Code360 powered by Coding Ninjas X Naukri.com. Code360 powered by Coding Ninjas X Naukri.com
Table of contents
1.
Introduction
2.
Android Interview Questions for Freshers
2.1.
What is Android? What are some features of the Android architecture? 
2.2.
What are the components of an Android application?
2.3.
What are the differences between Activities and Services?
2.4.
What are the advantages of Android?
2.5.
What do we mean by the terms ADB and DDMS?
3.
Android Interview Questions for Experienced
3.1.
What is the lifecycle of an Android activity?
3.2.
What is the importance of the Android Manifest file?
3.3.
What are some common troubleshooting techniques to detect the reasons why your Android application crashed?
3.4.
What is the database used in Android applications?
3.5.
What is a Job Scheduler?
4.
Android Rapid Fire Interview Questions
4.1.
What is the Google Android SDK?
4.2.
What is the full form of AAPT?
4.3.
What are containers in Android?
4.4.
What are the different types of Orientation that are available?
4.5.
When is an activity said to be visible?
5.
Frequently Asked Questions
5.1.
What is the significance of the .dex file?
5.2.
What is the toast in Android?
5.3.
What is the Alert Dialog Box in Android?
6.
Conclusion
Last Updated: Mar 27, 2024
Easy

Most Asked Android Interview Questions and Answers in 2023

Author Vasu Bansal
0 upvote
gp-icon
Interview guide for product based companies
Free guided path
12 chapters
99+ problems
gp-badge
Earn badges and level up

Introduction

In this blog, we will see some of the famous and important questions that are quite commonly asked in Android developer interview question. For smooth development of Android applications, you need to set up an IDE like Android Studio along with the Android SDK. Feel free to refer to the blog Android Studio and Environment Setup on the Coding Ninjas Website to go over the details to set up your environment.

In this article, we have collected many Android interview questions. These questions will help you crack the Android interview and land your dream job. 

Let's see the solutions to various Android interview questions.

Android Interview Questions for Freshers

What is Android? What are some features of the Android architecture?
 


Android is a famous operating system. The founder of Android is Andy Rubin. It is an operating system designed especially for mobile phones and tablets.

There are multiple layers in the Android stack, referred to as the Android architecture. There are five layers present in the Android architecture. They are as follows.

1. Linux Kernal
2. Libraries
3. Android Runtime
4. Android Framework
5. Android Applications

Feel free to refer to the blog Android Architecture on the Coding Ninjas Website to read and learn more about the architecture of Android.
 

What are the components of an Android application?


An Android application is composed of a few essential building blocks. The manifest file of our Android application provides a description of each component and binds these loosely connected components. The app's metadatadevice setupplatform requirementsexternal libraries, and required permissions are all included in the manifest file. An android app is made up of the following main components as listed below:

1. Activities
2. Services
3. Content Providers
4. Intents
5. Broadcast Receivers
6. Widgets
7. Notifications

Feel free to refer to the blog Android App Components on the Coding Ninjas Website to read more about this.
 

What are the differences between Activities and Services?


Both activities and services are components of an Android application. Yet there are some differences between them. For example, activities are designed to execute only in the foreground and can be killed by the user. On the other hand, services are designed to execute in the background. They can even run when the application is not running actually. 

Feel free to navigate to the blogs Android Activities and Android Services on the Coding Ninjas Website to have in-depth knowledge about both these topics.
 

What are the advantages of Android?


There are many advantages associated with Android. Unlike many other operating systems, Android is open source, i.e. everyone can use it without even paying anything. Android development is independent of the platform, i.e. one just needs to install Android Studio and set up the Android environment before actually starting making applications. Feel free to refer to the blog Android Studio and Environment Setup on the Coding Ninjas Website to go over the details to set up your environment. Android provides support for all the latest technologies like Bluetooth, Wifi, Camera, Mobile hotspots, etc.
 

What do we mean by the terms ADB and DDMS?


ADB stands for Android Debug Bridge. It is a command-line interface/tool. It provides us with a way to interact with the instance of an emulator through the command-line interface. 

DDMS stands for Dalvik Debug Monitor Server. It is a very famous debugging tool used for debugging Android applications. Some of the features provided by DDMS include screen capturing, network trafficking, port-forwarding services, location data spoofing, etc.

Get the tech career you deserve, faster!
Connect with our expert counsellors to understand how to hack your way to success
User rating 4.7/5
1:1 doubt support
95% placement record
Akash Pal
Senior Software Engineer
326% Hike After Job Bootcamp
Himanshu Gusain
Programmer Analyst
32 LPA After Job Bootcamp
After Job
Bootcamp

Android Interview Questions for Experienced

What is the lifecycle of an Android activity?


An Android activity lifecycle is the different states that activity goes through in Android. To give an analogy, we consider the lifecycle of a human being. A human being goes through four stages throughout his life: the child stage, followed by the teenage stage, followed by the adult age, and at last, followed by the old-age stage. Similarly, an activity goes through multiple states. 

The activity class provides a set of six callbacks to navigate transitions between stages of the activity lifecycle. They are listed as follows:

a. onCreate()
b. onStart()
c. onResume()
d. onPause()
e.  onStop()
f.  onDestroy()
 

What is the importance of the Android Manifest file?


The manifests folder possesses the AndroidManifest.xml that is used to create the Android application. This file contains details about our application, such as the Android versionmetadata, the states package for the Kotlin file, and other components. It serves as a bridge between the android operating system and our application.

The directory structure of the manifests folder in our Android application looks as follows.



Feel free to refer to the blog Android Directory Structure on the Coding Ninjas Website to learn more about the directory structure of our Android projects.
 

What are some common troubleshooting techniques to detect the reasons why your Android application crashed?


If your Android application is frequently crashing, there could be many reasons behind this. For example, one of the reasons could be a memory issue. Some mobile phones might not have enough space and might have a low computing power processor. Sometimes, it might be the case that an application cache takes up a lot of space. So cleaning the application cache can also fix the problem. If some important files of the application are corrupted, re-installing the application can solve the problem. There can also be compatibility issues that may be causing the application to crash. Therefore before releasing the application, you should test it on different kinds of devices with different OS installed on them.
 

What is the database used in Android applications?


SQLite is the database that is used while creating Android applications. It is an open-source relational database (RDMS), and its engine is transactional, serverless and self-contained. The SQLite engine is properly linked with the Android application, due to which we can make access to the database faster. This is not the case with other databases.
 

What is a Job Scheduler?


Job Scheduler is an API for scheduling different types of jobs. It provides support for batch scheduling of jobs and performs a range of functions, including reducing battery consumption, handling network unreliability, enhancing application performance, etc.
 

Also see,  Operating System Interview Questions

Android Rapid Fire Interview Questions

What is the Google Android SDK?


We can easily write applications on Android enabled devices with the help of a toolset provided by Google. This toolset is known as Google Android SDK. It gives us a GUI for debugging and testing our applications.
 

What is the full form of AAPT?


AAPT stands for Android Asset Packaging Tool. It is again a tool that is made for developers, which helps them in creating, viewing and extracting the contents of a zip file.
 

What are containers in Android?


Containers are similar to their real-life counterpart’s meaning. They hold a bunch of widgets together and decide the properties and arrangements of these widgets.
 

What are the different types of Orientation that are available?


There are two different types of orientation that are available and can be set using the setOrientation() function. The orientations are namely HORIZONTAL or VERTICAL.
 

When is an activity said to be visible?


An activity is said to be visible if the user directly uses it or it is partially hiding behind another activity. It is important to note that visible activities may not be directly available in the foreground itself.

Frequently Asked Questions

What is the significance of the .dex file?

Dex stands for Dalvik Executable file. Android programs are compiled to this format first, i.e., .dex files, which are later zipped to a .apk file later. 

What is the toast in Android?

Sometimes, it is required to pop up a message on the user's screen in case an event occurs. This can be achieved with the help of Toast in Android.

What is the Alert Dialog Box in Android?

The Alert Dialog Box is used to display an alert message to the users of our Android application. It is used primarily to re-confirm from the users their respective decisions, thereby preventing cases of an accidental click of buttons.

Conclusion

In this article, we have extensively discussed the important Android Interview questions. We hope this blog has helped you enhance your knowledge regarding Android interview questions. 

Recommended Readings:

 

The responses to the questions are crisp and to the point. Thus, making you all ready for Android interview questions.

If you want to learn more, check out our Android Development Course on the Coding Ninjas Website to learn everything you need to know about Android development. Do upvote our blog to help other ninjas grow. Happy Coding!

Previous article
Capgemini Interview Questions
Next article
Top Machine Learning Interview Questions & Answers (2023)
Guided path
Free
gridgp-icon
Interview guide for product based companies
12 chapters
123+ Problems
gp-badge
Earn badges and level up
Live masterclass