GridView.builder in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is GridView.builder used for in Flutter?

GridView.builder creates a scrollable grid of widgets that are built on demand. It is efficient for large or infinite lists because it only builds visible items.

beginner

Which parameter in GridView.builder controls the layout of the grid cells?

The gridDelegate parameter controls the layout. For example, SliverGridDelegateWithFixedCrossAxisCount sets a fixed number of columns.

beginner

Explain the role of the itemBuilder in GridView.builder.

itemBuilder is a function that creates each grid item widget. It is called only for items visible on screen, improving performance.

beginner

How do you specify the number of items in a GridView.builder?

Use the itemCount parameter to tell Flutter how many items to build in the grid.

intermediate

Why is GridView.builder preferred over GridView.count for large data sets?

Because GridView.builder builds widgets lazily only when needed, it uses less memory and improves scrolling performance for large or infinite lists.

What does the gridDelegate parameter in GridView.builder do?

A Specifies the total number of items

B Builds each grid item widget

C Defines the grid's layout like number of columns or spacing

D Handles user taps on grid items

gridDelegate controls the grid layout such as columns and spacing.

Which function parameter builds each item in GridView.builder?

A itemCount

B itemBuilder

C gridDelegate

D children

itemBuilder is the function that creates each grid item widget.

Why is GridView.builder more efficient for large lists?

A It builds only visible items on demand

B It builds all items at once

C It disables scrolling

D It uses fixed item sizes

It builds only the visible items, saving memory and improving performance.

How do you set the number of columns in a GridView.builder?

A Use <code>SliverGridDelegateWithFixedCrossAxisCount</code> in <code>gridDelegate</code>

B Set <code>itemBuilder</code>

C Set <code>itemCount</code>

D Use <code>children</code> list length

Use SliverGridDelegateWithFixedCrossAxisCount to specify columns.

What happens if you omit itemCount in GridView.builder?

A GridView uses default item count of 10

B GridView throws an error

C GridView builds zero items

D GridView builds infinite items

Without itemCount, the grid tries to build infinite items, which can cause issues.

Describe how to create a grid with 3 columns using GridView.builder in Flutter.

Think about how to set the grid layout and build each item.

Explain why GridView.builder is better for large data sets compared to GridView.count.

Consider how widgets are created and managed in memory.