Flutter Sizer

Flutter Sizer helps implement a responsive layout by providing helper widgets and extensions

Responsive Image

Responsive Image

Content

Installation

Add flutter_sizer to pubspec.yaml

dependencies:
  flutter_sizer: ^1.0.4

Parameters

  • Adaptive.h() - Returns a calculated height based on the device
  • Adaptive.w() - Returns a calculated width based on the device
  • Adaptive.sp() - Returns a calculated sp based on the device (deprecated)
  • Adaptive.dp() - Returns a calculated dp based on the device
  • .h - Returns a calculated height based on the device
  • .w - Returns a calculated width based on the device
  • .sp - Returns a calculated sp based on the device (deprecated)
  • .dp - Returns a calculated dp based on the device
  • Device.boxConstraints - Returns the Device's BoxConstraints
  • Device.orientation - Returns the Screen Orientation (portrait or landscape)
  • Device.screenType - Returns the Screen Type (mobile or tablet)
  • Device.devicePixelRatio - Returns the devicePixel Ratio or (1.0)

Usage

Import the Package

import 'package:flutter_sizer/flutter_sizer.dart';

Wrap MaterialApp with FlutterSizer widget

 FlutterSizer(
      builder: (context, orientation, screenType) {
        return MaterialApp();
      }
 )

Widget Size

Container(
  width: Adaptive.w(20),    // This will take 20% of the screen's width
  height: 30.5.h     // This will take 30.5% of the screen's height
)

Font size

Text(
  'Flutter Sizer', 
  style: TextStyle(fontSize: 15.dp),
)

Orientation

If you want to support both portrait and landscape orientations

Device.orientation == Orientation.portrait
  ? Container(   // Widget for Portrait
      width: 100.w,
      height: 20.5.h,
   )
  : Container(   // Widget for Landscape
      width: 100.w,
      height: 12.5.h,
   )

DeviceType

If you want the same layout to look different in tablet and mobile, use the Device.screenType method:

Device.screenType == ScreenType.tablet
  ? Container(   // Widget for Tablet
      width: 100.w,
      height: 20.5.h,
   )
  : Container(   // Widget for Mobile
      width: 100.w,
      height: 12.5.h,
   )

Take Note

You need to import flutter_sizer package in order to access number.h, number.w, and number.dp

Auto import in VSCode and Android Studio doesn't work for dart extension methods. Typing 10.h would not bring up auto import suggestion for this package

One workaround is to type Device so that the auto import suggestion would show up:

import 'package:flutter_sizer/flutter_sizer.dart';

Community Support

If you have any suggestions or issues, feel free to open an issue

If you would like to contribute, feel free to create a PR

Libraries

flutter_sizer