RedBus Interview Questions and Answers

To search for contacts with duplicate names and numbers, create a search function that checks both fields.

• Create a function that takes a search term as input

• Iterate through the list of contacts

• Check if the search term exists in the Name field or Num field

• Return the contacts that match the search term

Design a screen to show 10 nearest restaurants in a list while keeping the UI uninterrupted.

• Use a scrollable list view to display the restaurants

• Implement a location-based search algorithm to find the nearest restaurants

• Include a search bar to allow users to search for specific restaurants

• Display relevant information for each restaurant such as name, rating, and distance

• Implement filters or sorting options to allow users to customize the list

• Consider using a map view to show ...read more

Given an array of natural numbers, find the first missing natural number.

• Sort the array and iterate through it to find the first missing number.

• Use a hash set to keep track of the numbers present in the array.

• The first missing number will be the smallest positive integer not present in the array.

To transfer the Ball object from one thread to another in Android, we can use Handler or AsyncTask.

• Use Handler to post the Ball object from one thread to another

• Create a Handler in the receiving thread and use its post() method to receive the Ball object

• Alternatively, use AsyncTask to perform the transfer in the background thread and update the UI thread with the Ball object

A HashMap is a data structure that stores key-value pairs and provides constant time complexity for basic operations.

• Implement a hash function to convert keys into array indices

• Create an array to store the key-value pairs

• Handle collisions using a technique like chaining or open addressing

• Implement methods like put(), get(), and remove() to interact with the HashMap

A photo viewer app for Android devices.

• Use RecyclerView to display a grid of photos

• Implement a caching mechanism to improve performance

• Support gestures for zooming and swiping between photos

• Integrate with a cloud storage service for photo storage and retrieval

• Implement a search feature to allow users to find specific photos

Deep linking in Android allows linking to specific content within an app, enabling seamless navigation.

• Deep linking is achieved by defining intent filters in the app's manifest file.

• The intent filter specifies the data format and scheme for the deep link.

• Deep links can be triggered from other apps, websites, or even notifications.

• Handling deep links involves extracting data from the intent and navigating to the appropriate screen.

• Example:

Launch mode determines how a new instance of an activity is created and added to the task stack.

• Standard: Creates a new instance of the activity each time it is launched.

• SingleTop: If an instance of the activity already exists at the top of the stack, it will be reused.

• SingleTask: If an instance of the activity already exists in the stack, it will be brought to the front and cleared of any activities above it.

• SingleInstance: The activity will be launched in a new task and no ...read more