A Flutter package that make your UI responsive in a Minutes Just used this Package..

 

2.Responsive_framework

Flutter is an open-source mobile application development SDK created by Google. It is used to develop applications for Android, iOS, Windows, Mac, Linux, Google Fuchsia, and the web. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source. Flutter allows developers to create beautiful, fast, and high-performance apps that run on any platform. It includes a responsive framework, which makes it easy to create responsive apps that look great on any device. Responsive Framework adapts your UI to different screen sizes automatically. Create your UI once and have it display pixel-perfect on mobile, tablet, and desktop!

 

The Problem 

Supporting multiple display sizes often means recreating the same layout multiple times. Under the traditional Bootstrap approach, building responsive UI is time-consuming, frustrating, and repetitive. Furthermore, getting everything pixel-perfect is nearly impossible and simple edits take hours.

 

The Solution 

Use Responsive Framework to automatically scale your UI.

ResponsiveBreakpoint.autoScale(600);

Import this library into your project:

responsive_framework: ^latest_version

Add ResponsiveWrapper.builder to your MaterialApp or CupertinoApp.

 import 'package:responsive_framework/responsive_framework.dart';

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      builder: (context, child) => ResponsiveWrapper.builder(
          child,
          maxWidth: 1200,
          minWidth: 480,
          defaultScale: true,
          breakpoints: [
            ResponsiveBreakpoint.resize(480, name: MOBILE),
            ResponsiveBreakpoint.autoScale(800, name: TABLET),
            ResponsiveBreakpoint.resize(1000, name: DESKTOP),
          ],
          background: Container(color: Color(0xFFF5F5F5))),
      initialRoute: "/",
    );
  }
}

AutoScale shrinks and expands your layout proportionally, preserving the exact look of your UI. This eliminates the need to manually adapt layouts to mobile, tablet, and desktop.

ResponsiveBreakpoint.autoScale(600);

Flutter's default behavior is resized which Responsive Framework respects. AutoScale is off by default and can be enabled at breakpoints by setting autoScale to true.

Breakpoints 

Breakpoints control responsive behavior at different screen sizes.

ResponsiveWrapper(
    child,
    breakpoints: [
        ResponsiveBreakpoint.resize(600, name: MOBILE),
        ResponsiveBreakpoint.autoScale(800, name: TABLET),
        ResponsiveBreakpoint.autoScale(1200, name: DESKTOP),
    ],
)

Breakpoints give you fine-grained control over how your UI displays.

 

Introductory Concepts 

These concepts helps you start using the Responsive Framework and build an responsive app quickly.

Scale vs Resize 

Flutter's default behavior is to resize your layout when the screen dimensions change. Resizing a layout stretches it in the direction of an unconstrained width or height. Any constrained dimension stays fixed which is why mobile app UIs look tiny on desktop. The following example illustrates the difference between resizing and scaling.

 

An AppBar widget looks correct on a phone. When viewed on a desktop, however, the AppBar is too short and the title looks too small. Here is what happens under each behavior:

1. Resizing (default) - the AppBar's width is double. infinity so it stretches to fill the available width. The Toolbar height is fixed and stays 56dp.

2. Scaling - the AppBar's width stretches to fill the available width. The height scales proportionally using an aspect ratio automatically calculated from the nearest ResponsiveBreakpoint. As the width increases, the height increases proportionally.

When scaled, the AppBar looks correct on the desktop, up to a certain size. Once the screen becomes too wide, the AppBar starts to appear too large. This is where breakpoints come in.

Breakpoint Configuration 

To adapt to a wide variety of screen sizes, set breakpoints to control responsive behavior.

ResponsiveWrapper(
    child,
    maxWidth: 1200,
    minWidth: 480,
    defaultScale: true,
    breakpoints: [
        ResponsiveBreakpoint.resize(480, name: MOBILE),
        ResponsiveBreakpoint.autoScale(800, name: TABLET),
        ResponsiveBreakpoint.resize(1000, name: DESKTOP),
        ResponsiveBreakpoint.autoScale(2460, name: '4K'),
    ],
)

An arbitrary number of breakpoints can be set. Resizing/scaling behavior can be mixed and matched.

· below 480: resize on small screens to avoid cramp and overflow errors.

· 480-800: resize on phones for native widget sizes.

· 800-1000: scale on tablets to avoid elements appearing too small.

· 1000+: resize on desktops to use available space.

· 2460+: scale on extra large 4K displays so text is still legible and widgets are not spaced too far apart

Badges 🏆 

Now you can proudly display the time and headache saved by using Responsive Framework with a supporter's badge.

[![Flutter Responsive](https://img.shields.io/badge/flutter-responsive-brightgreen.svg?style=flat-square)](https://github.com/Codelessly/ResponsiveFramework)

<a href="https://github.com/Codelessly/ResponsiveFramework">
  <img alt="Built Responsive"
       src="https://raw.githubusercontent.com/Codelessly/ResponsiveFramework/master/packages/Built%20Responsive%20Badge.png"/>
</a>

<a href="https://github.com/Codelessly/ResponsiveFramework">
  <img alt="Built with Responsive Framework"
       src="https://raw.githubusercontent.com/Codelessly/ResponsiveFramework/master/packages/Built%20with%20Responsive%20Badge.png"/>
</a>