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I was asked


  • Handler
  • serializable, parcelable
  • Service, IntentService. What is inside?
  • Fragment, FragmentTransaction, commit. How does the commit method work? Is commit synchronized?
  • SynchronizationInter-process communication:  mutexes, semaphores, events, etc.
  • Collections in java
  • Memory leaks due to rotation with AsyncTask
  • RxJava
  • What is UI-thread, how does it work?
  • Loader
  • Which lifecycle methods of activity will be guaranteed invoked if OS destroys the one?
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Java Android faq

Collections in java. don’t forget

Complexity pdf

Often Ignored Stuff — Android Data Structures (


  • JPA, Hibernate pdf
  • java opensource on github pdf
  • collections (jdk, guava, apache etc) pdf
  • java stream api pdf dzone
  • studing java pdf
  • links pdf
  • inputstream into string pdf
  • map, substring in string pdf
  • json pdf