UPDATED: Common Android Developer Interview Questions and Answers

As an experienced Android developer, I have been through numerous job interviews, both as a candidate and an interviewer. While every interview is unique, there are some common questions that are asked in almost every Android developer interview. Whether you are a seasoned professional or a fresh graduate looking for your first job, it is crucial to prepare for these questions to increase your chances of landing the job.

In this article, I will share with you some of the most commonly asked Android interview questions and provide you with the answers that will help you stand out from the competition. We will cover a range of topics, including Java and Kotlin, Android architecture, design patterns, and more. So, let’s get started and prepare for your next Android job interview!

Here is a list of common question and answer that I’ve been challenged during a long and interminable interviewing phase of my life:

[May 16th 2023] Comment for sharing other relevant questions to add in this up to date list.

• What is the purpose of a Coroutine Scope in Kotlin coroutines and how are nested Coroutine Scopes used?

A CoroutineScope in Kotlin coroutines is an interface in the kotlinx.coroutines package that provides a structured way to manage coroutines and their execution context. It allows you to control the lifecycle of coroutines, specify the execution context for coroutines, and handle exceptions and cancellation. Nested CoroutineScopes can be used to create a hierarchy of scopes, where child scopes inherit the context of their parent scope, enabling you to organize and structure coroutines while controlling their execution context more precisely.

• What is MVVM in Android app development?

MVVM is a design pattern that separates the UI, business logic, and data layers of an Android application. The Model represents the data and business logic, the View displays the UI, and the ViewModel manages the communication between the View and the Model. MVVM is useful because it promotes separation of concerns and makes the code more modular, maintainable, and testable.

• What is the role of a Repository in MVVM, and how does it work?