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Android Interview Questions and Answers

Android Interview Questions and Answers - Your Cheat Sheet For Android Interview

Prepared and maintained by the Founder of Outcome School: Amit Shekhar

About me

Hi, I am Amit Shekhar, Founder @ Outcome School • IIT 2010-14 • I have taught and mentored many developers, and their efforts landed them high-paying tech jobs, helped many tech companies in solving their unique problems, and created many open-source libraries being used by top companies. I am passionate about sharing knowledge through open-source, blogs, and videos.

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Live session on "Android Developer Interview Preparation for Product-based Companies"

I conducted a live session on "Android Developer Interview Preparation for Product-based Companies"

Interacted with over 500 Android Developers.

Guided, motivated, and inspired them to aim higher and achieve more.

Recording Link: https://www.youtube.com/watch?v=Yby0AA7ZSUE

Document Link: https://docs.google.com/document/d/14UdD7Gd1j3no583ALx2t2Ggt3G_CECYhenLE-m-bkzA/edit?usp=sharing

Contents - Android Interview Questions

• Android Interview Questions and Answers Playlist
• Kotlin Coroutines
• Kotlin Flow API
• Kotlin
• Android
• Android Libraries
• Android Architecture
• Design Pattern
• Android System Design and check Android System Design Interviews
• Android Unit Testing
• Android Tools And Technologies
• Jetpack Compose
• Java
• Other Topics
• Data Structures and Algorithms

* For Android Machine Coding Round Interview, Check: Android Machine Coding Round Interview

I teach at Outcome School

• AI and Machine Learning
• Android

Join Outcome School and get a high-paying tech job: Outcome School

Fast-Track Android Interview Preparation: Join Outcome School Android Program

Android Interview Questions and Answers Playlist

Watch this video on "Android Developer Interview Preparation for Product-Based Companies": Android Developer Interview Preparation for Product-Based Companies

• Question: Android Push Notification Flow using FCM
  • Answer: Android Push Notification Flow using FCM
• Question: What is an inline function in Kotlin?
  • Answer: What is an inline function in Kotlin?
• Question: What is the advantage of using const in Kotlin?
  • Answer: What is the advantage of using const in Kotlin?
• Question: What is a reified keyword in Kotlin?
  • Answer: What is a reified keyword in Kotlin?
• Question: Suspending vs Blocking in Kotlin Coroutines
  • Answer: Suspending vs Blocking in Kotlin Coroutines
• Question: Retrofit vs OkHttp
  • Answer: Retrofit vs OkHttp
• Question: Launch vs Async in Kotlin Coroutines
  • Answer: Launch vs Async in Kotlin Coroutines
• Question: internal visibility modifier in Kotlin
  • Answer: internal visibility modifier in Kotlin
• Question: open keyword in Kotlin
  • Answer: open keyword in Kotlin
• Question: lateinit vs lazy in Kotlin
  • Answer: lateinit vs lazy in Kotlin
• Question: What is Multidex in Android?
  • Answer: What is Multidex in Android?
• Question: How does the Android Push Notification system work?
  • Answer: How does the Android Push Notification system work?
• Question: How does the Kotlin Multiplatform work?
  • Answer: How does the Kotlin Multiplatform work?
• Question: What is a ViewModel and how is it useful?
  • Answer: What is a ViewModel and how is it useful?
• Question: Is it possible to force the Garbage Collection in Android?
  • Answer: Is it possible to force Garbage Collection in Android?
• Question: What is a JvmStatic Annotation in Kotlin?
  • Answer: What is a JvmStatic Annotation in Kotlin?
• Question: init block in Kotlin
  • Answer: init block in Kotlin
• Question: JvmField Annotation in Kotlin
  • Answer: JvmField Annotation in Kotlin
• Question: singleTask launchMode in Android
  • Answer: singleTask launchMode in Android
• Question: Difference between == and === in Kotlin
  • Answer: Difference between == and === in Kotlin
• Question: JvmOverloads Annotation in Kotlin
  • Answer: JvmOverloads Annotation in Kotlin
• Question: Why is it recommended to use only the default constructor to create a Fragment?
  • Answer: Why is it recommended to use only the default constructor to create a Fragment?
• Question: Why do we need to call setContentView() in onCreate() of Activity class?
  • Answer: Why do we need to call setContentView() in onCreate() of Activity class?
• Question: When only onDestroy is called for an activity without onPause() and onStop()?
  • Answer: When only onDestroy is called for an activity without onPause() and onStop()?

Fast-Track Android Interview Preparation: Join Outcome School Android Program

Kotlin Coroutines

Topics you should know in Kotlin Coroutines for Android Interview:

• coroutines
• suspend
• launch, async-await, withContext
• dispatchers
• scope, context, job
• lifecycleScope, viewModelScope, GlobalScope
• suspendCoroutine, suspendCancellableCoroutine
• coroutineScope, supervisorScope
• runBlocking
• Exception Handling

Learn the above-mentioned from the following links:

• Master Kotlin Coroutines
• Suspending vs Blocking in Kotlin Coroutines
• Launch vs Async in Kotlin Coroutines
• Dispatchers in Kotlin Coroutines
• coroutineScope vs supervisorScope
• suspend function in Kotlin Coroutines
• Kotlin withContext vs Async-await
• CoroutineContext in Kotlin
• Callback to Coroutines in Kotlin
• Retrofit with Kotlin Coroutines
• Parallel Multiple Network Calls Using Kotlin Coroutines
• Room Database with Kotlin Coroutines
• Unit Testing ViewModel with Kotlin Coroutines and LiveData

Kotlin Flow API

Topics you should know in Kotlin Flow API for Android Interview:

• Flow Builder, Operator, Collector
• flowOn, dispatchers
• Operators such as filter, map, zip, flatMapConcat, retry, debounce, distinctUntilChanged, flatMapLatest
• Terminal operators
• Cold Flow vs Hot Flow
• StateFlow, SharedFlow, callbackFlow, channelFlow

Learn the above-mentioned from the following links:

• Mastering Flow API in Kotlin
• Creating Flow Using Flow Builder in Kotlin
• Terminal Operators in Kotlin Flow
• Cold Flow vs Hot Flow
• StateFlow and SharedFlow
• Long-running tasks in parallel with Kotlin Flow
• Retry Operator in Kotlin Flow
• Retrofit with Kotlin Flow
• Room Database with Kotlin Flow
• Kotlin Flow Zip Operator for Parallel Multiple Network Calls
• Instant Search Using Kotlin Flow Operators
• callbackFlow - Callback to Flow API in Kotlin
• Exception Handling in Kotlin Flow
• Unit Testing ViewModel with Kotlin Flow and StateFlow

Kotlin

Android Interview Questions and Answers:

• 15 Kotlin Interview Questions and Answers: Check the PDF

• What is the advantage of using const in Kotlin? - Video and Blog

• When to use lateinit keyword used in Kotlin? - Learn from here

• What is inline function in Kotlin? - Video and Blog

• What are companion objects in Kotlin? - Learn from here

• Extension functions - Learn from here

• What is a data class in Kotlin? - Learn from here

• Remove duplicates from an array in Kotlin - Learn from here

• What is a JvmStatic Annotation in Kotlin? - Video and Blog

• What is a JvmField Annotation in Kotlin? - Video and Blog

• What is a JvmOverloads Annotation in Kotlin? - Video and Blog

• noinline in Kotlin - Learn from here

• crossinline in Kotlin - Learn from here

• scope functions in Kotlin - Learn from here

• What is a reified keyword in Kotlin? - Learn from here

• lateinit vs lazy in Kotlin - Learn from here

• What is an init block in Kotlin? - Video and Blog

• Difference between == and === in Kotlin - Video and Blog

• Advantage of using const in Kotlin - Learn from here

• What are higher-order functions in Kotlin? - Learn from here: Higher-Order Functions and Lambdas in Kotlin

• **Write a function(Higher-Order Fun