CMS IT Services Android Developer Interview Questions and Answers

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. Oops , programming, collection, java basic and Kotlin basic
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Q1. What is static in Java?
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Q2. What is singleton?
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Q3. What is Coroutines?
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Q4. What is dispatcher?
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Q5. What is with context in Coroutines?
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Q6. How to raise request parallel in Coroutines?
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Q7. Scoped functions in Kotlin.
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Q8. Background task in Android.
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Q9. What is the difference between interface and abstract class in Java?
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Q10. What is let function?
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Q1. Types of job in kotlin coroutine
Ans. 
Types of jobs in Kotlin coroutine include launch, async, withContext, and runBlocking.
• launch: starts a new coroutine without blocking the current thread

• async: starts a new coroutine and returns a Deferred object with a result

• withContext: switches the coroutine context within a coroutine

• runBlocking: blocks the current thread until the coroutine inside it is completed
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Q2. What is Flow, Channel diffrent between StateFlow and SharedFlow
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Flow is a cold asynchronous data stream, Channel is a hot asynchronous data stream. StateFlow is a hot asynchronous data stream with a state, SharedFlow is a hot asynchronous data stream without a state.
• Flow is a cold asynchronous data stream that emits values one by one.

• Channel is a hot asynchronous data stream that can have multiple subscribers.

• StateFlow is a hot asynchronous data stream that retains the most recent ...read more
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Q3. If Flow lifecycle aware
Ans. 
Flow lifecycle aware means using Kotlin Flow with lifecycle awareness in Android development.
• Flow lifecycle aware helps manage data streams in Android apps

• It ensures that data emissions are only observed when the lifecycle is in the appropriate state

• Example: Using Flow with LiveData to update UI components based on lifecycle events
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Q4. What is inline function and highorder function?
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Inline functions are functions that are expanded in place at the call site, while high-order functions are functions that can take other functions as parameters or return them.
• Inline functions are expanded in place at the call site to improve performance.

• High-order functions can take other functions as parameters or return them.

• Example of high-order function: map() function in Kotlin.
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Q1. Basic interview question
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Q1. Basic interview questions
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Q1. Basic info of application development and upload process
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1. Unit testing
2. Program testing
3. Full integration testing

Q1. Salary dission and other Location and other Salary related discussion
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Q1. When we are use interface and abstract class in Android
Ans. 
Interfaces and abstract classes are used in Android to achieve abstraction, modularity, and code reusability.
• Interfaces are used to define a contract that classes must implement, allowing for polymorphism and loose coupling.

• Abstract classes provide a base implementation for subclasses, allowing for code reuse and providing common functionality.

• Interfaces are commonly used for event handling, callbacks, and defining con...read more
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