KPIT Technologies Senior Android Developer Interview Questions and Answers

Data structure - tree and linkedlist questions asked, binary search tree

Q1. Java multithreading
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Q2. Write code for synchronise threads
Ans. 
Synchronizing threads in Android can be achieved using synchronization blocks or methods.
• Use synchronized keyword to create a synchronized block or method

• Use locks such as ReentrantLock for more complex synchronization needs

• Consider using synchronized collections like ConcurrentHashMap for thread-safe data structures
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Write a program to print first and last letters of words alternatively from am list

Q1. Explain oops concept and it's pillars
Ans. 
OOPs stands for Object-Oriented Programming. It is based on four main pillars: Inheritance, Encapsulation, Abstraction, and Polymorphism.
• Inheritance: Allows a class to inherit properties and behavior from another class. Example: class B extends class A.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: using private access modifiers to restrict access to certain data.

• Abstract...read more
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Q2. Android architecture , thread v/s coroutine
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Q1. Explain the concept of multithreading and how is it differ from multiprocessing
Ans. 
Multithreading allows multiple threads to exist within the context of a single process, while multiprocessing involves multiple processes running concurrently.
• Multithreading allows multiple threads to share the same memory space and resources of a single process, while multiprocessing involves separate memory space for each process.

• Multithreading is more lightweight and efficient compared to multiprocessing as threads ...read more
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Q1. Mostly they focus on java , oops concept. Rather than Android related questions
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Q2. Prepare basics of oops well
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Data structure - tree and linkedlist questions asked, binary search tree

Q1. Java multithreading
Add your answer
Q2. Write code for synchronise threads
Ans. 
Synchronizing threads in Android can be achieved using synchronization blocks or methods.
• Use synchronized keyword to create a synchronized block or method

• Use locks such as ReentrantLock for more complex synchronization needs

• Consider using synchronized collections like ConcurrentHashMap for thread-safe data structures
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Q1. Reverse the items in the array with highest values skip the lowest
Ans. 
Reverse items in array with highest values, skipping the lowest
• Sort the array in descending order

• Skip the lowest value(s)

• Reverse the remaining items
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Q2. Kotlin coroutines
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Q3. Java interface and abstract class difference
Ans. 
Java interface defines a contract for classes to implement, while abstract class provides common functionality for subclasses.
• Interface can only have abstract methods, while abstract class can have both abstract and non-abstract methods.

• A class can implement multiple interfaces but can only extend one abstract class.

• Interfaces are used to achieve multiple inheritance in Java, while abstract classes are used to provide ...read more
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Q4. MVVM Pattern in android
Ans. 
MVVM is a design pattern used in Android development to separate the UI logic from the business logic.
• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View is the UI component that displays the data

• ViewModel acts as a mediator between the Model and View, handling the UI logic and data manipulation

• MVVM helps in maintaining a clean and organized codebase
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Q1. What is high order function?
Ans. 
A high order function is a function that can take other functions as parameters or return functions as results.
• High order functions can be used to create more flexible and reusable code.

• They allow for functions to be passed as arguments, making code more modular.

• Examples include map, filter, and reduce functions in functional programming.
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Q2. What is most efficient layout to use on android
Ans. 
ConstraintLayout is the most efficient layout to use on Android.
• Allows for flat view hierarchy

• Handles complex layouts efficiently

• Supports responsive design

• Provides tools for optimizing layouts
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