What architecture do you use? Explain it. Do we have references of activity in viewmodel? What is livedata? Explain architecture for app of with list and detail view including network API. What is clean architecture? Example of MVP clean architecture. Which classes(UI, repository, network, etc) should belongs to which MVP architecture component? Test driven development. Which unittest you did? What are the test doubles? What are the stub, spy? Difference between unit test and integration test? What do you prefer to use Composition or Inheritance? Software design patterns (like singleton, observer, builder and adapter.) Difference between hashmap and hashtable. Internal structure of hashmap. SOLID principal. Use dagger. Which approach to take for satisfying depency for applicationContext and context? Fail-safe and fail-fast. Which one are fail-safe? How to pass message between thread? How handler works? What is looper? How to make singleton threadsafe? In a class there are 2 methods, 1 is static and another is instance, both synchronised, can 2 thread access both of those methods at same time? What is functional interface, marker interface, tag interface? How to make collapsing Toolbar? How to use SinglyLinkedList as Stake? Scenario to explain use of single task launchmode. How to pass data from 1 fragment to another which are in same activity? What is intent filter? What is Certificate pinning? What's intent service? What's sticky broadcast? Explain Comparable and Comparator. How to create a method which accepts any List like List<A> or List<B> as argument? Explain try with resources. In which order activities lifecycle methods will be called when starting Activity A from Activity B?