text、container、image属性

text

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: '傻╮(╯▽╰)╭'),
    );
  }
}
class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  void _incrementCounter() {
    setState(() {
      _counter+=2;
    });
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              '假设生命倒计时是 $_counter 天 倒计时假装生命倒计时是 $_counter 天假装生命倒计时假装生命倒计时是  天假装生命倒时假装生命倒计时是3天假装生命倒计时',
              textAlign: TextAlign.center,//居中对齐 .left .right 对齐 还有start end
              maxLines: 2,//最大显示行数
              overflow: TextOverflow.ellipsis,//TextOverflow.ellipsis结尾多余部分显示3个点，fade 渐变消失（垂直）
              style: TextStyle(
                fontSize: 26.0,
                color: Color.fromARGB(200, 250, 120, 120),//第一个是透明度后3是rjb
                decoration: TextDecoration.underline,//下划线
                decorationStyle: TextDecorationStyle.solid,//实线
              ),
            ),
            Text(
              '$_counter 剩下',
              style: TextStyle(
                fontFamily: '微软雅黑',
                fontSize: 30.0,
                color: Color.fromARGB(255, 10, 200, 100)
              ),
            ),
            Text(
              '就乖乖学习',
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), 
    );
  }
}

container

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.yellow,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('hhh'),
        ),
        body: Center(
          child: Container(
            child: new Text('hi dwh', style: TextStyle(fontSize: 28.0,color: Colors.blue),),
            alignment: Alignment.topLeft,
            width: 300,
            height: 300,
            //color: Colors.black,
            padding: const EdgeInsets.fromLTRB(20, 30, 0, 0),//内边距 
            margin: const EdgeInsets.all(10),//外边距
            decoration: new BoxDecoration(
              gradient: const LinearGradient(//线性渐变
                colors: [Colors.lightGreenAccent,Colors.lightGreen,Colors.pink]
              ),
              border: Border.all(width: 2.0, color: Colors.blue,)//边框
            ),
          ),
        ),
      ),
    );
  }
}

引用外部Image

  home: Scaffold(
    appBar: AppBar(
      title: Text('hhhh'),
    ),
    body: Center(
      child: Container(
        child: Container(
          child: new Image.network(
            'https://img.isharebest.com/2018041509.jpg',
            fit: BoxFit.contain,
            //尽量充满，维持比例，fill全充满,
            //fitWidth 横向充满，纵向多余裁切
            //cover 图片不变形 四周裁切，scaleDown图片大小不变
            )
        ),
        width: 500.0,
        height: 350.0,
        color: Colors.yellow,
        padding: const EdgeInsets.all(10),
      ),
    ),
  ),

            child: Container(
              child: new Image.network(
                'https://img.isharebest.com/2018041509.jpg',
                fit: BoxFit.contain,
                color: Colors.lightGreen,
                colorBlendMode: BlendMode.darken,//颜色混合
                //colorBlendMode: BlendMode.colorBurn //增强对比度
                //colorBlendMode: BlendMode.colorDodge//提升曝光？
                )
            ),