Infinite scrolling in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is infinite scrolling in mobile apps?

Infinite scrolling is a technique where new content loads automatically as the user scrolls down, so they don’t have to tap to see more. It feels like the list never ends.

beginner

Which Flutter widget is commonly used to detect when the user scrolls near the end of a list?

The ScrollController is used to listen to scroll events and detect when the user reaches near the bottom to load more items.

beginner

Why should you show a loading indicator during infinite scrolling?

Showing a loading indicator tells users that new content is being fetched. It improves user experience by giving feedback that the app is working.

intermediate

What is a common way to avoid loading the same data multiple times in infinite scrolling?

Use a boolean flag like isLoading to prevent starting a new load while one is already in progress.

intermediate

How can you improve performance when implementing infinite scrolling in Flutter?

Use ListView.builder to build only visible items, and dispose of controllers properly to avoid memory leaks.

Which Flutter widget helps you build a scrollable list that loads items on demand?

A Container

B ListView.builder

C Text

D Row

ListView.builder creates list items only when needed, perfect for infinite scrolling.

What does the ScrollController do in infinite scrolling?

A Detects scroll position to trigger loading more data

B Displays images

C Manages network requests

D Controls the app theme

ScrollController listens to scroll events and helps detect when to load more content.

Why is it important to check if data is already loading before fetching more?

A To reset the scroll position

B To change the app color

C To avoid duplicate network calls and UI glitches

D To close the app

Checking prevents multiple loads at once, which can cause errors or slow the app.

What visual element helps users know new data is loading during infinite scroll?

A Loading spinner or progress bar

B Background color change

C Text size increase

D Button click

A loading spinner or progress bar shows the app is fetching more content.

Which method is best to build a list with many items efficiently in Flutter?

A Column

B GridView.count

C Stack

D ListView.builder

ListView.builder creates only visible items, saving memory and improving performance.

Explain how infinite scrolling works in a Flutter app and why it improves user experience.

Think about how apps like social media feeds load more posts as you scroll.

Describe the steps to implement infinite scrolling in Flutter using ListView.builder and ScrollController.

Focus on detecting scroll position and fetching new items.