Flutter banner_view 轮播图的使用及实现代码

1、前言

实现轮播图，效果如下：

2、实现

将采用 banner_view 实现：资源库地址

2.1、yaml 引入依赖

在 pubspec.yaml 声明需要引用的库，执行命令 flutter packages get 进行拉取即可使用。

banner_view: "^1.1.2"

2.2、代码中引入依赖

在资源库地址下方，作者提供了 banner_view 的几种展示方式。

import 'package:flutter/material.dart';
import 'package:banner_view/banner_view.dart';
import 'Pair.dart';
import 'factory/BannerItemFactory.dart';
class BannerViewPage extends StatefulWidget {
@override
_BannerViewPageState createState() =  new _BannerViewPageState();
}
class _BannerViewPageState extends State<BannerViewPage  {
@override
Widget build(BuildContext context) {
return new Scaffold(
body:
new Container(
child: new Column(
children: <Widget [
new Container(
alignment: Alignment.center,
height: 200.0,
child: this._bannerView0(),
padding: EdgeInsets.only(bottom: 10.0),
)
],
),
),
);
}
/**
* 第一种方式
*/
BannerView _bannerView0() {
// 盛放图片的 List
List<Pair<String, Color   param = [
Pair.create('https://p5.ssl.qhimg.com/dm/456_209_/t01f43c5849ef5f521a.jpg', Colors.red[500]),
Pair.create('https://p.ssl.qhimg.com/t0171bb61911ebe8899.jpg', Colors.green[500]),
Pair.create('https://p.ssl.qhimg.com/t01ee77978d3a95a3ae.jpg', Colors.blue[500]),
];
return new BannerView(
BannerItemFactory.banners(param),
);
// return new BannerView(
//  BannerItemFactory.banners(param),
//  indicatorMargin: 10.0,
//  indicatorNormal: new Container(
//  width: 5.0,
//  height: 5.0,
//  decoration: new BoxDecoration(
//   color: Colors.green,
//   shape: BoxShape.rectangle,
//  ),
//  ),
//  indicatorSelected: new Container(
//  width: 15.0,
//  height: 5.0,
//  decoration: new BoxDecoration(
//   color: Colors.black,
//   shape: BoxShape.rectangle,
//   borderRadius: new BorderRadius.all(
//   new Radius.circular(5.0),
//   ),
//  ),
//  ),
//  indicatorBuilder: (context, indicator) {
//  Widget cc = new Container(
//   padding: new EdgeInsets.symmetric(horizontal: 20.0,),
//   height: 44.0,
//   width: double.infinity,
//   color: Colors.grey[300],
//   child: indicator,
//  );
//  return new Opacity(
//   opacity: 0.5,
//   child: cc,
//  );
//  },
// );
}
/**
* 第二种方式
*/
BannerView _bannerView() {
var pre = 'https://raw.githubusercontent.com/yangxiaoweihn/Assets/master';
List<Pair<String, Color   param = [
Pair.create('https://raw.githubusercontent.com/yangxiaoweihn/Assets/master/cars/car_0.jpg', Colors.red[100]),
Pair.create('https://raw.githubusercontent.com/yangxiaoweihn/Assets/master/cartoons/ct_0.jpg', Colors.green[100]),
Pair.create('https://raw.githubusercontent.com/yangxiaoweihn/Assets/master/pets/cat_1.jpg', Colors.blue[100]),
Pair.create('https://raw.githubusercontent.com/yangxiaoweihn/Assets/master/scenery/s_1.jpg', Colors.yellow[100]),
Pair.create('https://raw.githubusercontent.com/yangxiaoweihn/Assets/master/cartoons/ct_1.jpg', Colors.red[100]),
//  Pair.create('$pre/cartoons/ct_1.jpg', Colors.red[100]),
];
return new BannerView(
BannerItemFactory.banners(param),
indicatorMargin: 10.0,
indicatorNormal: new Container(
width: 5.0,
height: 5.0,
decoration: new BoxDecoration(
color: Colors.green,
shape: BoxShape.rectangle,
),
),
indicatorSelected: new Container(
width: 15.0,
height: 5.0,
decoration: new BoxDecoration(
color: Colors.black,
shape: BoxShape.rectangle,
borderRadius: new BorderRadius.all(
new Radius.circular(5.0),
),
),
),
indicatorBuilder: (context, indicator) {
Widget cc = new Container(
padding: new EdgeInsets.symmetric(horizontal: 20.0,),
height: 44.0,
width: double.infinity,
color: Colors.grey[300],
child: indicator,
);
return new Opacity(
opacity: 0.5,
child: cc,
);
},
);
}
}