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Android Interview Questions

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by Ruchitha Geebu
Last modified: July 16th 2021

If you're looking for Android Interview Questions for Experienced or Freshers, you are in right place. There are a lot of opportunities from many reputed companies in the world. According to research, Android has a market share of about 0.7%. So, You still have the opportunity to move ahead in your career in Android Development. Mindmajix offers Advanced Android Interview Questions 2021 that help you in cracking your interview & acquire a dream career as Android Developer.

Top Android Interview Questions

  1. What is Android?
  2. Write another calling activity in android?
  3. What is ANR?
  4. What is the Android application Architecture?
  5. Could you explain the term An Activity?
  6. Define the APK format?
  7. Define Intent?
  8. Do you know the founder of Android?
  9. Are there any specific names of Android Codes?
  10. Why has Android gained so much popularity? What is making people choose this option?

Android Interview Questions and Answers

1. What is Android?

It is a compilation of all the software which is designed especially for mobile devices. This version is compatible with Smartphones and includes an operating system and some key applications. The application results in the execution of the process and the Dalvik Virtual Machine.

Related Article: What is Android    

2. Write another calling activity in android?

  1. Intent i = newIntent(getApplicationContext(), ActivityTwo.class);
  2. startActivity(i);

3. What is ANR?

ANR stands for Application Not Responding, a dialog box that appears if the application is no longer responding.

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4. What is the Android application Architecture?

There are certain components that together make the Android application architecture. It includes:

  1. Services: That together creates the functionality to be performed in the background
  2. Internet: It is performed for the internal connection between the activities and the mechanism that is passed through the data.
  3. Resource examination: It includes strings and graphics
  4. Content providers: It includes the data between the applications that are shared
  5. Notification: It includes notification, light, sound, dialog box, and icon to name a few

5. Could you explain the term An Activity?

It is all about the performance action which is done on screen. If you want to go ahead and conduct any kind of operation, you are allowed to do so with the help of an activity

6. Define the APK format?

APK is an abbreviation of the Android packaging key. It encompasses the UI, Classless, manifest and supportive assets to name a few. There are some of the files which are together compressed in a single document. This document is called the APK.

Related Article: Services in Android    

7. Define Intent?

There is a connection between the internal and external world of application. This connection is called intent. For some of the examples, if you open a PDF, there is an intent that is then connected to the web browser.

8. Do you know the founder of Android?

The founder of android was Andy Rubin who has literally changed the world and defined technology in an all-new way.

9. Are there any specific names of Android Codes?

  •  Blender
  • Donut
  • Froyo
  • Honeycomb
  • Astro
  • Cupcake
  • Eclair
  • Gingerbread
  • Ice Cream Sandwich
  • Kitkat
  • Marshmallow
  • Jelly Bean
  • Lollipop

These are some of the popular versions that Android has released so far. There are still many going to come but no doubt each version has been introduced with some specific concept.

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10. Why has Android gained so much popularity? What is making people choose this option?

The prime reason for its popularity is free usage. Furthermore, it comes with:

  • Open source: In this, there is no distribution, license, or development charge which is being included
  • Technology gets support: It is all about the Bluetooth, camera, Wi-Fi, speech, and Edge to name a few that are being supported with it
  • Independent platform: It offers Mac, Windows, and even Linux-based platforms for user-friendly solutions.
  • Virtual machine with better optimization: Android with the help of a well-optimized virtual machine choose the DVM called Dalvik Virtual Machine

11. Is there any language other than Java that is being used in Android:

Android app is loaded with different programming languages. You can develop it with C, C++, and even the Native Development Kit. The result is, of course, the best which is extremely good performance and a faster solution.

Related Article: Android Activity Lifecycle

12. Why standard Java bytecode can run on Android?

As you know Dalvik Virtual Machine is the platform that Android uses. It certainly needs a bytecode for smooth functioning. To make sure all the files are into Dalvik Executable files, the conversion of Java class files in Dalvik needs to be done. This can be done with the help of a tool known as  “dx”. Generally, a developer is not responsible for building such type of tool.

13. Is it possible to program android applications in Java?

Though java language is used for Android that does not necessarily mean that you can always program the application is the same language. However, you have a scope to create the application in native-code languages like C or C++

14. Where can you declare the activity to make sure the system gets the access:

To make sure activity is declared needs to be present the file of manifest 

15. Could you explain the difference between an implicit intent and explicit intent?

There are two types that you need to know which are:

  1. Implicit: It is related to the calling of the default systems such as sending email, SMS, or even the dial number.
  2. Explicit intent: it is associated with the component related to the activity. In short, we also call it an activity done by the explicit

16. Explain the core building blocks of android:

As a developer, it is important for the person to understand the Android blocks. No doubt there are many but the selective ones are mentioned below. The core building blocks of android are categorized into:

  • View
  • Service
  • Activity
  • Intent
  • Content Provider
  • Fragment etc.

17. Can you name the different storage methods in Android?

Android is a platform that offers a variety of options for data persistence. There are some shared choices called the storage for private yet crucial data. It is stored in the pairs called the Key-Value. It often gets quite restricted as it provides the value pairs-based key. It is not possible to save your own type of Java. Other than this comes internal storage which focuses on storing the private data on the memory of the Smart Phone.

18. Can you describe Action present in Android?

There is a description of the intent sender which it requires which is called the action. It is included in Syntax and is comes with a description where the action is added to an intent filter. There is an element that shall have more than 2 elements. If it does not contain any then there is no intent object that will get from the filter.

19. Could you explain the dialog boxes that can be used in the Android Application?

It consists of some of the parts such as:

  • DatePickerDialog: This term is used by the user for time selection
  • AlertDialog: It is an alert box of dialogue that contains 3 buttons with a selectable elements list
  • ProgressDialog: This one is the extension that you might want to some buttons with it. It generally describes the progress bar
  • TimePickerDialog: This is used by the user for time selection
Related Article: Android Activities

20. Could you explain in detail the life cycle methods that android activity consists of?

Generally, this type of lifecycle is controlled with 7 methods. The prime focus of android Activity is to create a subclass of the Context Theme Wrapper class. It consists of:

  1. onStart()
  2. onPause()
  3. onRestart()
  4. onCreate()
  5. onResume()
  6. onStop()
  7. onDestroy()

21. What is the right kennel that can be used in Android:

Since there are so many platforms but when it comes to Android the right one to choose is Linux 3.6 kernel

22. Do you know about the Android application Widgets

It is nothing but the small application views which you can easily embed in some other application and thus get the updates on a periodic basis.

23. What are the flags types by which Android Application runs

The flags are categorized into two types for running the Android Application:

  1. LAG_ACTIVITY_NEW_TASK
  2. FLAG_ACTIVITY_CLEAR_TOP

24.  Could you explain in detail about a singleton class?

In Android, there are calls that create an object which you can share with other classless. This class is nothing but a singleton. 

25. Could you name the resource in which there is a compilation of the visual resource and which you can use as a background, title, and in other screen parts?

There is a virtual resource that is generally used for different purposes such as title, background, and even in other screen parts. It is called Drawable. It is generally stored in the files of the individuals or maybe sometimes in drawable factors. There is an ADT project which is created and you will also have to store the bitmaps for some resolutions in subfolders of Drawable. If such bitmaps are offered in other folders, the option is on the Android system for selecting the right option that would on its own make the choice depending on the configuration of the device.

26. Is there a possibility to make two Android applications with the same ID of Linux for sharing?

The application needs to sign with the same certificate to make sure that they share the same user ID and even the VM. There is no hard and fast rule but certainly, to make the right use of it, it is important to understand the right process. This way, it becomes possible to go with the flow and get accurate results which are important.

27. Is there any way for deployment which you can execute for JARs on Android?

There is no such way since the Android platform cannot support the JAR deployments effectively. Applications that are packed in the Android Package with the help of Android Asset Packaging software are later deployed for the platform of Android. This tool is offered by Google for the eclipse.

28. Can you change the application name once it gets deployed?

Generally, it is not advised for changing the name of the application once it gets deployed. Since this action will break certain functions there is a huge risk involved. Supposedly, there will no shortcuts that would work if you change the name of the application. It is of course possible to change but once the name is deployed, changing it makes no sense due to the huge loss risk.

29. Define ANR notification that is present in Android

ANR is an abbreviation of Application Not Responding. Generally, this dialog is popped up in the Android system if the application is performing too many tasks on the main platform and becomes unresponsive for quite a long time. It is more like the system gets slowed down since too many applications becomes a burden and all of a sudden all the applications stops responding or shuts down automatically

30. Could you elaborate on the three key loops that would help you monitor the activity?

Android is the ultimate platform that offers a great solution. However, each activity is tracked down and for this, there is a loop. This helps in mentoring the activity. It is categorized into three things which are

  • Visible lifetime – there is an activity taking place between onStop with onStart
  • Entire lifetime – there is an activity taking place between onCreate with onDestroy
  • Foreground lifetime – there is an activity taking place between onPause with onResume

31. Name the basic tools that are used to develop an android app?

Generally, an android app is categorized into:

  1. Eclipse+ADT plugin
  2. JDK
  3. SDK Tools

32. How can you prevent ANR?

There is a technique that prevents the Android system from drawing the conclusion finally. There is a code that has been pretty much responsive for quite a long time. It is used for creating a child threat. Once the child thread is made, there are some of the actual parts of the codes which you can place. This way it is possible for the main threats to run at the less period that is related to unresponsive timing.

It is always better to learn and understand these interview questions. Prepare yourself well in advance for better success.

About Author

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NameRuchitha Geebu
Author Bio

I am Ruchitha, working as a content writer for MindMajix technologies. My writings focus on the latest technical software, tutorials, and innovations. I am also into research about AI and Neuromarketing. I am a media post-graduate from BCU – Birmingham, UK. Before, my writings focused on business articles on digital marketing and social media. You can connect with me on LinkedIn.