Globant Android Mobile Application Developer Interview Questions and Answers

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
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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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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. 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
Ans. 
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. Creating flow of api implementation using design patterns and unittesting
Ans. 
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
Ans. 
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. View Model Scope for activity or fragment
Ans. 
View Model Scope determines whether a ViewModel should be scoped to an activity or a fragment.
• View Model scoped to activity: shared between all fragments within the activity

• View Model scoped to fragment: specific to that fragment only

• Use activity scope for data shared across fragments, fragment scope for fragment-specific data
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Q1. 2nd largest element in array
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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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