Delve into Flutter's UI framework to build high-quality Android apps, from creating contact profiles to enhancing them with themes and API integration, culminating in app publication.

Flutter is Google’s mobile UI framework used for crafting high-quality native interfaces on iOS and Android. This course focuses on building applications for the Android platform.

You’ll start by exploring the intricacies of Flutter and work your way up to implementing a contact profile page for an Android address book.

In the latter half of the course, you’ll learn to work with Flutter themes to spruce up the contact profile app you created. To round out your Flutter experience, you’ll also practice fetching data from a remote Application Programming Interface (API).

You’ll put into practice what you learn using live coding environments embedded within the course. By the time you’re done, you’ll be ready to create your own Android app and publish it to the Google Play Store.

Salahaddin Mohammed

I completed the course "Beginning Flutter: Android Mobile App Development" at the Educative platform. I have easily understood the course because of your great explanation. I want to thank you really!

Thank you letter from a student.

Beginning Flutter: Android Mobile App Development

# Introduction

In this lesson, we'll make use of the `Stateful` widget to toggle "Hello Flutter !" text from English to Spanish and vice versa.

We chose the [`Stateful`](https://api.flutter.dev/flutter/widgets/StatefulWidget-class.html) widget because we need to update the currently displayed text. 

In the Hello Flutter app, clicking on the 'refresh' `IconButton` in appBar will trigger updating the text. The interface rebuild is triggered by the `setState` method provided by the `Stateful` widget.



# Creating `Stateful` widget

First, `HelloFlutterApp` needs to extend `Stateful` widget:

```
class HelloFlutterApp extends StatefulWidget {
  @override
  _HelloFlutterAppState createState() => _HelloFlutterAppState();
}

class _HelloFlutterAppState extends State<HelloFlutterApp> {

  @override
  Widget build(BuildContext context) {
    return Container();
  }
}
```

In this lesson, we cover how to implement a Stateful widget in detail.

Introduction

Hello Flutter !

Build your Contact Profile Page

Flutter Themes

MovieApp: Fetching Data from REST API

Where to Go from Here

Appendix: Installation & Setting up Flutter (Optional)

Stateful Widget In Action

Introduction

Creating `Stateful` widget

Stateful Widget In Action

Introduction

Creating Stateful widget

Creating `Stateful` widget