Flutter: Set gradient background color for entire screen

Last updated on February 17, 2022 A Goodman Loading... Post a comment

In this article, you will see an example of how to create a fullscreen gradient background for a Flutter application.

Summary

In order to set a gradient background for the entire screen, just follow these steps:

  1. Wrap the Scaffold widget with a Container
  2. Set Scaffold’s backgroundColor to Colors.transparent
  3. Set a gradient background for the wrapper Container using BoxDecoration.

Example

Screenshots:

No AppBar
With AppBar

The code (no AppBar):

// main.dart
import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      // Remove the debug banner
      debugShowCheckedModeBanner: false,
      title: 'Kindacode.com',
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: const BoxDecoration(
          gradient: LinearGradient(
              begin: Alignment.topLeft,
              end: Alignment.bottomRight,
              colors: [Colors.purple, Colors.orange])),
      child: Scaffold(
          // By defaut, Scaffold background is white
          // Set its value to transparent
          backgroundColor: Colors.transparent,
          body: Center(
            child: Container(
              width: 200,
              height: 200,
              color: Colors.white,
            ),
          )),
    );
  }
}

The code (with AppBar):

// main.dart
import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      // Remove the debug banner
      debugShowCheckedModeBanner: false,
      title: 'Kindacode.com',
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: const BoxDecoration(
          gradient: LinearGradient(
              begin: Alignment.topLeft,
              end: Alignment.bottomRight,
              colors: [Colors.purple, Colors.orange])),
      child: Scaffold(
          // By defaut, Scaffold background is white
          // Set its value to transparent
          backgroundColor: Colors.transparent,
          appBar: AppBar(
            backgroundColor: Colors.black45,
            title: const Text('Kindacode.com'),
          ),
          body: Center(
            child: Container(
              width: 200,
              height: 200,
              color: Colors.white,
            ),
          )),
    );
  }
}

Conclusion

In this article, you explored an example of how to set gradient background color for the whole screen in a Flutter app. If you’d like to learn more exciting stuff in Flutter and Dart, take a look at the following articles:

You can also check out our Flutter category page or Dart category page for the latest tutorials and examples.

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