Accrete Globus Technology Android Developer Interview Questions and Answers

Q1. What are the different android components and concepts such as Recycler View, View Model, ANR and how do they function internally?
Ans. 
Android components like Recycler View, View Model, ANR are essential for building robust Android applications.
• Recycler View: Efficient way to display large data sets by recycling views as they scroll off the screen.

• View Model: Manages UI-related data in a lifecycle-conscious way, surviving configuration changes.

• ANR (Application Not Responding): Dialog shown to the user when the main thread of an app is blocked for too ...read more
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Q2. How will you debug and solve the following crash and ANR from the given stack trace?
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Q3. Solve this DSA question.
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Q1. Similar questions to the first round.
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Q1. Implement an LRU cache
Ans. 
LRU cache is a data structure that stores the most recently used items, discarding the least recently used items when full.
• Use a hashmap to store key-value pairs for quick access

• Use a doubly linked list to keep track of the order of items based on their usage

• When an item is accessed, move it to the front of the list

• When the cache is full, remove the least recently used item from the end of the list
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Q1. Write a program to check if string is a anagram
Ans. 
Program to check if a string is an anagram
• Create a function that takes in two strings as input

• Remove all spaces and convert both strings to lowercase

• Sort both strings and compare if they are equal to determine if they are anagrams
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Q2. What is react lifecycle method
Ans. 
React lifecycle methods are special methods that are automatically called by React at specific points in a component's life cycle.
• React components have several lifecycle methods such as componentDidMount, componentDidUpdate, componentWillUnmount, etc.

• These methods allow developers to perform actions at specific points in a component's life cycle, such as fetching data, updating the UI, or cleaning up resources.

• Understa...read more
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Create a web app to perform cred operation

General aptitude questions

Abstract topic group discussion

Q1. Technical interview covering topics on oops , data structures , conditional statements.
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Q1. General questions- introduction , how previous rounds went ,hobbies , what do you know about our company , situation based questions.
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Few questions that would involve problem solving. Basic 10th std math would suffice

Had few DSA questions.

Q1. Technical interview
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Q1. About job, expection etc
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Simple question on maths

Q1. Explain OOPS concept
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPS focuses on creating objects that interact with each other to solve complex problems

• Key principles include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation ensures that the internal state of an object is hidden from the outside world

• Inheritance allows a class to inherit...read more
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Q2. Coding array questions
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It was ok. I was not able to solve all the questions.

Q1. Remove the last element from a linkedlist
Ans. 
To remove the last element from a linked list, iterate to the second last node and update its next pointer to null.
• Iterate through the linked list to find the second last node

• Update the next pointer of the second last node to null
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Q2. Some basic questions on oops dbms and os
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Q1. Introduce yourself
Ans. 
I am a software developer with 5 years of experience in Java, Python, and SQL.
• 5 years of experience in Java, Python, and SQL

• Strong problem-solving skills

• Experience working in Agile development environment
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Q2. Short term goals
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Round duration - 60 minutes
Round difficulty - Easy

This was a DSA based round, I was asked to code on collabedit.

Q1. 
Rearrange Linked List Problem Statement
Given a singly linked list in the form 'L1' -> 'L2' -> 'L3' -> ... 'Ln', your task is to rearrange the nodes to the form 'L1' -> 'Ln' -> 'L2' -> '...read more
Ans. 
Rearrange the nodes of a singly linked list in a specific order without altering the data of the nodes.
• Use two pointers to split the linked list into two halves.

• Reverse the second half of the linked list.

• Merge the two halves alternately to rearrange the nodes.

• Ensure to handle cases with odd and even number of nodes separately.

• Example: For input 1 -> 2 -> 3 -> 4 -> 5, the output should be 1 -> 5 -> 2 -
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Q2. 
Find Missing Number In String Problem Statement
You have a sequence of consecutive nonnegative integers. By appending all integers end-to-end, you formed a string S without any separators. During this pro...read more
Ans. 
Given a string of consecutive nonnegative integers without separators, find the missing integer.
• Iterate through all possible splits of the string and check if the sequence is valid

• If the sequence is valid, return the missing integer

• Handle cases where there are multiple missing integers or the string is invalid
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Q3. 
Palindrome Permutation - Problem Statement
Determine if a permutation of a given string S can form a palindrome.
Example:
Input:
string S = "aab"
Output:
"True"
Explanation:
The permutation "aba" o...read more
Ans. 
Check if a permutation of a string can form a palindrome.
• Create a frequency map of characters in the string.

• Check if at most one character has an odd frequency.

• If yes, return True; otherwise, return False.
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Round duration - 30 minutes
Round difficulty - Medium

This was onsite interview round 1. Java and Android threading concepts are needed.

Q1. What is a Cyclic Barrier in Java?
Ans. 
CyclicBarrier in Java is a synchronization aid that allows a set of threads to wait for each other to reach a common barrier point.
• CyclicBarrier is initialized with a count of the number of threads that must invoke await() before the barrier is tripped.

• Threads wait at the barrier until all threads have invoked await(), then the barrier is released.

• Once the barrier is tripped, it can be reused for subsequent synchroniza...read more
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Q2. What are the different launch modes for activities in Android?
Ans. 
Different launch modes for activities in Android control how the activity is launched and how it interacts with the existing activities in the back stack.
• Standard: The default launch mode where a new instance of the activity is created every time it is launched.

• SingleTop: If the activity is already at the top of the back stack, it will not be recreated and onNewIntent() will be called instead.

• SingleTask: The activity w...read more
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Q3. How can you pass a simple Java object from one thread to another?
Ans. 
Use a Handler or AsyncTask to pass a Java object between threads.
• Use a Handler to send messages containing the object from one thread to another.

• Use AsyncTask to perform background tasks and update UI with the object on the main thread.
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Round duration - 60 minutes
Round difficulty - Easy

This round was all about android and internals of collections in Java.

Q1. What is an IntentService?
Ans. 
IntentService is a subclass of Service that can handle asynchronous requests on the main thread.
• IntentService is used for handling long-running operations in the background without blocking the main thread.

• It is started with an Intent and runs in a separate worker thread.

• Once the task is completed, the IntentService stops itself automatically.

• It is commonly used for tasks like downloading files, syncing data, or perfor
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Q2. What is the difference between deep links and app links?
Ans. 
Deep links are URLs that take users directly to specific content within an app, while app links are URLs that open an app if it's installed, or redirect to a website if not.
• Deep links are used to navigate users to a specific location within an app, bypassing the home screen.

• App links are URLs that can open an app if it's installed on the device, or redirect to a website if the app is not installed.

• Deep links require sp...read more
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Q3. What are the IPC mechanisms available in Android OS?
Ans. 
Inter-Process Communication (IPC) mechanisms in Android OS allow different processes to communicate with each other.
• Binder: High-performance mechanism for IPC between processes in Android. Used for communication between system services and applications.

• Intent: Used for communication between components within the same application or between different applications.

• Content Providers: Allow different applications to share ...read more
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Round duration - 90 minutes
Round difficulty - Medium

Technical interview round for purely checking the design knowledge of a person.

Q1. 
LRU Cache Design Question
Design a data structure for a Least Recently Used (LRU) cache that supports the following operations:
1. get(key) - Return the value of the key if it exists in the cache; otherw...read more
Ans. 
Design a Least Recently Used (LRU) cache data structure that supports get and put operations with capacity constraint.
• Implement a doubly linked list to keep track of the order of keys based on their recent usage.

• Use a hashmap to store key-value pairs for quick access and update.

• When capacity is reached, evict the least recently used item before inserting a new item.

• Update the order of keys in the linked list whenever a
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Q2. How would you design an ImageDownloader that efficiently handles parallel API calls?
Ans. 
Use a thread pool to handle parallel API calls efficiently.
• Implement a thread pool to manage multiple threads for downloading images concurrently.

• Use a caching mechanism to store downloaded images and avoid redundant API calls.

• Consider using a priority queue to prioritize important images for download.

• Implement a mechanism to cancel or pause ongoing downloads if needed.

• Optimize network requests by batching multiple req
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Round duration - 30 minutes
Round difficulty - Easy

This was the last Interview with director of engineering.