Gain insights into responsive and adaptive UI in Flutter, explore powerful widgets, external packages, and hands-on coding to build user-friendly, cross-platform applications.

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Flutter is an open-source software development kit (SDK) created by Google to support cross-platform application development for online and in the most popular consumer operating systems. Understanding Flutter’s user interface (UI) approach can help unlock robust application development across all these environments.

This course will introduce you to the core concepts of responsive and adaptive UI in Flutter. You’ll start with common layout widgets before exploring application development using the most powerful widgets. Next, you’ll explore external packages that can extend responsiveness and adaptiveness beyond the core Flutter UI. At each step, you’ll see examples comparing and contrasting responsive and adaptive UIs with applications that do not invoke these principles. Finally, you’ll build functional widgets and application UI with hands-on coding environments

By the end of this course, you’ll be able to build user-friendly applications in Flutter using responsive and adaptive UI principles.

Responsive and Adaptive UI in Flutter

To make our Flutter applications responsive, we can use `MediaQuery` and `LayoutBuilder` to define the pixel breakpoints for each device class—desktop, tablet, and smartphone. Another solution is to use an existing package that defines the most common breakpoints, such as `responsive_builder`.

The `responsive_builder` package provides widgets that require less code when we’re implementing responsive design in our applications.

## Size information with `ResponsiveBuilder`

One of the widgets provided by `responsive_builder` is `ResponsiveBuilder`, which has a `builder` function with a parameter of type
`SizingInformation`. A `SizingInformation` object contains the type of device, the size of the screen, and the local
widget size, combining both `MediaQuery` and `LayoutBuilder`.

To make our Flutter applications responsive, we can use `MediaQuery` and `LayoutBuilder` to define the pixel breakpoints for each device class—desktop, tablet, and smartphone. Another solution is to use an existing package that defines the most common breakpoints, such as `responsive_builder`.

The `responsive_builder` package provides widgets that require less code when we’re implementing responsive design in our applications.

# Size information with `ResponsiveBuilder`

One of the widgets provided by `responsive_builder` is `ResponsiveBuilder`, which has a `builder` function with a parameter of type
`SizingInformation`. A `SizingInformation` object contains the type of device, the size of the screen, and the local
widget size, combining both `MediaQuery` and `LayoutBuilder`.

Understand how to use device breakpoints while implementing responsive design with responsive_builder.

Introduction

Basic Single-Child Layout Widgets

Basic Multi-Child Layout Widgets

The Problem of Starting with a Smartphone

Measure your Sizes - Responsive UI Widgets

Different Widgets for Different Sizes

Avoid Gigantic Widgets

Adaptive Design

External Packages

Conclusion

Appendix: Other Resources

Get Device Breakpoints with responsive_builder