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

If we want to find information about the device our application is running on, we can use `MediaQuery`. The `MediaQuery` widget provides information to the subtree starting from its child. We need to provide a `MediaQuery` widget to the widget tree of our application, but widgets like `MaterialApp`, `WidgetsApp`, and `CupertinoApp` do that for us. Usually, we don’t need to do anything more than ask the `MediaQuery` for the information that we need.

Actually, the `MediaQuery` widget does not provide the information directly, but it holds a `MediaQueryData` widget that has the data. We can request what we need by obtaining an object of type `MediaQueryData` with `MediaQuery.of(context)`. Next, we accessing the properties provided by this object.

For instance, if we want to know the device’s screen width, we can call `MediaQuery.of(context).size.width`. Let’s try it in the example below:

Learn about the device running the application using MediaQuery.

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 MediaQuery Widget