三、Container容器组件2Padding内边距属性的使用margin外边距属性的使用decoration属性制作彩

Padding内边距属性的使用

EdgeInsets.all();统一设置
EdgeInsets.formLTRB(value1,value2,value3,value4)

margin外边距属性的使用
decoration属性制作彩色背景

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: "TextWidget",
        home: Scaffold(
          appBar: AppBar(
            title: Text("TextWidget"),
          ),
          body: Center(
            child: Container(
              child: Text(
                "hello cookie",
                style: TextStyle(
                  fontSize: 14.0,
                ),
              ),
              alignment: Alignment.center,
              width: 500.0,
              height: 400.0,
              //color: Colors.amberAccent,
              //padding: const EdgeInsets.all(10.0),
              decoration: BoxDecoration(
                  gradient: const LinearGradient(
                      colors: [
                        Colors.lightBlue,
                        Colors.greenAccent,
                        Colors.purple,
                      ]
                  )
              ) ,
              margin: const EdgeInsets.all(10.0),
            ),
          ),
        ));
  }
}