Best Android Interview Questions And Answers

So you're interviewed for an Android developer job? You have chosen the best clothes, your resume and other reference materials are neatly assembled and ready, and you feel well-rested. 

Unfortunately, you begin to realize that you may be asked a question that you do not have an answer to. After all, it takes a lot to be an Android developer. Are you sure you want to risk getting stumped when answering simple Android developer interview questions?

Or maybe you are also hiring Android developers and don't know how to assess a candidate's knowledge during an interview? 

This free list will help you learn what skills to assess and ask Android developers in interviews. 

Here we have:

  • junior android developer interview questions
  • middle android developer interview questions
  • android interview questions for senior developer

Plus, you can use these templates as android team lead interview questions.

This approach shed light on the candidate's attitude towards Android programming!

Junior Android Developer Interview Questions

01

To start with, what is Android?

Android is an open-source Linux-based operating system commonly used on mobile devices such as smartphones and tablets. It is a kernel-based system that gives developers the ability to develop and deploy simple and/or advanced applications.

02

What version of Android is it now, and how old is it?

The current Android version is 11.0, released in 2020.

03

What database is used for the Android OS?

SQLite, a standalone open-source serverless database, is built into Android by default.

04

What is the architecture of an Android application?

The android architecture consists of:

  • Android Framework
  • Android Apps
  • Linux kernel
  • Libraries

05

Can I change the name of the application after deploying it?

While you CAN change that, the real question must be, "SHOULD you"? Changing the name of an application may impair some of its functionality.

06

What are the main tools for developing applications for Android?

Development tools:

  • JDK
  • SDK tools
  • Eclipse Plugin + ADT

07

List of Android advantages.

The four main benefits of Android are:

  • Open source, so it's free.
  • It is platform-independent. Therefore it supports Linux, Windows, and Mac.
  • It supports a number of various technologies such as Bluetooth, speech, cameras, Wi-Fi, etc.
  • It uses DVM (Dalvik Virtual Machine), a highly optimized virtual machine.

08

Explain the Android SDK.

It is a set of tools that Android developers use to develop or write applications. It has a graphical user interface that mimics a portable Android environment, making it easier for devs to create, test, and debug their code.

Tools include:

  • Dalvik Debug Monitor Services
  • Android emulator
  • Android Asset Wrapping Tool
  • Android Debug Bridge

09

Speaking of emulators, why is it so crucial for devs to have access to one of them?

Because emulators function like real handheld devices, developers have a nice dedicated sandbox to create safely, edit, test, and debug new applications to see how they work on a real device without risking the real device.

10

What languages ​​does Android use?

Android mainly uses Java and Kotlin but also supports C / C ++, which will run faster when used with the Android SDK.

Mid Android Developer Interview Questions

01

What is an Android framework?

It is a set of APIs that allows developers to build applications and consists of:

  • Intention
  • Activities
  • Content providers
  • Others

02

What is intent in the context of Android? Describe the different types.

Be that as it may, it is the intent to perform an action, a message that is passed between components. Intents request actions from another component, such as sending an email, opening a web page, or launching a given action. There are two types:

  • Implicit intent

    Here, the intent does not define the target component, requiring the Android system to evaluate the components.
  • Explicit intent

    Explicit intent, on the other hand, directly identifies the target component.

03

What is sticky intent?

This is a broadcast using the send sticky broadcast () method. The intent remains after the broadcast, allowing others to collect data from it.

04

What are activities?

These are the parts of the mobile application that the user sees and interacts with. It is a graphical user interface (GUI) representing a single Android screen.

05

What are the four basic states of an activity?

Four states:

  • Active: The action is at the top of the stack, running in the foreground.
  • Suspended: The activity is still displayed but cannot receive user input events. it's in the background
  • Stopped: The action is invisible and therefore paused and hidden or hidden by another action.
  • Destroyed: The action process has been terminated, completed, or terminated.

06

What is a content provider?

Content providers exchange information between different Android applications. They allow users to access data in the application. Examples include contact information, images, video, and audio.

07

Explain what Android Toast is.

In this case, a toast is a pop-up window (hence the word) giving feedback on a user-initiated operation, informing the user about the current status of said operation. For example, when a smartphone user sends a message to a friend, a toast is displayed with the words “send a message.”

08

What is the difference between testing mobile devices and testing mobile applications?

Mobile testing is performed on the mobile device itself, in particular in device functions such as Contacts, SMS, browsers, and the calling function. Mobile application testing samples the capabilities and functionality of applications downloaded to a mobile device.

09

What is a "package" in Android?

Packages are used to transfer the required data to subfolders.

10

How do you define view elements in an Android program?

Use the findViewById keyword.

Senior Android Developer Interview Questions

01

Does Android have any drawbacks?

The weaknesses of Android stem from one of its strengths, namely that it is available everywhere and can run on a wide variety of devices.

  • First of all, developers can find it difficult to create apps that easily adjust the display to fit the different screen sizes of all these different devices.
  • Second, the large number of devices has led to the emergence of a large number of individual versions of Android that suit them, so there is no single set of policies governing updates or settings to work on many operating systems. There is anarchy!

02

Can bytecode written in Java work on Android?

No, it can’t.

03

What is AAPT?

It is an abbreviation for Android Asset Packaging Tool. This tool gives developers the ability to work with zip-compatible archives, including viewing, creating, and extracting content.

04

What is ADB?

This acronym stands for Android Debug Bridge (a tool included with the SDK). It is a command-line tool used to exchange data between emulator instances.

05

What does APK mean?

It is short for Android Packaging Kit. Each file in the Android packaging key is compressed into one file - the APK.

06

Explain ANR.

It is an acronym for Application Not Responding, a pop-up or notification that is triggered when an application experiences a delay for the user due to too many functions running concurrently.

07

How do you host layouts in Android? Where are they located?

They are placed as XML files in the layout folder.

08

Give some examples of Android exceptions.

Exceptions include:

Inflate the exception

  • Surface.OutOfResourceException
  • SurfaceHolder.BadSurfaceTypeException
  • WindowManager.BadTokenException

09

What are the four main elements in every Android project?

Six main elements:

  • AndroidManifest.xml
  • build.xml
  • bin /
  • src /
  • res /
  • resources/

10

List four supported Android dialog boxes.

Four dialog boxes:

  • Alert Dialog: Contains selectable items such as radio buttons and/or checkboxes.
  • Progress Dialogue: Shows progress, either through a progress wheel or on a lane.
  • Date picker dialog: allows the user to select a date
  • Timing Dialogue: it allows the user to select a time

11

The Android app keeps crashing. How to solve the problem?

When an application crashes frequently, these are the best ways to fix it:

  • This could be a memory issue. Make sure there is enough space in memory.
  • Clear app data by clearing cache memory using "settings" in the app manager.
  • Not all applications work the same on different machines, so you might have to tinker with memory management.
  • This could be a compatibility issue; A problem that can be solved by pre-testing the application on as many devices as possible.
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