main_zh.dart

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

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter_ScreenUtil',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(title: 'FlutterScreenUtil Demo'),
    );
  }
}

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

  final String title;

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    //设置适配尺寸 (填入设计稿中设备的屏幕尺寸) 假如设计稿是按iPhone6的尺寸设计的(iPhone6 750*1334)
    ScreenUtil.instance = ScreenUtil(width: 750, height: 1334)..init(context);
    print('设备宽度:${ScreenUtil.screenWidth}'); //Device width
    print('设备高度:${ScreenUtil.screenHeight}'); //Device height
    print('设备的像素密度:${ScreenUtil.pixelRatio}'); //Device pixel density
    print(
        '底部安全区距离:${ScreenUtil.bottomBarHeight}'); //Bottom safe zone distance，suitable for buttons with full screen
    print(
        '状态栏高度:${ScreenUtil.statusBarHeight}px'); //Status bar height , Notch will be higher Unit px
    print(
        '字体和宽度相对设计稿放大的比例:${ScreenUtil().scaleWidth}'); //The width is enlarged relative to the design draft
    print(
        '高度相对于设计稿放大的比例:${ScreenUtil().scaleHeight}'); //The height is enlarged relative to the design draft
    print('系统的字体缩放比例:${ScreenUtil.textScaleFactory}');

    return new Scaffold(
      appBar: new AppBar(
        title: new Text(widget.title),
      ),
      body: new Center(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            Row(
              children: <Widget>[
                Container(
                  width: ScreenUtil().setWidth(375),
                  height: ScreenUtil().setHeight(200),
                  color: Colors.red,
                  child: Text(
                    '我的宽度:${ScreenUtil().setWidth(375)}dp',
                    style: TextStyle(
                        color: Colors.white,
                        fontSize: ScreenUtil().setSp(28, false)),
                  ),
                ),
                Container(
                  width: ScreenUtil().setWidth(375),
                  height: ScreenUtil().setHeight(200),
                  color: Colors.blue,
                  child: Text('我的宽度:${ScreenUtil().setWidth(375)}dp',
                      style: TextStyle(
                          color: Colors.white,
                          fontSize: ScreenUtil().setSp(28, false))),
                ),
              ],
            ),
            Text('设备宽度：${ScreenUtil.screenWidth}px'),
            Text('设备高度:${ScreenUtil.screenHeight}px'),
            Text('设备的像素密度:${ScreenUtil.pixelRatio}'),
            Text('底部安全区距离:${ScreenUtil.bottomBarHeight}px'),
            Text('状态栏高度:${ScreenUtil.statusBarHeight}px'),
            Text(
              '宽度相对于设计稿放大的倍数:${ScreenUtil().scaleWidth}',
              textAlign: TextAlign.center,
            ),
            Text(
              '高度相对于设计稿放大的倍数:${ScreenUtil().scaleHeight}',
              textAlign: TextAlign.center,
            ),
            SizedBox(
              height: ScreenUtil().setHeight(200),
            ),
            Text('系统的字体缩放比例:${ScreenUtil.textScaleFactory}'),
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                Text('我的文字大小是28px，不会随着系统的文字大小变化',
                    style: TextStyle(
                        color: Colors.black,
                        fontSize: ScreenUtil().setSp(28, false))),
                Text('我的文字大小是28px，会随着系统的文字大小变化',
                    style: TextStyle(
                        color: Colors.black, fontSize: ScreenUtil().setSp(28))),
              ],
            )
          ],
        ),
      ),
    );
  }
}