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

The Flutter framework does a good job of sizing and placing our widgets. However, sometimes we need to change the widget’s size because the framework calculation doesn’t fit our needs. Let’s take look at an example:

Both images represent the same Flutter application running on two different devices—a smartphone in portrait mode on the left, and a tablet in landscape mode on the right. The text fits the screen on the smartphone because the available width is limited. On the other hand, there is so much available width on the tablet version that the text becomes unreadable.

## Constrain the width

Each widget in Flutter has a minimum and maximum width and height. These are called the **constraints**. When it’s time to design the UI’s layout, these values are derived from its parent widget and use to calculates its size.

Sometimes we want to change the width and height of a widget regardless of the constraints given by the parent. In this case, we can use the `ConstrainedBox` widget to override the constraints provided by the parent widget.

For instance, in the example above, we can limit the width available for the text to make it more readable.

# Constrain the width

Each widget in Flutter has a minimum and maximum width and height. These are called the **constraints**. When it’s time to design the UI’s layout, these values are derived from its parent widget and use to calculates its size.

Sometimes we want to change the width and height of a widget regardless of the constraints given by the parent. In this case, we can use the `ConstrainedBox` widget to override the constraints provided by the parent widget.

For instance, in the example above, we can limit the width available for the text to make it more readable.

Limit the size of a widget by setting width and height restrictions.

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

The ConstrainedBox Widget

Constrain the width