Photon Interactive Android Developer Interview Questions and Answers

Q1. Jetpack components, kotlin basics, java program, fragment life cycle Inner class
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Q1. More about project Challenge in project About git
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Q1. Explain MVVM architecture
Ans. 
MVVM is an architectural pattern that separates the UI, business logic, and data layers in an Android app.
• Model: Represents the data and business logic of the application.

• View: Represents the UI components of the application.

• ViewModel: Acts as a mediator between the Model and View, handling communication and logic.

• Data binding: MVVM uses data binding to synchronize the View and ViewModel.

• Example: In an Android app, the...read more
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Q2. Explain Java Basic concept
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Java is a high-level programming language known for its simplicity and versatility.
• Java is an object-oriented language

• It is platform-independent due to its 'write once, run anywhere' principle

• Java uses a virtual machine (JVM) to execute code

• It supports multithreading for concurrent programming

• Java has automatic memory management through garbage collection
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Q3. Explain Kotlin modifiers
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Kotlin modifiers are keywords used to modify classes, properties, functions, and other elements in Kotlin programming language.
• Kotlin modifiers include 'public', 'private', 'protected', 'internal', 'open', 'final', 'abstract', 'override', 'lateinit', 'const', 'companion', 'inline', 'data', 'sealed', 'inner', etc.

• Modifiers like 'public', 'private', 'protected', and 'internal' control the visibility of classes, functions...read more
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Q4. Explain RXJava networking library
Ans. 
RXJava is a popular Java library for composing asynchronous and event-based programs using observable sequences.
• RXJava provides a powerful way to handle asynchronous operations by using observables and subscribers.

• It simplifies complex asynchronous code by allowing developers to chain operations and handle errors more easily.

• RXJava is commonly used in Android development for handling network requests and background tas...read more
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Q5. Explain Git commit , merge and rebase command
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Git commit records changes to the repository, merge combines changes from different branches, and rebase moves changes to a new base commit.
• Git commit saves changes to the local repository with a message describing the changes made.

• Git merge combines changes from different branches into the current branch.

• Git rebase moves changes from one branch to another by applying each commit from the source branch to the target br
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Q1. Explain hooks in react
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Hooks are a new addition in React 16.8 that allow you to use state and other React features without writing a class.
• Hooks are functions that let you use state and other React features in functional components.

• useState() is a hook that allows you to add state to functional components.

• useEffect() is a hook that allows you to perform side effects in functional components.

• Custom hooks are reusable functions that can contai...read more
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Create weather application in react native with unit test scripts

Q1. Mostly in automotive android
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Q2. What is car propertymanager and mostly in to aosp
Ans. 
Car propertymanager is a component in AOSP that manages properties related to car-specific features.
• Car propertymanager is used to handle properties like car make, model, year, etc.

• It is mostly used in Android Automotive OS for managing car-specific settings and configurations.

• Developers can use car propertymanager to access and modify car-related properties in their apps.
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Q1. Software skills assessment
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Q1. More than technical it was soft skills assessment
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Q1. Questions related to basics of Kotlin
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Q2. Questions related to basics of Android
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Q1. Salary negotiation
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Q1. Oops based question
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Q2. Solid principles and how to implement
Ans. 
Solid principles are a set of five design principles for writing maintainable and scalable code.
• Single Responsibility Principle: A class should have only one reason to change.

• Open/Closed Principle: Classes should be open for extension but closed for modification.

• Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness.

• Interfa...read more
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Tata using network layer

Q1. Questions on MVVM, LiveData and Kotlin
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Q1. Andriod concets, Livedata, viewModal, Corotines, Kotlin & Java concepts
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Q1. 1. Why are you choosing this company? 2. If there is high package job & high knowledge job, which one you will choose? 3. Where do you see yourself in 5 years?
Ans. 
I am choosing this company because of its strong reputation, innovative projects, and great work culture.
• Strong reputation: The company has a proven track record of success and is highly regarded in the industry.

• Innovative projects: The company is known for its cutting-edge technology and exciting projects, which will provide me with opportunities to learn and grow.

• Great work culture: The company values its employees a...read more
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Q1. Jetpack components, kotlin basics, java program, fragment life cycle Inner class
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Q1. More about project Challenge in project About git
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