WinWire Android App Developer Interview Questions and Answers

Q1. Agile, data class, how to initialize a class in activity?, dagger, difference between bind and provides annotation, unit test using mockito and junit
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Q1. Explain activity life cycle
Ans. 
Activity life cycle refers to the stages an activity goes through from creation to destruction.
• An activity is created using onCreate() method

• It becomes visible using onStart() method

• It becomes interactive using onResume() method

• It goes to background using onPause() method

• It becomes invisible using onStop() method

• It gets destroyed using onDestroy() method
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Q2. What is difference between abstract class and interface
Ans. 
Abstract class is a class that can have both abstract and non-abstract methods while interface only has abstract methods.
• Abstract class can have constructors while interface cannot

• A class can implement multiple interfaces but can only inherit from one abstract class

• Abstract class can have instance variables while interface cannot

• Abstract class can provide default implementation for some methods while interface cannot

• Ex...read more
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Q1. Why are you looking for a change?
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Q2. Tell me about yourself.
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Q1. Scope functions in kotlin
Ans. 
Scope functions in Kotlin are functions that allow you to execute a block of code within the context of an object.
• There are five scope functions in Kotlin: let, run, with, apply, and also.

• Each scope function has a specific use case and can help improve code readability and reduce boilerplate code.

• Scope functions can be used to perform operations on an object and return a result or modify the object itself.

• For example, ...read more
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Q2. LazyRow vs RecyclerView
Ans. 
LazyRow is a Jetpack Compose component for displaying horizontally scrolling lists, while RecyclerView is a traditional Android view for displaying large data sets efficiently.
• LazyRow is part of Jetpack Compose, RecyclerView is part of the Android framework

• LazyRow is more declarative and easier to use for simple lists, RecyclerView is more powerful and customizable for complex lists

• LazyRow automatically handles recycli...read more
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Round duration - 60 minutes
Round difficulty - Easy

This was an easy round which went really smooth.

Q1. 
Nth Fibonacci Number Problem Statement
Calculate the Nth term in the Fibonacci sequence, where the sequence is defined as follows: F(n) = F(n-1) + F(n-2), with initial conditions F(1) = F(2) = 1.
Input:
...read more
Ans. 
Calculate the Nth Fibonacci number efficiently using dynamic programming.
• Use dynamic programming to store previously calculated Fibonacci numbers to avoid redundant calculations.

• Start with base cases F(1) and F(2) as 1, then iteratively calculate F(n) using F(n-1) and F(n-2).

• Ensure the input N is within the constraints 1 <= N <= 10000.

• Example: For N = 5, the 5th Fibonacci number is 5 (1, 1, 2, 3, 5).
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Q2. 
Prime Numbers Problem Statement
Given a positive integer N, your task is to determine and return all prime numbers less than or equal to N.
Input:
N = 10
Output:
2 3 5 7
Example:
Input:
N = 20
Out...read more
Ans. 
Implement a function to return all prime numbers less than or equal to a given positive integer N.
• Create a function that takes a positive integer N as input

• Iterate from 2 to N and check if each number is prime

• Use a helper function to determine if a number is prime

• Return an array of all prime numbers less than or equal to N
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Q3. What is a merge join in SQL?
Ans. 
A merge join in SQL is a method of combining two sorted datasets by matching corresponding rows based on a specified condition.
• Merge join is used when joining two large datasets that are already sorted.

• It is more efficient than other join methods like nested loop join or hash join for sorted datasets.

• The join condition must be an equality condition.

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.i
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Round duration - 30 minutes
Round difficulty - Easy

The round went excellent. I really enjoyed it. Just be confident about whatever you answer