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.

You can connect with me on:

• X/Twitter
• YouTube
• LinkedIn
• GitHub

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 Function) that returns a function. - Check solution here

• What are Lambdas in Kotlin - Learn from here: Higher-Order Functions and Lambdas in Kotlin

• AssociateBy - List to Map in Kotlin - Learn from here

• Open keyword in Kotlin - Learn from here

• Companion object in Kotlin - Learn from here

• internal visibility modifier in Kotlin - Learn from here

• partition - filtering function in Kotlin - Learn from here

• Infix notation in Kotlin - Learn from here

• How does the Kotlin Multiplatform work? - Learn from here

• Suspending vs Blocking in Kotlin Coroutines - Learn from here

• What is runBlocking in Coroutines? - Learn from here

• What is the meaning of structured concurrency in Kotlin Coroutines? - Learn from here

• String vs StringBuffer vs StringBuilder - Learn from here

• What is the difference between val and var? - Learn from here

• How to check if a lateinit variable has been initialized? - Learn from here

• How to do lazy initialization of variables in Kotlin? - Learn from here

• What are the visibility modifiers in Kotlin? - Learn from here

• What is the equivalent of Java static methods in Kotlin? - Learn from here

• How to create a Singleton class in Kotlin? - Learn from here

• What is the difference between open and public in Kotlin? - Learn from here

• apply scope function and its use cases - Learn from here

• let scope function and its use cases - Learn from here

• Explain the use-case of let, run, with, also, apply in Kotlin. - Learn from here and here

• How to choose between apply and with? - Learn from here and here

• Difference between List and Array types in Kotlin - Learn from here

• What are Labels in Kotlin? - Learn from here

• What are Coroutines in Kotlin? - Learn from here

• What is Coroutine Scope? - Learn from here

• Scopes in Kotlin Coroutines Used in Android - Learn from here

• What is Coroutine Context? - Learn from here

• Launch vs Async in Kotlin Coroutines - Learn from here

• Thread.sleep() vs delay() in Kotlin - Learn from here

• Explain inline classes in Kotlin - Learn from here

• Sealed Classes in Kotlin - Learn from here

• Sealed classes common use-cases in Android - Learn from here

• Tell about the Collections in Kotlin - Learn from here

• What does ?: do in Kotlin? (Elvis Operator) - Learn from here

• timeouts in Kotlin Coroutines - Learn from here

• How do you combine multiple coroutine results? - Learn from here

• What is a Job in Coroutines? - Learn from here

• Coroutines job.cancel() vs scope.cancel() - Learn from here

• What happens if an exception is thrown inside an async coroutine, but await() is never called? - Learn from here

• How to Implement Debounce Using Coroutines? - Learn from here

• Kotlin code snippet demonstrating how to run two coroutines in series and parallel - Learn from here

• yield in Kotlin Coroutines - Learn from here

• Delegates in Kotlin - Learn from here

• stateIn vs shareIn in Kotlin Flow - Learn from here

• flatMapConcat, flatMapMerge, and flatMapLatest in Kotlin Flow - Learn from here

• collect vs collectLatest in Kotlin Flow - Learn from here

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

Android

Android Interview Questions and Answers:

Base

• Why does an Android App lag? - Learn from here

• What is Context? How is it used? - Context In Android Application

• How Zygote makes Android apps start faster? - How Zygote makes Android apps start faster?

• Tell all the Android application components. - Learn from here

• What is the project structure of an Android Application? - Learn from here

• What is AndroidManifest.xml? - Learn from here

• What is the Application class? -Learn from here

Activity and Fragment

• Why is it recommended to use only the default constructor to create a Fragment? - Learn from video and blog

• What is Activity and its lifecycle? - Learn from here

• What is the difference between onCreate() and onStart() - Learn from here

• When only onDestroy is called for an activity without onPause() and onStop()? - Learn from here

• Why do we need to call setContentView() in onCreate() of Activity class? - Learn from here

• What is onSaveInstanceState() and onRestoreInstanceState() in activity? - Learn from here

• What is Fragment and its lifecycle? - Learn from here

• What is Bundle in Android? - Learn from here

• What are "launchMode"? - Learn from here and singleTask launchMode in Android

• What is the difference between a Fragment and an Activity? Explain the relationship between the two. - Learn from here

• When should you use a Fragment rather than an Activity?

  • When you have some UI components to be used across various activities
  • When multiple views can be displayed side by side just like ViewPager

• What is the difference between FragmentPagerAdapter vs FragmentStatePagerAdapter?

  • FragmentPagerAdapter: Each fragment visited by the user will be stored in the memory but the view will be destroyed. When the page is revisited, then the view will be created not the instance of the fragment.
  • FragmentStatePagerAdapter: Here, the fragment instance will be destroyed when it is not visible to the user, except the saved state of the fragment.

• What is the difference between adding/replacing fragment in backstack? - Learn from here

• How would you communicate between two Fragments?

• What is retained Fragment? - Learn from here

• What is the purpose of addToBackStack() while commiting fragment transaction?

  • By calling addToBackStack(), the replace transaction is saved to the back stack so the user can reverse the transaction and bring back the previous fragment by pressing the Back button. For more Learn from here

Views and ViewGroups

• Optimizing layouts in Android - Learn from here

• What is View in Android?

• Difference between View.GONE and View.INVISIBLE? - Learn from here

• Can you a create custom view? How?

• What are ViewGroups and how they are different from the Views?

  • View: View objects are the basic building blocks of User Interface(UI) elements in Android. View is a simple rectangle box which responds to the user’s actions. Examples are EditText, Button, CheckBox etc. View refers to the android.view.View class, which is the base class of all UI classes.
  • ViewGroup: ViewGroup is the invisible container. It holds View and ViewGroup. For example, LinearLayout is the ViewGroup that contains Button(View), and other Layouts also. ViewGroup is the base class for Layouts.

• What is a Canvas? - Learn from here

• What is a SurfaceView? - Learn from here

• Relative Layout vs Linear Layout.

• Tell about Constraint Layout optimization - Learn from here

• Do you know what is the view tree? How can you optimize its depth? - Learn from here

Displaying Lists of Content

• What is the difference between ListView and RecyclerView? - Learn from here

• How does the RecyclerView work? - Learn from here

• RecyclerView Optimization - Scrolling Performance Improvement - Learn from here

• Optimizing Nested RecyclerView - Learn from here

• How does RecyclerView improve performance over ListView?

• What are the components of a RecyclerView?

• Explain the role of RecyclerView.Adapter and RecyclerView.ViewHolder - Learn from here

• What is a LayoutManager in RecyclerView?

• How do you handle multiple view types in a single RecyclerView?

• What is DiffUtil and how does it improve RecyclerView performance? - Learn from here

• What is the purpose of RecyclerView.setHasFixedSize(true)? - Learn from here

• How do you update a specific item in RecyclerView?

• What is SnapHelper? - Learn from here: SnapHelper

Dialogs and Toasts

• What is Dialog in Android? - Learn from here

• What is Toast in Android? - Learn from here

• What the difference between Dialog and Dialog Fragment? - Learn from here

Intents and Broadcasting

• What is Intent? - Learn from here

• What is an Implicit Intent? - Learn from here

• What is an Explicit Intent? - Learn from here

• What is a BroadcastReceiver? - Learn from here

• Describe how broadcasts and intents work to be able to pass messages around your app? - Learn from here

• What is a PendingIntent?

  • If you want someone to perform any Intent operation at future point of time on behalf of you, then we will use Pending Intent.

• What are the different types of Broadcasts? - Learn from here

Services

• Explain Android Service Lifecycle - Learn from here

• What is Service? - Learn from here

• On which thread does a Service run in Android? - Learn from here

• Service vs IntentService - Learn from here

• What is a Foreground Service? - Learn from here

• What is a JobScheduler? - Learn from here

• How Does WorkManager Guarantee Task Execution? - Learn from here

Inter-process Communication

• How can two distinct Android apps interact? - Learn from here

• Is it possible to run an Android app in multiple processes? How? - Learn from here

• What is AIDL? Enumerate the steps in creating a bounded service through AIDL. - Learn from here

• What can you use for background processing in Android? - Learn from here

• What is a ContentProvider and what is it typically used for? - Learn from here

Long-running Operations

• How to run parallel tasks and get a callback when all are complete? - Long-running tasks in parallel with Kotlin Flow

• What is ANR? How can the ANR be prevented? - Learn from here

• ThreadPool Advantages - Learn from here

• Daemon Threads vs. User Threads - Learn from here

• Explain Looper, Handler, and HandlerThread.

• Garbage Collection - Learn from here

• Memory Leak vs Out of Memory(OOM) Error - Learn from here

• Can you explain the difference between a Runnable and a Thread in Android? - Learn from here

Working With Multimedia Content

• How do you handle bitmaps in Android as it takes too much memory? - Learn from here and here

• Tell about the Bitmap pool. - Learn from here

Data Saving

• Jetpack DataStore Preferences - Learn from here

• Persisting Data in an Android App - Learn from here

• What is ORM? How does it work?

• How would you preserve the Activity state during a screen rotation? - Learn from here

• What are different ways to store data in your Android app? - Learn from here

• Explain Scoped Storage in Android.

• How to encrypt data in Android?

• What is commit() and apply() in SharedPreferences?

  • commit() returns a boolean value of success or failure immediately by writing data synchronously.
  • apply() is asynchronous and it won't return any boolean response. If you have an apply() outstanding and you are performing commit(), then the commit() will be blocked until the apply() is not completed.

Look and Feel

• What is a Spannable?

• What is a SpannableString?

  • A SpannableString has immutable text, but its span information is mutable. Use a SpannableString when your text doesn't need to be changed but the styling does. Spans are ranges over the text that include styling information like color, highlighting, italics, links, etc

• What are the best practices for using text in Android?

• How to implement Dark mode in any application?

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

Memory Optimizations

• Improve Android App Performance - Learn from here

• What is the onTrimMemory() method? - Learn from here

• How to identify and fix OutOfMemory issues?

• How do you find memory leaks in Android applications?

Battery Life Optimizations

• How Android Implements Adaptive Battery Using ML? - How Android Implements Adaptive Battery Using ML?

• How to reduce battery usage in an Android application?

• What is Doze? What about App Standby? - Learn from here

• What is overdraw? - Learn from here

Supporting Different Screen Sizes

• How do you support different types of resolutions? - Learn from here

Permissions

• What are the different protection levels in permission?

Native Programming

• What is the NDK and why is it useful? - Learn from here: Android NDK and RenderScript

• What is renderscript? - Learn from here: Android NDK and RenderScript

Android System Internal

• What is Android Runtime? - Android Runtime

• Dalvik, ART, JIT, and AOT in Android - Dalvik, ART, JIT, and AOT

• What are the differences between Dalvik and ART? - Difference between Dalvik and ART

• Baseline Profiles - Learn from here

• What is DEX? - Learn from here

• What is Multidex in Android? - Learn from here

• Can you manually call the Garbage collector? - Is it possible to force Garbage Collection in Android?

• Android App Starts: Hot, Warm & Cold - Android App Starts: Hot, Warm & Cold

Android Jetpack

• What is Android Jetpack and why to use this?

• What is a ViewModel and how is it useful? Learn: What is a ViewModel and how is it useful?

• SharedViewModel in Android Learn: SharedViewModel in Android

• What are Android Architecture Components?

• StateFlow vs LiveData in Android Development Learn: StateFlow vs LiveData

• What is LiveData in Android? What is LiveData in Android?

• How is LiveData different from ObservableField?

• What is the difference between setValue and postValue in LiveData? Learn: setValue() vs postValue() in LiveData

• How do you share ViewModel between Fragments in Android? Learn: SharedViewModel in Android

• Explain WorkManager and its use cases.

• Minimum repeat interval allowed when scheduling a PeriodicWorkRequest using WorkManager - Learn from here

• How Does WorkManager Guarantee Task Execution? - Learn from here

• How does ViewModel work internally?

Others

• What is the difference between Serializable and Parcelable? Which is the best approach in Android? - Learn from here

• Why Bundle class is used for data passing and why cannot we use simple Map data structure? - Learn from here

• How do you troubleshoot a crashing application? - Learn from here

• Explain the Android push notification system? Learn from here: How does the Android push notification system work?

• What is AAPT? - Learn from here

• FlatBuffers vs JSON.

• HashMap, ArrayMap and SparseArray - Learn from here

• Advantages of SparseArray in Android - Learn from here

• What are Annotations? - Learn from here

• How to create custom Annotation? - Learn from here

• What is the Android Support Library? Why was it introduced? - Learn from here

• What is Android Data Binding?

Android Libraries

Android Interview Questions and Answers:

• Explain OkHttp Interceptor - Learn from here

• OkHttp - HTTP Caching - Learn from here

• How to enable logging in OkHttp? - Learn from here

• Why do we use the Dependency Injection Framework like Dagger in Android? - Learn from here

• Explain @ Inject, @ Module, @ Provides, @ Component Annotations in Dagger 2 - Learn from here

• How does the Dagger work?

• How will you choose between Dagger 2 and Dagger-Hilt?

• What is a Component in Dagger?

• What is Module in Dagger?

• How does the custom scope work in Dagger?

• When to call dispose and clear on CompositeDisposable in RxJava? - Learn from here

• What is Multipart Request in Networking?

• What is Flow in Kotlin? - Learn from here

• App Startup Library - Learn from here

• Tell me something about RxJava.

• How will you handle error in RxJava?

• FlatMap Vs Map Operator - Learn from here

• When to use Create operator and when to use fromCallable operator of RxJava? - Learn from here: RxJava Create and fromCallable Operator

• When to use defer operator of RxJava? - Learn from here: RxJava Defer Operator

• How are Timer, Delay, and Interval operators used in RxJava? - Learn from here

• How to make two network calls in parallel using RxJava? - RxJava Zip Operator

• Tell the difference between Concat and Merge. - Learn from here and here

• Explain Subject in RxJava? - Learn from here

• What are the types of Observables in RxJava? - Learn from here: Types Of Observables In RxJava

• How to implement search feature using RxJava in your application? - Learn from here: Instant Search Using RxJava Operators

• Pagination In RecyclerView Using RxJava Operators - Learn from here

• How The Android Image Loading Library Glide and Fresco Works? - Learn from here, here and here

• Difference between Schedulers.io() and Schedulers.computation() in RxJava.

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

Android Architecture

Android Interview Questions and Answers:

• Describe the architecture of your last app.

• Describe MVVM. - MVVM Architecture

• MVC vs MVP vs MVVM architecture.

• Clean Architecture - Learn from here

• MVI - MVI (Model-View-Intent) Architecture in Android

• Software Architecture vs Software Design - Learn from here

• Benefits of Multi-Module Architecture - Learn from here

• Multi-Module Project: Why and When? - Learn from here

Design Pattern

Android Interview Questions and Answers

• Builder - Learn from here
• Singleton
• Factory - Learn from here
• Observer - Learn from here
• Repository
• Adapter
• Facade
• Dependency Injection
• Strategy Pattern - Learn from here
• Design Pattern used in Android - Learn from here
• Kotlin Optional Parameters vs Builder Pattern - Learn from here
• Examples of the Observer pattern used in Android - Learn from here
• Design Pattern Used in Retrofit Library Source Code - Learn from here
• Design Pattern used in Glide (Image Loading Library) - Learn from here
• Design Patterns used in AOSP (Android Open Source Project) - Learn from here

Android System Design

Android Interview Questions and Answers:

Refer to this blog: Android System Design Interviews

• Design an Image Loading Library - Learn from here, here and here

• Design File Downloader Library - Learn from here

• Design WhatsApp

• Design Instagram Stories

• Design Networking Library

• Design Facebook Near-By Friends App

• Design Caching Library.

• Design problems based on location-based app

• How to build an offline-first app? Explain the architecture

• Design LRU Cache

• Design Analytics Library

• Design Logging Library - Learn from here

• HTTP Request vs HTTP Long-Polling vs WebSocket vs Server-Sent Events - Learn from blog and Video - HTTP Request vs HTTP Long-Polling vs WebSocket vs Server-Sent Events

• How do Voice And Video Call Work? - Learn from here

• In an Android App, how do you handle data syncing when the network isn’t stable? - Handling Android Data Sync on Unstable Networks

• Design Uber App - Learn from here

• How "Where Is My Train" Works Without Internet? - How "Where Is My Train" Works Without Internet?

• Database Normalization vs Denormalization - Database Normalization vs Denormalization

• Hash vs Encrypt vs Encode - Learn from here

• Webhook vs Polling - Learn from here

• Options for real-time updates in an Android App - Learn from here

• Options for Network Optimization in a Mobile App - Options for Network Optimization in a Mobile App

• Firebase Remote Config in Android - Firebase Remote Config in Android

• Accurate time in Android - Learn from here

• Query Optimization in SQLite for Better Performance - Learn from here

• WebSocket vs Socket.IO - Learn from here

• Symmetric vs Asymmetric Encryption - Learn from here

• SMS Retriever API in Android - Learn from here

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

Android Unit Testing

Android Interview Questions and Answers:

• Unit Testing ViewModel with Kotlin Coroutines and LiveData - Learn from here

• Unit Testing ViewModel with Kotlin Flow and StateFlow - Learn from here

• What is Espresso? - Learn from here

• What is Robolectric? - Learn from here

• What are the disadvantages of using Robolectric? - Learn from here

• What is UI-Automator? - Learn from here

• Explain the unit test. - Learn from here

• Explain instrumented test. - Learn from here

• Why Mockito is used? - Learn from here

• Describe code coverage. - Learn from here

Android Tools And Technologies

Android Interview Questions and Answers:

• CI/CD Pipeline for Android - Learn from here

• What is ADB? - Learn from here

• 16 KB page size for Android Apps - Learn from here

• What is the StrictMode? - Learn from here: StrictMode

• What is Lint? What is it used for?

• Android App Release Checklist For The Production Launch - Learn from here: Android App Release Checklist For The Production Launch

• Git.

• Firebase. - Learn from here

• How to measure method execution time in Android?

• Can you access your database of SQLite Database for debugging? - Learn from here

• What are things that we need to take care while using Proguard?

• How to use Android Studio Memory Profiler?

• What is Kotlin DSL for Gradle? - Learn from here

• implementation vs api in Gradle - Learn from here

• What is Gradle?

• Gradle related files in Android Project - Learn from here

• How do you create a custom task in Gradle? - Learn from here

• annotationProcessor, kapt, ksp in Gradle - Learn from here

• Build Variants in Android - Learn from here

• Desugaring in Android - Learn from here

• APK Size Reduction.

• How can you speed up the Gradle build?

• About gradle build system.

• About multiple apk for Android Apps.

• What is ProGuard used for? - Learn from here

• What is proguard-rules.pro file used for? - Learn from here

• ProGuard vs R8 in Android - Learn from here

• What is obfuscation? What is it used for? What about minification?

• How to change some parameters in an app without app update? - Firebase Remote Config in Android

• What is Write-Ahead Logging (WAL) and why it is used internally in databases? - Learn from here

Jetpack Compose

Topics you should know in Jetpack Compose for Android Interview:

• Compose
• State: remember, rememberSaveable, MutableState
• Recomposition
• State hoisting
• Side-effects
• Modifier
• Theme
• Layout, List
• Gestures, Animation
• CompositionLocal
• Phases

Learn the above-mentioned from the following links:

• Getting Started with Compose
• Thinking in Compose
• State
• remember vs rememberSaveable
• Lifecycle
• Modifiers
• Side-effects
• Phases