import 'package:flutter/material.dart';

void main() => runApp(new MaterialApp(
    title: "Hello Container",
    color:Colors.white,
    home: new Container(
      child: new Text("Hello Container",style: TextStyle(
        fontSize: 12,
        decoration: TextDecoration.none
      ),),
      alignment: Alignment.bottomRight,
      height: 500,
      width: 500,
      padding: const EdgeInsets.fromLTRB(0, 0, 10, 50),
      margin: const EdgeInsets.fromLTRB(50, 50, 50, 50),
      decoration: new BoxDecoration(
        color: Colors.purple,
        gradient: new SweepGradient(
            colors: [Colors.purple, Colors.blue, Colors.yellow]),
      ),
    )));

import 'package:flutter/material.dart';

void main() => runApp(new MaterialApp(
      title: "text Demo",
      home: MyTextWidget(),
    ));

class MyTextWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Container(
      child: new Column(
        children: <Widget>[
          new Row(
            children: <Widget>[
              new Container(
                width: 100,
                height: 100,
                color: Colors.blue[500],
                padding: const EdgeInsets.symmetric(vertical: 10,horizontal: 10),
                child: new Text(
                  "style1",
                  style: TextStyle(
                    fontWeight: FontWeight.bold,
                    color: Colors.purpleAccent,
                    fontSize: 12,
                    decoration: TextDecoration.none
                  ),
                ),
              ),
              new Expanded(
                  child: new Text(
                "style2 很长很长的文本……………………，style2 很长很长的文本……………………，style2 很长很长的文本……………………",
                overflow: TextOverflow.ellipsis,
                textAlign: TextAlign.center,
                    style: TextStyle( decoration: TextDecoration.none,letterSpacing: 10,fontSize: 14),
              ))
            ],
          ),
          new Text.rich(TextSpan(
            text: "text rich",
            style: TextStyle(decoration: TextDecoration.lineThrough),
            children: <TextSpan>[
              TextSpan(text: "文本",style: TextStyle(fontStyle: FontStyle.italic,backgroundColor: Colors.red,decoration: TextDecoration.none)),
              TextSpan(text: "文本",style: TextStyle(fontWeight: FontWeight.bold,color: Colors.red,decoration: TextDecoration.overline,decorationStyle: TextDecorationStyle.dashed))
            ]
          ))
        ],
      ),
    );
  }
}

flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
    - images/timg.jpg

import 'package:flutter/material.dart';

void main() => runApp(new MaterialApp(
      title: "Image",
      home: new Column(
        children: <Widget>[
          new AppBar(
            title: new Text("Image"),
          ),
          new Row(
            children: <Widget>[
              new Container(
                child: Image.asset('images/timg.jpg'),
                height: 100,
                width: 100,
              ),
              new Container(
                child: Image.network(
                    "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1554051453686&di=49ba8655fcf533e41bde7a00267c80c1&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201810%2F17%2F20181017150055_rvngs.thumb.700_0.jpg"),
                height: 100,
              ),
            ],
          ),
          new Row(
            children: <Widget>[
              new Container(
                child: Image.network(
                  "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1554051453686&di=49ba8655fcf533e41bde7a00267c80c1&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201810%2F17%2F20181017150055_rvngs.thumb.700_0.jpg",
                  scale: 2,
                ),
                height: 200,
                width: 200,
                color: Colors.lightBlue,
              ),
              new Container(
                child: Image.network(
                  "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1554051453686&di=49ba8655fcf533e41bde7a00267c80c1&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201810%2F17%2F20181017150055_rvngs.thumb.700_0.jpg",
                  fit: BoxFit.contain,
                ),
                height: 100,
                width: 100,
                color: Colors.yellow,
              )
            ],
          ),
          new Row(
            children: <Widget>[
              new Container(
                child: Image.network(
                  "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1554051453686&di=49ba8655fcf533e41bde7a00267c80c1&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201810%2F17%2F20181017150055_rvngs.thumb.700_0.jpg",
                  fit: BoxFit.fill,
                ),
                height: 100,
                width: 100,
                color: Colors.red,
              ),
              new Container(
                child: Image.network(
                  "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1554051453686&di=49ba8655fcf533e41bde7a00267c80c1&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201810%2F17%2F20181017150055_rvngs.thumb.700_0.jpg",
                  fit: BoxFit.contain, //1.保持图片的宽高比
                  // 2.将图片放置到ImagetView的中心，然后进行向外按比例放大或者缩小，直到一个方向已经适应，
                  // 3、类似FIT_CENTER
                ),
                height: 100,
                width: 100,
                color: Colors.purple,
                margin: const EdgeInsets.all(10),
              ),
              new Container(
                child: Image.network(
                  "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1554051453686&di=49ba8655fcf533e41bde7a00267c80c1&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201810%2F17%2F20181017150055_rvngs.thumb.700_0.jpg",
                  fit: BoxFit.cover, //保持原比例不被拉伸但是可能会被裁切  类似centercrop
                ),
                height: 100,
                width: 100,
                color: Colors.purple,
                margin: const EdgeInsets.all(10),
              ),
            ],
          ),
          //混合模式
          new Row(
            children: <Widget>[
              new Container(
                child:  Image.asset('images/timg.jpg',
                  color: Colors.purple,
                  colorBlendMode: BlendMode.darken,
                ),
                height: 100,
                width: 100,
              ),
              new Container(
                  child:  Image.asset('images/timg.jpg',
                    color: Colors.purple,
                    colorBlendMode: BlendMode.colorBurn,
                  ),
                  height: 100,
                  width: 100,
                  padding: const EdgeInsets.all(10),
                  margin: const EdgeInsets.all(10),
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.all(Radius.circular(15)),
                      border: Border.all(color: Colors.yellow, width: 3))),
              new Container(
                  child:  Image.asset('images/timg.jpg',
                    repeat: ImageRepeat.repeat,
                  ),
                  height: 100,
                  width: 100,
              )
            ],

          )
        ],
      ),
    ));