flutter: 定义常量

一，代码：

1,文件:

conf/constants.dart

import 'package:flutter/material.dart';
// 定义全局常量
const String globalApiKey = '你的api密钥:1234567';
const Color defaultBackgroundColor = Colors.white;
const double defaultFontSize = 16.0;

2,调用

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:getxdemo1/conf/constants.dart';

class SmallPage extends StatelessWidget {
  const SmallPage({super.key});
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Text("api:"+globalApiKey),
            

 

二，测试效果: