去掉DeBug图标

在我们进行编写代码预览时，有一Debug的图标一直在屏幕上，确实不太美观，其实只要语句代码就可以去掉的

  • debugShowCheckedModeBanner: false,
  1. import 'package:flutter/material.dart';
  3. void main() => runApp(MyApp());
  5. class MyApp extends StatelessWidget {
  6.   @override
  7.   Widget build(BuildContext context) {
  8.     return MaterialApp(
  9.         title: 'Flutter Demo',
  10.         //去掉DeBug图标
  11.         debugShowCheckedModeBanner: false,
  12.         theme: ThemeData(
  13.           primarySwatch: Colors.blue,
  14.         ),
  15.         home: Scaffold());
  16.   }
  17. }

打电话

  1. import 'package:url_launcher/url_launcher.dart';
  3. void _launchPhone(String? phone) async {
  4.     var url = "tel:${phone ?? ''}";
  5.     if (await canLaunch(url)) {
  6.       await launch(url);
  7.     } else {
  8.       throw 'Could not launch $url';
  9.     }
  10. }

屏幕宽度和高度

  1. MediaQuery.of(context).size.width
  2. MediaQuery.of(context).size.height
  1. ///初始化 ScreenUtil 屏幕适配
  2. void initScreen(context) {
  3.   ScreenUtil.init(
  4.       BoxConstraints(
  5.           maxWidth: MediaQuery.of(context).size.width,
  6.           maxHeight: MediaQuery.of(context).size.height),
  7.       designSize: Size(375, 812),
  8.       orientation: Orientation.portrait);
  9. }