Wonderslate Technologies Android Developer Interview Questions and Answers

Q1. What is MVVM design how it's work
Ans. 
MVVM is a design pattern that separates the UI, business logic, and data layers in an Android app.
• 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 user interactions and updating the UI.

• Data binding is often used to connect the ViewModel with the View in MVVM.

• Example: In an A...read more
Answered by AI
Add your answer
Q2. What is a Content Provider
Ans. 
A Content Provider is a component in Android that manages access to a structured set of data.
• Content Providers are used to share data between different applications.

• They provide a standard interface for connecting data in one process with code running in another process.

• Content Providers can be used to store and retrieve data from a SQLite database, a file, or even the web.

• Examples of Content Providers include Contacts
Answered by AI
Add your answer

Q1. Internally how work retrofit and which patter is follow
Add your answer
Q2. Solid Priciple
Add your answer

Q1. All technical Jetpack concept no DSA questions and asked all theoretical questions
Add your answer
Q2. What are coroutine, how to secure ur app data, network call in android , ssl pinning, notification's implementation through FCM, android basic questions
Ans. 
Coroutines are a way to perform asynchronous operations in Android, securing app data involves encryption, SSL pinning enhances security, FCM for notifications.
• Coroutines are used for managing asynchronous operations in Android, allowing for efficient and non-blocking code execution.

• Securing app data involves using encryption techniques such as AES to protect sensitive information from unauthorized access.

• SSL pinning i...read more
Answered by AI
Add your answer

Q1. What is Android Manifest
Add your answer
Q2. What are services
Add your answer

Q1. Basic technical knowledge question
Add your answer
Q2. Android related questions
Add your answer

Q1. Communication skill
Add your answer
Q2. Salary regarding questions
Add your answer

Q1. Basic data structure questions
Add your answer
Q2. Explain binary search with example
Ans. 
Binary search is a search algorithm that finds the position of a target value within a sorted array.
• Divide the array into two halves and compare the target value with the middle element.

• If the target value is less than the middle element, search the left half. If greater, search the right half.

• Repeat the process until the target value is found or the subarray is empty.
Answered by AI
Add your answer

Q1. What is concurrency technique in android
Ans. 
Concurrency technique in Android allows multiple tasks to run simultaneously, improving performance and responsiveness.
• Concurrency in Android can be achieved using AsyncTask, Handlers, Executors, and RxJava.

• AsyncTask allows running background tasks on a separate thread and updating UI on the main thread.

• Handlers are used to post and process Runnable objects on a thread's message queue.

• Executors provide a high-level API...read more
Answered by AI
Add your answer

Q1. Explain about previous project and what was your role in that project
Add your answer

Q1. How to check if a number is palindrome?
Ans. 
To check if a number is palindrome, reverse the number and compare it with the original number.
• Convert the number to a string to easily reverse it

• Reverse the string and compare it with the original string

• If they are the same, the number is a palindrome
Answered by AI
Add your answer
Q2. How to find smallest number in a list?
Ans. 
To find the smallest number in a list, iterate through the list and keep track of the smallest number found so far.
• Iterate through the list and compare each number with the current smallest number.

• If a number is smaller than the current smallest number, update the smallest number.

• Return the smallest number found after iterating through the entire list.
Answered by AI
Add your answer

Q1. DONT REMEMBER THE QUESTIONS
Add your answer
Q2. I FORGOT THE QUESTION ASKED
Add your answer

Q1. Sort array in 0(n) time complexity
Ans. 
Use counting sort algorithm to achieve O(n) time complexity.
• Count the frequency of each string in the array.

• Create a new array based on the frequency counts.

• Iterate through the new array to reconstruct the sorted array.
Answered by AI
Add your answer

Coding test based on array