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选择Dart 语言 然后添加

pkey 构造函数

const 类名({Key? key}) : super(key: key);

plesswidget

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

class TestLessWidget extends StatelessWidget {
  const TestLessWidget({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: const Text("测试"),
      ),
      body: Container(
        color: Color.fromRGBO(Random().nextInt(256), Random().nextInt(256), Random().nextInt(256), 1),
      ),
    );
  }
}

pfulwidget

import 'package:flutter/material.dart';
import 'dart:math';
class TestFulWidget extends StatefulWidget {
  const TestFulWidget({Key? key}) : super(key: key);
  @override
  State<StatefulWidget> createState() => TestFulState();
}
class TestFulState extends State<TestFulWidget> {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: const Text("测试"),
      ),
      body: Container(
        color: Color.fromRGBO(Random().nextInt(256), Random().nextInt(256), Random().nextInt(256), 1),
      ),
    );
  }
}

pranomcolor

Color.fromRGBO(Random().nextInt(256), Random().nextInt(256), Random().nextInt(256), 1)

papp

import 'dart:math';

import 'package:flutter/material.dart';
import 'package:learn/_00_Utils/log.dart';

main () {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "你好",
      home: Scaffold(
        appBar: AppBar(title: const Text("测试用例"),),
        body: Container(color: Color.fromRGBO(Random().nextInt(256), Random().nextInt(256), Random().nextInt(256), 1),),
      ),
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      debugShowCheckedModeBanner: false,
    );
  }
}