Ace android app developer interview with Top 100+ questions

Interviews can be one of the scariest situation for most of us and it becomes even more difficult if you can’t find suitable resource to fully prepare yourself for an interview.

The single most objective of this course is to instill supreme confidence in you with which you can crack any android interview.

To overcome this fear for an android interview, let me present my brand new course with a new learning objective.

COURSE HIGHLIGHT

Will the practice tests asks questions like what is an activity or what is fragment in android or what is MVVM?

Well, sorry, no it doesn’t ask the definition of termslike activities or fragments or view models. Those are basics terms and concepts which the companies hiring for android developer role expects you to know

Instead, the practice tests presents the scenarios like below, and tests your understanding as an android developer.

The app needs to provide location updates, and when it is sharing location updates, it must display a notification to the user. This notification should be visible at all times. The user should be able to dismiss the notification, but the location updates should continue to run in the background.

How you will implement it as an android developer?

A. Foreground service

B. Work Manager

C. Kotlin Coroutines

D. Service

Of course, you might or might not know the answer for this, but the interviewer may asks you follow up questions or asks you to justify why you will chose a foreground service or a work manager in above scenario and this tests your understanding of which android-provided component to chose and when.

To build that confidence to answer any follow up discussion, you will find an Explanationlike below,

Foreground services are useful in Android apps when you need to perform an operation that is noticeable to the user, even when they’re not directly interacting with the app.

For example, a foreground service could be used to:

• Play music in the background

• Download a file

• Upload data

• Keep the device’s screen on

• Provide location updates

Foreground services can display a notification to the user. This notification must be visible at all times while the service is running. The user can dismiss the notification, but the service will continue to run in the background. Thus the foreground service fulfills all the requirements mentioned in the scenario question.

Foreground services are a powerful tool for performing background operations in Android apps. However, they should only be used when necessary.

If you can perform an operation without using a foreground service, then you should do so. This is because foreground services can drain the device’s battery and can interrupt the user’s experience.

Here are some of the benefits of using a foreground service:

• The service will be run even when the app is not in the foreground.

• The service will not be killed by the system when the device is low on memory.

• The user will be notified that the service is running.

Here are some of the drawbacks of using a foreground service:

• The service can drain the device’s battery.

• The service can interrupt the user’s experience.

• The service requires the FOREGROUND_SERVICE permission.

Ultimately, the decision of whether or not to use a foreground service depends on your specific needs.

If you need to perform an operation that is noticeable to the user, even when they’re not directly interacting with the app, then you should use a foreground service.

However, if you can perform an operation without using a foreground service, then you should do so.

Sample code is provided for the implementation

Reference: A link to official android document is provided

And this detailed explanation and sample code pattern/format you will see for all 100+ questions, across the 4 practice tests.

The practice tests contains 100+ android interview questions, which compiled from below resource,

• My own experience as an android developer. I am working as an android app developer since 2009 and have conducted more that 200+ android interviews for both junior, senior android developers and also for android/mobile architects. 

• Stack overflow site, which is go-to site for any android developer and it contains many frequently asked questions

• Official android documentation.

• Interview questions asked by my office mates while taking interviews for both product based and service based companies.

What topics are covered?

• UI development topics: activities, fragments, relative, linear and constraint layouts, view binding, data binding, custom views, app bar, Tool bar, Dialogs

• Background tasks and android networking : Services, Work manager, Retrofit, JSON parsing, JSON Object, JSON Array, Kotlin Flow and Coroutines, Foreground services

• Architecture components :Data Store,View Model, Live Data, Kotlin Flow, LifeCycle aware components

• Jetpack compose :Rows, Columns, Lazy columns, managing the state in Jetpack compose.

• Navigation:Drawer layout, Bottom Navigation bar, Side navigation

• Security :Encrypted shared preference, How to store the API key using Gradle plugin

• App publishing: Android app bundle, Publishing the app to Play console best practices and requirements

• Debugging and testing : Android Instrumentation testing, unit testing, stress testing, Firebase Lab testing options. Debugging tools.

And many more.

Trust me, you will be super charged and will be itching to crack that android interview with these 100 android questions and their detailed explanation under your kitty.

Come, join in & get ready to earn your job as an android professional. All the best!

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