ListView basics in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a ListView in Flutter?

A ListView is a scrollable list of widgets arranged linearly. It allows users to scroll through a list of items vertically or horizontally.

beginner

How do you create a simple vertical ListView with fixed children?

Use ListView(children: [Widget1, Widget2, ...]) to create a scrollable list with a fixed set of widgets.

intermediate

What is the difference between ListView and ListView.builder?

ListView takes a fixed list of children, while ListView.builder creates children on demand, which is efficient for long or infinite lists.

intermediate

Why should you use ListView.builder for large lists?

Because it builds only the visible items plus a few extra, saving memory and improving performance compared to building all items at once.

beginner

How can you make a ListView scroll horizontally?

Set the scrollDirection property to Axis.horizontal in the ListView constructor.

Which widget creates a scrollable list that builds its children lazily?

A ListView.builder

B ListView

C Column

D Row

ListView.builder builds children on demand, which is efficient for long lists.

How do you make a ListView scroll horizontally?

A Use <code>ListView.vertical()</code>

B Wrap it in a <code>Row</code>

C Set <code>scrollDirection: Axis.horizontal</code>

D Set <code>direction: horizontal</code>

The scrollDirection property controls the scroll axis.

What happens if you use ListView with many children without builder?

A All children are built at once, which may cause performance issues

B Children are built lazily

C The list scrolls horizontally by default

D The list will not scroll

ListView with fixed children builds all widgets immediately.

Which property do you use to provide the list of widgets in a simple ListView?

A widgets

B children

C elements

D items

The children property takes a list of widgets.

What is the default scroll direction of a ListView?

A None

B Horizontal

C Diagonal

D Vertical

By default, ListView scrolls vertically.

Explain how to create a scrollable vertical list of text items in Flutter using ListView.

Think about how you put multiple widgets inside a scrollable container.

Describe the benefits of using ListView.builder over a simple ListView with many children.

Consider what happens when you have a very long list.