Manifest Android Interview

Preface

• Testimonial
• Manuel Vivo (Staff Android Engineer at Bumble, Ex Android DevRel at Google)
• Matt McKenna (Senior Android Engineer at Block, Android GDE)
• Alejandra Stamato (Lead Android Engineer at HubSpot, Ex Android DevRel at Google)
• Simona Milanovic (Senior Android Developer Relations Engineer)
• About This Book
• To. Interviewees
• To. Interviewers
• Sponsors
• Stream
• Issue Reports & Discussion

0. Android Interview Questions

Category 0: The Android Framework

• Q) 0. What is Android?
• Q) 1. What is Intent?
• Q) 2. What is the purpose of Pending Intent?
• Q) 3. What are the differences between Serializable and Parcelable
• Q) 4. What is Context and what types of Context exist?
• Q) 5. What is Application class?
• Q) 6. What is the purpose of the AndroidManifest file?
• Q) 7. Describe the Activity lifecycle
• Q) 8. Describe the Fragment lifecycle
• Q) 9. What is Service?
• Q) 10. What is BroadcastReceiver?
• Q) 11. What is the purpose of a ContentProvider, and how does it facilitate secure data sharing between applications?
• Q) 12. How to handle configuration changes?
• Q) 13. How Android handles memory management, and how do you avoid memory leaks?
• Q) 14. What are the main causes of ANR errors, and how can you prevent them from occurring?
• Q) 15. How do you handle deep links?
• Q) 16. What are tasks and back stack?
• Q) 17. What's the purpose of Bundle?
• Q) 18. How do you pass data between Activities or Fragments
• Q) 19. What happens to an Activity during configuration changes?
• Q) 20. What is ActivityManager?
• Q) 21. What are the advantages of using SparseArray
• Q) 22. How do you handle runtime permissions?
• Q) 23. What are the roles of Looper, Handler, and HandlerThread?
• Q) 24. How do you trace exceptions?
• Q) 25. What are build variants and flavors?
• Q) 26. How do you ensure accessibility?
• Q) 27. What is the Android file system?
• Q) 28. What are Android Runtime (ART), Dalvik, and Dex Compiler?
• Q) 29. What are the differences between the APK file and the AAB file?
• Q) 30. What is R8 optimization?
• Q) 31. How do you reduce application sizes?
• Q) 32. What is a process in Android applications, and how does the Android operating system manage it?

Category 1: Android UI - Views

• Q) 33. Describe the View lifecycle
• Q) 34. What's the difference between View and ViewGroup?
• Q) 35. Have you ever used ViewStub and how do you optimize UI performance using it?
• Q) 36. How to implement custom views?
• Q) 37. What is Canvas and how to utilize it?
• Q) 38. What is the invalidation in the View system?
• Q) 39. What is ConstraintLayout?
• Q) 40. When should you use SurfaceView instead of TextureView?
• Q) 41. How does RecyclerView work internally?
• Q) 42. What's the difference between Dp and Sp?
• Q) 43. What is the use of a nine-patch image?
• Q) 44. What is a Drawable, and how is it used in UI development?
• Q) 45. What is Bitmap on Android, and how would you handle large Bitmaps efficiently?
• Q) 46. How do you implement animations?
• Q) 47. What is the Window?
• Q) 48. How do you render a web page?

Category 2: Jetpack Library

• Q) 49. What is the AppCompat library?
• Q) 50. What is the Material Design Components (MDC)?
• Q) 51. What is the advantages of using ViewBinding?
• Q) 52. How DataBinding works?
• Q) 53. What is LiveData?
• Q) 54. What is Jetpack ViewModel?
• Q) 55. What is the Jetpack Navigation Library?
• Q) 56: What are Dagger 2 and Hilt?
• Q) 57. What is the Jetpack Paging library?
• Q) 58. What is Baseline Profile?

Category 3: Business Logic

• Q) 59. How would you manage long-running background tasks?
• Q) 60. How do you serialize Json format to object
• Q) 61. How do you handle network requests to fetch data, and which libraries or techniques do you use for efficiency and reliability?
• Q) 62. Why is a paging system essential for loading large datasets, and how can it be implemented with RecyclerView?
• Q) 63. How do you fetch and render images from the network?
• Q) 64. How do you store and persist data locally?
• Q) 65. How do you handle offline-first features?
• Q) 66. Where do you launch tasks for loading the initial data? LaunchedEffect vs. ViewModel.init()

1. Jetpack Compose Interview Questions

Category 0: Compose Fundamentals

• Q) 0. What is the structure of Jetpack Compose?
• Q) 1. What are the Compose phases?
• Q) 2. Why is Jetpack Compose a declarative UI framework?
• Q) 3. What is recomposition, and when does it occur? Also, how does it related to the app performance?
• Q) 4. How the composable function works internally?
• Q) 5. What is stability in Jetpack Compose, and how does it relate to performance?
• Q) 6. Have you ever had experience optimizing Compose performance by improving stabilities?
• Q) 7. What is composition and how to create it?
• Q) 8. What strategies are available for migrating the XML-based project to Jetpack Compose?
• Q) 9. Why should you always test Compose performance in release mode?
• Q) 10. What Kotlin idioms frequrently used in Jetpack Compose?

Category 1: Compose Runtime

• Q) 11. What is State and which APIs are used to manage it?
• Q) 12. What are the advantages you can take from the state hoisting?
• Q) 13. What are the differences between remember and rememberSaveable?
• Q) 14. How do you safely create a coroutine scope within composable functions?
• Q) 15. How do you handle side effects inside composable functions?
• Q) 16. What is the purpose of rememberUpdatedState, and how does it work?
• Q) 17. What is the purpose of produceState, and how does it work?
• Q) 18. What is snapshotFlow and how does it work?
• Q) 19. What is the purpose of derivedStateOf, and how does it help optimize recomposition?
• Q) 20. What's the lifecycle of composable functions or Composition?
• Q) 21. What is SaveableStateHolder?
• Q) 22. What's the purpose of the snapshot system?
• Q) 23. What are the mutableStateListOf and mutableStateMapOf?
• Q) 24. How can you safely collect Kotlin's Flow in composable functions while preventing memory leaks?
• Q) 25. What's the role of the CompositionLocals?

Category 2: Compose UI

• Q) 26. What's Modifier?
• Q) 27. What is Layout?
• Q) 28. What is Box?
• Q) 29. What are the differences between Arrangement and Alignment?
• Q) 30. What is Painter?
• Q) 31. How do you load images from the network?
• Q) 32. How can you efficiently render hundreds of items as a list in while avoiding UI jank?
• Q) 33. How do you implement pagination with lazy lists?
• Q) 34. What is Canvas?
• Q) 35. Have you ever utilized graphicsLayer Modifier?
• Q) 36. How do you implement visual animations in Jetpack Compose?
• Q) 37. How do you navigate between screens?
• Q) 38. How preview works and how do you handle them?
• Q) 39. How do you write unit tests for Compose UI components or screens?
• Q) 40. What is screenshot testing, and how does it help ensure UI consistency during development?
• Q) 41. How do you ensure accessibility in Jetpack Compose?