What are the most asked Android Interview Questions and Answers in 2023 ? For Fresher and Experienced Developers Must Know these Questions & Answers.
Welcome here, In this article we will discuss about most asked questions in android job interviews. You must have knowledge about these there are many software companies interviews overviews. These are most commonly asked in Android Development. This article is divided into 2 section of questions (Freshers) and (Experienced) android developers.
Android Jobs interview Questions and Answers
Note:- If you are a fresher, Student, or beginner in android development than you must know these basic concepts, before going for an interview.
Android Development interview questions for fresher
- What is Android? Ans: Android is an open-source mobile operating system developed by Google. Which is based on the Linux kernel and is designed primarily for the touchscreens mobile devices such as smartphones and tablets.
- What is the main difference between a fragment and an activity? Ans: An Activity represents a single screen with a user interface, while a Fragment represents a portion of the user interface in an Activity. Fragments are reusable components that can be used in multiple activities.
- What is the Android Manifest file? Ans: The Android Manifest file is an XML file that contains important information about the application, such as its package name, activities, services, permissions, etc. It is used by the Android system to identify the application and its components.
- What is an Intent in Android? Ans: An Intent is a messaging object used to request an action from another component of the Android system, such as an Activity, Service, or Broadcast Receiver. It can be used to start an Activity, start a Service, or broadcast a message to other components.
- What is an APK in Android? Ans: An APK (Android Package Kit) is the package file format used by the Android operating system to distribute and install mobile applications. It contains all the necessary files and resources needed to install and run the application on an Android device.
- What is the Android Architecture? Ans: The Android Architecture is a layered architecture that includes four main layers: the Linux kernel layer, the Native layer, the Framework layer, and the Application layer. The layers work together to provide a complete system for developing and running Android applications.
- What is the difference between a Service and an IntentService? Ans: A Service is a component that runs in the background and performs long-running operations, while an IntentService is a subclass of Service that automatically handles asynchronous requests on a worker thread. IntentService stops itself when it completes the task.
- What is a Content Provider in Android? Ans: A Content Provider is a component that allows different applications to share data with each other. It is used to manage access to a central repository of data, such as a database, and provides a standard interface for querying and modifying the data.
- What is a Broadcast Receiver in Android? Ans: A Broadcast Receiver is a component that receives and responds to broadcast messages sent by the Android system or other applications. It can be used to perform background tasks, such as updating the UI, sending notifications, or starting a Service.
- What is the difference between Serializable and Parcelable? Ans: Serializable is a standard Java interface used to serialize an object into a stream of bytes, while Parcelable is an Android-specific interface used to serialize and deserialize an object between processes. Parcelable is faster and more efficient than Serializable, but it is more complex to implement.
After those basic interview question. If you are going to attend an android developer experienced interview or for any experienced job. and you want to learn more about android advanced concepts than those are listed below. As Android Mobile Developer I’m giving you an advise to practice more on these advance concept will help you to qualify easily…
Advanced Android Developer Jobs Interview Questions with answers
- What is the difference between AsyncTask and RxJava? Ans: AsyncTask is an Android class used for performing background operations and updating the UI thread, while RxJava is a reactive programming library that enables asynchronous and event-driven programming. RxJava is more flexible and powerful than AsyncTask and can handle complex asynchronous operations with ease.
- What is Dependency Injection in Android? Ans: Dependency Injection is a design pattern used to simplify the process of creating objects and managing their dependencies. It allows objects to be created and configured at runtime, rather than at compile time, making the code more flexible and easier to test.
- What is Android Jetpack? Ans: Android Jetpack is a set of Android components and libraries that help developers build high-quality, robust, and maintainable Android apps. It provides a set of pre-built components that can be easily integrated into an app, such as Navigation, Lifecycle, ViewModel, and WorkManager.
- What is Data Binding in Android? Ans: Data Binding is a feature of Android Jetpack that allows developers to bind UI components in the XML layout to data sources in the app’s data model. This makes it easier to keep the UI and data in sync and reduces the amount of code needed to manage UI updates.
- What is Room in Android? Ans: Room is a database persistence library that is part of Android Jetpack. It provides an abstraction layer over SQLite, making it easier to manage database operations and reducing the amount of boilerplate code needed to manage database interactions.
- What is LiveData in Android? Ans: LiveData is an observable data holder class that is part of Android Jetpack. It is designed to keep the UI in sync with the data in the app’s data model and automatically updates the UI when the data changes.
- What is ViewModel in Android? Ans: ViewModel is an Android Jetpack component used to store and manage UI-related data. It is designed to survive configuration changes, such as screen rotations, and helps separate the UI logic from the business logic.
- What is Android NDK? Ans: Android NDK (Native Development Kit) is a toolset that allows developers to write native code in C/C++ and use it in an Android app. It is used to optimize performance-critical parts of the app, such as graphics and audio processing.
- What is ProGuard in Android? Ans: ProGuard is a tool used to optimize and obfuscate the code in an Android app. It reduces the size of the app and makes it more difficult for attackers to reverse engineer the code.
- What is Android Instant Apps? Ans: Android Instant Apps is a feature of Android that allows users to run an app without installing it on their device. It enables users to quickly try out an app and helps developers reach a wider audience by reducing the barrier to entry.
Hope! you learned a lot from this blog. You must know these answer Before going for the job interviews make sure to be well prepared! that’s why someone said “Practice makes man perfect” Keep learning & Enjoy your passion.
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