Binance Senior Android Engineer interview questions

Tech Round 1 How Hashmap put method works ? How Garbage collector works ? How do you find and fix memory issues in Android ? On what principle Leak Canary works ? How will you set up multi module project ? What are pros and cons of MVVM over MVP ? How do you optimize memory issues in Image downloading and app memory ? Tech Round 2 1. How JVM works ? 2. How is JVM different from Android? 3. What is Android application packaging process ? 4. How GC works in JVM? 5. How GC works in Android? 6. What is Handler, Looper and MessageQueue ? 7. When is Main Thread gets created in an Android app? 8. Can background thread update UI in Android ? 9. How do you detect memory leak in Android? 10. On what principle leak canary works? 11. What is a memory leak? 12. List Activity lifecycles methods in correct order when you press a button on Activity A that launches Activity B? 13. List Fragment lifecycle methods when activity is started and closed ? 14. Explain View lifecycle ? 15. What happens when requestLayout and invalidateView is called on a view? 16. How do you solve touch listener bug on a view in a scroll view which is inside another scroll view? 17. Consider a LinearLayout has two containers and one of the containers has textview inside. What sort of event callbacks triggered when a text view is dragged onto second view? 18. What are good practices when designing view in android? 19. How is live data different from Observable ? 20. How do you trigger retry in okhttp? 21. What are interceptors in okhttp? 22. How okhttp interceptors work ? 23. What is 2 way, 3way and 4 way handshake ? 24. What is SSL pinning ? 25. What is inline function in kotlin ? 26. How many interceptors can we add in retrofit ? 27. What is TLS ? and what version do you use ? 28. What is http ? Tech Round 3 1. Tell me about yourself focusing more on technical skills. 2. How do you track activity lifecycle ? 3. How do you optimize memory in Android ? 4. How leak canary works? 5. How Android clears memory ? 6. How you do MIM attack ? 7. How can you lure user for MIM attack and install unsecure certificate ? 8. What is slow rendering and slow framerate in Android ? 9. When will all the view will be drawn in an activity ? 10. What callback you can hook to know when all views are drawn ? 11. explain how will you implement leak canary ?