Practo Senior Android Developer Interview Questions and Answers

Q1. Asked me to develop an android app with weather forecast (use dependency injection)
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Q2. Develop weather forecast app
Ans. 
Develop a weather forecast app for Android platform.
• Utilize APIs like OpenWeatherMap for real-time weather data

• Include features like current weather, hourly forecast, and 7-day forecast

• Implement location-based weather updates

• Design user-friendly interface with intuitive navigation

• Incorporate push notifications for weather alerts
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The first round consisted of a coding exercise along with fundamental questions related to React Native, JavaScript, and inquiries about objects and arrays.

Q1. Native modules, useRef, Flatlist
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Q1. Lazy vs latinit
Ans. 
lazy vs lateinit are both used in Kotlin to delay the initialization of variables, but lazy is for val properties and lateinit is for var properties.
• lazy is a property delegate that initializes the value only upon first access

• lateinit is used for var properties that are guaranteed to be initialized before accessing them

• lazy can be used for properties that are computationally expensive to initialize, while lateinit is u...read more
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Q2. Hashmap vs hashtable
Ans. 
Hashtable is synchronized and slower, while hashmap is not synchronized and faster.
• Hashtable is synchronized, while hashmap is not.

• Hashtable does not allow null keys or values, while hashmap allows one null key and multiple null values.

• Hashtable is thread-safe, while hashmap is not.

• Hashtable is slower than hashmap due to synchronization.

• Example: Hashtable ht = new Hashtable(); HashMap hm = new HashMap();
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Find distinct island, check if balanced parenthesis

Q1. Activities lifestyle
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Q2. Compose kotlin
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Q1. What is the maximum bundle size?
Ans. 
The maximum bundle size for Android apps is 150 MB.
• The maximum bundle size for Android App Bundles is 150 MB.

• This includes the size of the base module and all dynamic feature modules.

• If the app exceeds this size, it may not be able to be installed on devices with limited storage.
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Q2. Lifecycle of views
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Views in Android have a lifecycle that includes creation, starting, pausing, resuming, stopping, and destroying.
• Views are created when the layout is inflated or added programmatically.

• Views start when they become visible on the screen.

• Views pause when they lose focus but are still visible.

• Views resume when they regain focus.

• Views stop when they are no longer visible on the screen.

• Views are destroyed when the activity i...read more
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The first round is Hackerrank two algo and one UI test very easy, Second is Fundamentals of JS and React Native one must have a deep understanding of JS to do that I strongly suggest going through Akashay Saini's JS series It'll help and the Third is PS/DS asked some basic A&DS questions can be solved easily with little practice on Leetcode

Q1. Javascript basics
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Q1. React native basics
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Q2. Scroll vs flatlist
Ans. 
FlatList is more efficient for rendering large lists with better performance compared to ScrollView.
• FlatList is optimized for rendering long lists by only rendering 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 lists.

• FlatList also provides built-in support for pull-to-refresh, infinite scrolling, and item separators.

• Scr...read more
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Q3. Design carousel in react native
Ans. 
Designing a carousel in React Native involves creating a horizontal scroll view with swipe functionality.
• Use ScrollView component with horizontal prop to create the carousel layout.

• Render multiple items inside the ScrollView to display carousel content.

• Implement swipe gestures to navigate between carousel items.

• Consider using libraries like 'react-native-snap-carousel' for additional features and customization.
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