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Appy Pie IOS Developer Interview Questions and Answers
Appy Pie IOS Developer Interview Experiences
1 interview found
(1 Question)
- Q1. Related to objective C and Swift
(1 Question)
- Q1. Related to Swift and objective
Interview Preparation Tips
Interview questions from similar companies
React Native Developer Interview Questions & Answers
Talentica Software
Anonymous
posted on 30 Sep 2024
(3 Questions)
- Q1. Life Cycle Methods off class components
- Ans.
Life cycle methods are special methods in class components that allow developers to run code at specific points in the component's life cycle.
componentDidMount() is called after the component has been rendered to the DOM.
componentDidUpdate() is called after the component's state or props have been updated.
componentWillUnmount() is called before the component is removed from the DOM.
- Q2. Diffrence between FlatList and ScrollView
- Ans.
FlatList is optimized for rendering large lists efficiently by only rendering the items that are currently visible, while ScrollView renders all of its children at once.
FlatList is more performant for long lists as it only renders the items that are currently visible on the screen.
ScrollView renders all of its children at once, which can lead to performance issues with large datasets.
FlatList supports key extraction fo...
- Q3. Real World Scenories Questions
Skills evaluated in this interview
(3 Questions)
- 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 ...
- Q2. How will you debug and solve the following crash and ANR from the given stack trace?
- Q3. Solve this DSA question.
(1 Question)
- Q1. Similar questions to the first round.
(1 Question)
- 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
Skills evaluated in this interview
Senior IOS Developer Interview Questions & Answers
Talentica Software
Anonymous
posted on 21 Aug 2024
I applied via Approached by Company and was interviewed in Jul 2024. There was 1 interview round.
(3 Questions)
- Q1. Basic OOPs questions
- Q2. Questions on my project, what is the current project I am working on, my role in that
- Q3. Life cycle questions
I applied via Approached by Company and was interviewed in Sep 2023. There were 2 interview rounds.
(2 Questions)
- Q1. Android related questions
- Q2. One DSA question
(2 Questions)
- Q1. About previous projects
- Q2. About technology used in previous projects
Senior Android Application Developer Interview Questions & Answers
Affine
Anonymous
posted on 9 Mar 2024
I applied via Naukri.com and was interviewed in Sep 2023. There was 1 interview round.
(1 Question)
- Q1. Activity life cycle Factorial and fabbonacci series lateiniti var vs lazy Var vs val
- Ans.
Activity life cycle is a crucial concept in Android development. Factorial and Fibonacci series are common mathematical problems. lateinit var and lazy are used for initializing variables. Var and val are used for declaring variables.
Activity life cycle includes methods like onCreate, onStart, onResume, onPause, onStop, onDestroy.
Factorial is the product of all positive integers up to a given number. Example: 5! = 5*4*...
Interview Preparation Tips
Selected
I applied via Recruitment Consulltant and was interviewed before Aug 2023. There was 1 interview round.
There were total 3 rounds and it consists of Basic array and string coding question
Interview Preparation Tips
I was interviewed before Mar 2021.
(3 Questions)
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' -> '...
- 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
Swithout any separators. During this pro... - Q3.
Palindrome Permutation - Problem Statement
Determine if a permutation of a given string
Scan form a palindrome.Example:
Input:
string S = "aab"
Output:
"True"
Explanation:
The permutation "aba" o...
(3 Questions)
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?
- Q2. What are the different launch modes for activities in Android?
- Q3. How can you pass a simple Java object from one thread to another?
(3 Questions)
Round duration - 60 minutes
Round difficulty - Easy
This round was all about android and internals of collections in Java.
- Q1. What is an IntentService?
- Q2. What is the difference between deep links and app links?
- Q3. What are the IPC mechanisms available in Android OS?
(2 Questions)
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... - Q2. How would you design an ImageDownloader that efficiently handles parallel API calls?
Round duration - 30 minutes
Round difficulty - Easy
This was the last Interview with director of engineering.
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
I was interviewed in Feb 2017.
Interview Questionnaire
19 Questions
- Q1. Design an photo viewing app which will show images from the disk in the list, and one item in the list should take half of the screen. (Android app design question, have to explain all the components used ...
- Ans.
An Android photo viewing app with a list of images from disk, one taking half the screen.
Use RecyclerView to display the list of images
Use a custom adapter to bind the images to the RecyclerView
Use a GridLayoutManager with span count of 2 to achieve the half-screen effect
Load images from disk using a library like Glide or Picasso
Implement click listeners to handle item selection and display the selected image
- Q2. Print a linked list in a zig zag manner. -----/
- Q3. Given a String, write a function, which will return a boolean. The function will tell you whether one permutation of the string is Palindrome or not.
- Q4. Given an array, which consist of natural numbers only. The elements are in random order, tell the first missing natural number in the array. e.g 4,6,3,1,6,8 o.p - 2 1,2,3 O/P - 4
- Ans.
Given an array of natural numbers in random order, find the first missing natural number.
Sort the array in ascending order
Iterate through the sorted array and compare each element with its index
If the element is not equal to its index + 1, return the missing number
If all elements are in order, return the next natural number after the last element
- Q5. Java/Android : Given an Object 'Ball'. How will you transfer this ball object from one thread to another. Same ball object pass from Thread to MainThread.
- Ans.
To transfer the Ball object from one thread to another, we can use Handler or AsyncTask.
Use Handler to post a Runnable to the main thread's message queue
Use AsyncTask to perform background operations and update the UI on the main thread
Pass the Ball object as a parameter or use a shared variable between threads
- Q6. How does looper/handlers work internally when you pass object from one thread to another.
- Ans.
Looper/handlers allow passing objects between threads in Android.
Looper is a message loop that runs in a thread and processes messages from a message queue.
Handlers are used to send messages to the message queue of a looper.
When an object is passed from one thread to another using a handler, it is encapsulated in a message and added to the receiving thread's message queue.
The receiving thread's looper then processes th...
- Q7. Methods of IPC in android.
- Ans.
IPC (Inter-Process Communication) methods in Android allow communication between different processes.
Binder: Android's native IPC mechanism, used for communication between processes.
Intents: Used for communication between components within the same application or between different applications.
Content Providers: Allow sharing data between applications using a common interface.
Broadcasts: Used for asynchronous communica...
- Q8. Implement LRU cache. (Implement you own HashMap meanwhile) Main focus was around this question only.
- Q9. If you were asked to make your own HashMap, how will you do it. (As it was used in the first question)
- Ans.
To create my own HashMap, I would use an array of linked lists to handle collisions and implement key-value pairs using a hash function.
Create an array of linked lists to store the key-value pairs
Implement a hash function to generate an index for each key
Handle collisions by adding elements to the linked list at the corresponding index
Support operations like put(key, value), get(key), and remove(key)
- Q10. Some definitions and basic android questions. AsyncTask, IntentService, Service, internals of ArrayList, etc.
- Q11. Design a weather app. (One image for every weather is there on a server) Take care of half downloaded image, try not to consume data of user again.
- Ans.
A weather app that displays images for different weather conditions, taking care of half downloaded images and minimizing data consumption.
Implement image caching to store downloaded images locally
Check if the image is already downloaded before making a network request
Use a progress bar to indicate the download status of the image
Handle cases where the download is interrupted or incomplete
Implement a mechanism to resum...
- Q12. Extended same question for the adapter with multiple images. Do not unncessary download if user has scrolled fast. - How will you cancel the request when the user has scrolled, and what will you do when ...
- Q13. You have application which shows list of all contacts, the Name/Numbers can be duplicated. How will you go on and do searching in this. Search term can either exist in Name or in Number.
- Ans.
To search for contacts with duplicate names or numbers, iterate through the list and compare each contact's name and number with the search term.
Iterate through the list of contacts
Compare the search term with each contact's name and number
Return the contacts that match the search term
- Q14. Question based on Java cyclic barrier.
- Q15. Launch Mode of Activity.
- Ans.
Launch mode determines how an activity is launched and how it behaves in the task stack.
Standard: Creates a new instance of the activity on each launch.
SingleTop: Reuses the existing instance if it's already at the top of the stack.
SingleTask: Creates a new task and places the activity at the root of the task.
SingleInstance: Creates a new task and places the activity as the only one in the task.
- Q16. How do you do DeepLinking in android.
- Ans.
Deep linking in Android allows users to navigate directly to specific content within an app.
Deep linking is achieved by defining intent filters in the app's manifest file.
The intent filter specifies the URL scheme and host that the app can handle.
When a deep link is clicked, Android checks if any app can handle the URL and prompts the user to choose.
The chosen app receives the deep link data in the intent's data field.
...
- Q17. Some Project based questions, What were your challenges, which projecct you loved most, which one you did not etc......
- Q18. You have to design screen in which at a time on screen 10 nearest restaurants will be shown in a list. The screen will keep adding more options while scrolling. Scroll in the list should be uninterrupted...
- Ans.
Design a screen to show 10 nearest restaurants in a list with uninterrupted scrolling.
Use a RecyclerView to display the list of restaurants
Implement a custom adapter to populate the data in the list
Use a location service to get the user's current location
Sort the restaurants based on their distance from the user's location
Load more restaurants as the user scrolls to the end of the list
- Q19. Design the ImageDownloader, with efficiently handling parallel API calls.
- Ans.
ImageDownloader efficiently handles parallel API calls.
Use a thread pool to manage parallel API calls.
Implement caching to avoid redundant API calls.
Use a priority queue to prioritize image downloads.
Optimize network requests by using HTTP/2 or multiplexing.
Consider using a library like Picasso or Glide for image loading and caching.
Interview Preparation Tips
Experience: Skype round, coding on collabedit (1 Hour)
Round: Technical Interview
Experience: On Site interview 1 and half hour round.
Tips: Java and Android threading concepts are needed.
Round: Technical Interview
Experience: This round was all about android and internals of collections in Java.
OnSite 1 hour round.
Round: Technical Interview
Experience: Purely for checking the design knowledge of a person. (1.5 hour round)
Round: Technical Interview
Experience: Interview with director of engineering.
Skills: Android Development, Java Programming, Data Structures And Algorithms
Skills evaluated in this interview
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Appy Pie IOS Developer Interview Process
based on 1 interview
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