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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

What if we want to change the layout of a Flutter widget depending on the size of its parent? We should use `LayoutBuilder`. Let’s look at an example:

Render a subtree of Flutter widgets with a layout that depends on the parent widget with the LayoutBuilder widget.

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 LayoutBuilder Widget