flutter_screenutil 4.0.0-beta

A flutter plugin for adapting screen and font size.Guaranteed to look good on different models

example/lib/main.dart

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        //Set the fit size (fill in the screen size of the device in the design) If the design is based on the size of the iPhone6 ​​(iPhone6 ​​750*1334)
        ScreenUtil.init(constraints, designSize: Size(750, 1334), allowFontScaling: false);

        return MaterialApp(
          debugShowCheckedModeBanner: false,
          title: 'Flutter_ScreenUtil',
          theme: ThemeData(
            primarySwatch: Colors.blue,
            textTheme: TextTheme(button: TextStyle(fontSize: 80.nsp)),
          ),
          home: HomePage(title: 'FlutterScreenUtil Demo'),
        );
      },
    );
  }
}

class HomePage extends StatefulWidget {
  const HomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    //Set the fit size (fill in the screen size of the device in the design) If the design is based on the size of the iPhone6 ​​(iPhone6 ​​750*1334)

    printScreenInformation();
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: SingleChildScrollView(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            Row(
              children: <Widget>[
                // Using Extensions
                Container(
                  padding: EdgeInsets.all(10.w),
                  width: 0.5.sw,
                  height: 200.h,
                  color: Colors.red,
                  child: Text(
                    'My width:${0.5.sw}dp \n'
                    'My height:${200.h}dp',
                    style: TextStyle(
                      color: Colors.white,
                      fontSize: 24.sp,
                    ),
                  ),
                ),
                // Without using Extensions
                Container(
                  padding: EdgeInsets.all(ScreenUtil().setWidth(10)),
                  width: ScreenUtil().screenWidth * 0.5,
                  height: ScreenUtil().setHeight(200),
                  color: Colors.blue,
                  child: Text(
                    'My width:${ScreenUtil().screenWidth * 0.5}dp \n'
                    'My height:${ScreenUtil().setHeight(200)}dp',
                    style: TextStyle(
                      color: Colors.white,
                      fontSize: ScreenUtil().setSp(24),
                    ),
                  ),
                ),
              ],
            ),
            Text('Device width:${ScreenUtil().screenWidthPx}px'),
            Text('Device height:${ScreenUtil().screenHeightPx}px'),
            Text('Device width:${ScreenUtil().screenWidth}dp'),
            Text('Device height:${ScreenUtil().screenHeight}dp'),
            Text('Device pixel density:${ScreenUtil().pixelRatio}'),
            Text('Bottom safe zone distance:${ScreenUtil().bottomBarHeight}dp'),
            Text('Status bar height:${ScreenUtil().statusBarHeight}dp'),
            Text(
              'Ratio of actual width dp to design draft px:${ScreenUtil().scaleWidth}',
              textAlign: TextAlign.center,
            ),
            Text(
              'Ratio of actual height dp to design draft px:${ScreenUtil().scaleHeight}',
              textAlign: TextAlign.center,
            ),
            SizedBox(
              height: 5.h,
            ),
            Text('System font scaling factor:${ScreenUtil().textScaleFactor}'),
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                Text(
                  'My font size is 24px on the design draft and will not change with the system.',
                  style: TextStyle(
                    color: Colors.black,
                    fontSize: 24.sp,
                  ),
                ),
                Text(
                  'My font size is 24px on the design draft and will change with the system.',
                  style: TextStyle(
                    color: Colors.black,
                    fontSize: 24.ssp,
                  ),
                ),
              ],
            )
          ],
        ),
      ),
    );
  }

  void printScreenInformation() {
    print('Device width dp:${1.sw}'); //Device width
    print('Device height dp:${1.sh}'); //Device height
    print('Device pixel density:${ScreenUtil().pixelRatio}'); //Device pixel density
    print(
        'Bottom safe zone distance dp:${ScreenUtil().bottomBarHeight}'); //Bottom safe zone distance，suitable for buttons with full screen
    print(
        'Status bar height px:${ScreenUtil().statusBarHeight}dp'); //Status bar height , Notch will be higher Unit px
    print('Ratio of actual width dp to UI Design:${ScreenUtil().scaleWidth}');
    print('Ratio of actual height dp to UI Design:${ScreenUtil().scaleHeight}');
    print('System font scaling:${ScreenUtil().textScaleFactor}');
    print('0.5 times the screen width:${0.5.sw}');
    print('0.5 times the screen height:${0.5.sh}');
  }
}