DevRev Inc 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
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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
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Q1. Internally how work retrofit and which patter is follow
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Q2. Solid Priciple
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Q1. All technical Jetpack concept no DSA questions and asked all theoretical questions
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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
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Q1. What is Android Manifest
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Q2. What are services
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Q1. Basic technical knowledge question
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Q2. Android related questions
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Q1. Communication skill
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Q2. Salary regarding questions
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Q1. Basic data structure questions
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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.
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Q1. What is concurrency technique in android
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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
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Q1. Explain about previous project and what was your role in that project
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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
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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.
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Q1. DONT REMEMBER THE QUESTIONS
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Q2. I FORGOT THE QUESTION ASKED
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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.
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Coding test based on array