屏幕快照 2019-02-14 下午6.23.44.png

代码

import 'package:flutter/material.dart'; 
void main() {
  runApp(MaterialApp(
    home: MyApp(),
  ));
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("搜索记录"),
      ),
      body: Wrap(
        spacing: 8.0,// 横向间距
        runSpacing: -2.0,//纵向间距
        children: <Widget>[
          Chip(
            avatar: new CircleAvatar(
                backgroundColor: Colors.blue,
                child: Text('M'),
            ),
            label: new Text('Mulligansadfsadgasd'),
          ),
          Chip(
            avatar: new CircleAvatar(
              backgroundColor: Colors.blue,
              child: Text('M'),
            ),
            label: new Text('Mulligansaadsgasdgdfsadgasd'),
          ),
          Chip(
            avatar: new CircleAvatar(
              backgroundColor: Colors.blue,
              child: Text('M'),
            ),
            label: new Text('Mdgasd'),
          ),
          Chip(
            avatar: new CircleAvatar(
              backgroundColor: Colors.blue,
              child: Text('M'),
            ),
            label: new Text('Mgasd'),
          ),
          Chip(
            avatar: new CircleAvatar(
              backgroundColor: Colors.blue,
              child: Text('M'),
            ),
            label: new Text('Mullfsadgasd'),
          )
        ],
      )
    );
  }
}

1. Wrap

spacing：横轴方向子widget的间距
alignment: 横轴对其方式
runSpacing：纵轴方向的间距
runAlignment：纵轴方向的对齐方式

Wrap({
    Key key,
    this.direction = Axis.horizontal,
    this.alignment = WrapAlignment.start,
    this.spacing = 0.0,
    this.runAlignment = WrapAlignment.start,

    this.runSpacing = 0.0,
    this.crossAxisAlignment = WrapCrossAlignment.start,
    this.textDirection,
    this.verticalDirection = VerticalDirection.down,
    List<Widget> children = const <Widget>[],
  }) : super(key: key, children: children);

2. Chip

Chip({
    Key key,
    this.avatar,//标签左侧Widget，一般为小图标
    @required this.label,//标签
    this.labelStyle,
    this.labelPadding,//padding
    this.deleteIcon//删除图标,
    this.onDeleted//删除回调，为空时不显示删除图标,
    this.deleteIconColor//删除图标的颜色,
    this.deleteButtonTooltipMessage//删除按钮的tip文字,
    this.shape//形状,
    this.clipBehavior = Clip.none,
    this.backgroundColor//背景颜色,
    this.padding,
    this.materialTapTargetSize//删除图标material点击区域大小,
  })

Flutter之CircleAvatar组件，圆形和圆角图片
Wrap
Chip