Dyson Senior Android Developer Interview Questions and Answers

It was DSA questions

Q1. What is Android Framework?
Ans. 
Android Framework is a set of APIs and tools provided by Android to develop applications for Android devices.
• It provides a set of pre-built components for building mobile applications.

• It includes libraries for UI design, data storage, networking, and more.

• Developers can use Android Framework to create apps for smartphones, tablets, wearables, and other devices.

• Examples of Android Framework components include Activities...read more
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Q2. What do you know about MVVM ?
Ans. 
MVVM stands for Model-View-ViewModel, an architectural pattern used in software development.
• MVVM separates the user interface from the business logic and data access layers.

• Model represents the data and business logic, View represents the UI, and ViewModel acts as a mediator between the two.

• ViewModel exposes data and commands to the View, and communicates with the Model to retrieve and save data.

• MVVM is commonly used i...read more
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Q3. Explain Room Persistence Library.
Ans. 
Room is an abstraction layer over SQLite to allow for more robust database access while harnessing the full power of SQLite.
• Room is a part of Android Architecture Components.

• It provides compile-time verification of SQL queries.

• It simplifies database operations by eliminating boilerplate code.

• It supports LiveData and RxJava for reactive programming.

• It allows for easy migration of database schema.

• It provides a clean API ...read more
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Q4. Write a Builder class.
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A Builder class is used to create objects with a large number of optional parameters.
• Builder class is a creational design pattern.

• It separates the construction of a complex object from its representation.

• It allows you to create different variations of an object while avoiding constructor pollution.

• It has a fluent interface that allows you to chain method calls together.

• Example: StringBuilder in Java.
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Q5. Kotlin - letinit, val, var, extension function, data class.
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Q6. Explain - Coroutin, RxJava
Ans. 
Coroutines and RxJava are both used for asynchronous programming in Android development.
• Coroutines are a lightweight solution for asynchronous programming that allow for easy cancellation and error handling.

• RxJava is a reactive programming library that uses Observables and Observers to handle asynchronous events.

• Both Coroutines and RxJava can be used to simplify complex asynchronous code and improve app performance.

• Cor...read more
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Q7. What are SOLID principles in OOP languages?
Ans. 
SOLID principles are a set of five design principles that help in creating maintainable and scalable software applications.
• S - Single Responsibility Principle (SRP)

• O - Open-Closed Principle (OCP)

• L - Liskov Substitution Principle (LSP)

• I - Interface Segregation Principle (ISP)

• D - Dependency Inversion Principle (DIP)
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Q1. What are kotlin scope functions?
Ans. 
Kotlin scope functions are functions that allow concise code block execution on an object.
• Kotlin scope functions include let, run, with, apply, and also.

• They are used to simplify code and avoid repetitive variable references.

• For example, 'with' can be used to execute multiple operations on an object without repeating its name.

• Similarly, 'apply' can be used to initialize an object's properties without repeating its name...read more
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Q1. Basic and some coding questions Write singleton Classes with example
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Q2. Some algorithms like palindrome number solve
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Q1. Go through Swift. Ord doc and keep the concept clear and should be sufficient enough to crack the interview. Prepare some string based coding problems. Also can ask you about implementing protocols and sim...read more
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