments activity more readable, fix bug, when new comment form was opened inorrectly on some devices

release 1.35

see release notes at wiki

release 1.34

Release notes are in wiki

release 1.33

Look at wiki-release notes

release 1.31

• Add UI espresso test for Login flow
• Add tracking of opened enrolled/unenrolled course
• make profile shareable
• support Roboto fonts
• track step types, when user open and solve it
• Add unit tests for profile
• Add first A/B for "Continue" (hotfixed)
• add tracking of Auth flow

release 1.30

• Add google smartlock for passwords
• add Are you sure dialog, when user wants to delete section or lesson
• fix navigation bug (up button profile)
• fix not centered empty views in profile
• Kotlin: apply android extension plugin to Login, Launch, Registration, TextFeedback views
• add video length before opening in steps
• redesign drawer header, now streak info is showing + changed to black color
• status bar color is changed to black
• put app version, android OS version to User Agent Header
• change placeholder for profile in comments, detailed profile, profile header
• Fix filter bug if all or all except Persistent filter are chosen -> do not apply filter, fix some problems with languages and strange deadlines, refactor filter logic
• add fastlane for continious delivery

release 1.29

• determinate progress of video in Downloads, lessons, sections
• update to Kotlin 1.1
• sign in for anonymous in certificate is fixed
• popular courses instead of featured
• discard courses on swipe to refresh and show only the 1st page
• fix bug with not parsed style attrs in svg

release 1.28

https://github.com/StepicOrg/stepik-android/wiki/Release-notes