NCR Voyix 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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Q1. Questions related to kotlin coroutines in depth questions, scenario based questions
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Q2. Solid principles
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Q3. Architecture patterns
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Q4. Kotlin coroutine
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Q5. Unit testing, espresso scenario based
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Q1. Desing pattern and ui testing
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Q2. Design pattern and coding
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Q3. Make api flow and create with help of design pattern for ui and ux testing
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The answer to the question is provided below.
• To create an API flow, start by identifying the endpoints and their functionalities.

• Design the UI and UX testing by using appropriate design patterns like MVC or MVVM.

• Implement the API calls and handle the responses using networking libraries like Alamofire.

• Use XCTest or UI Testing frameworks for automated UI and UX testing.

• Mock the API responses for testing purposes using t...read more
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Q1. They asked me about the frameworks and overall architecture in iOS, how to implement tables, create views and auto layout.
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Q1. Creating flow of api implementation using design patterns and unittesting
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The flow of API implementation can be designed using design patterns and unit testing.
• Identify the design patterns suitable for the API implementation

• Create a flow diagram to visualize the steps involved

• Implement the API using the chosen design patterns

• Write unit tests to ensure the functionality and reliability of the API

• Refactor and optimize the code as needed
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Q2. Creating the design pattern for api flow
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The design pattern for API flow involves defining the structure and sequence of API calls.
• Identify the required API endpoints and their parameters

• Determine the order and dependencies of API calls

• Handle error scenarios and implement error handling mechanisms

• Consider authentication and authorization requirements

• Implement data caching and request throttling if necessary
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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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Q1. 2nd largest element in array
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Find the 2nd largest element in an array of strings.
• Sort the array in descending order

• Access the element at index 1 to get the 2nd largest element
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Q2. Top view of given binary tree
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To get the top view of a binary tree, we need to find the nodes that are visible when looking at the tree from the top.
• Start from the root node and assign it a horizontal distance of 0.

• Traverse the tree using a queue and keep track of the horizontal distance of each node.

• For each horizontal distance, only keep the node with the smallest level in the result.

• Repeat the process for left and right child nodes, updating the
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Q1. Questions related to iOS and swift basics
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Q2. Design NotificationCenter
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NotificationCenter is a system that enables communication between different parts of an application.
• NotificationCenter allows components of an application to communicate without having direct references to each other.

• It uses the observer pattern where objects register themselves as observers for specific notifications.

• Notifications can be posted to the NotificationCenter with optional data.

• Observers can then receive an...read more
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Q1. Design twitter feed & solid principles
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Design a Twitter feed using SOLID principles
• Separate classes for each responsibility (Single Responsibility Principle)

• Use interfaces to define behavior and allow for easy swapping of implementations (Open/Closed Principle)

• Dependency Injection to decouple components and make testing easier (Dependency Inversion Principle)

• Liskov Substitution Principle to ensure derived classes can be substituted for their base classes wi...read more
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Q1. It was hiring manger rounds .. Behavioural questions
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Q2. First occurence of given number in sorted array
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Find the first occurrence of a given number in a sorted array.
• Use binary search to efficiently find the first occurrence of the number.

• Keep track of the index of the first occurrence as you search through the array.

• Return the index of the first occurrence once found.
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