如何在抖动中添加图像轮播
我正在使用tag-imgPath将图像从Firebase实时数据库获取到应用程序。如何在全屏页面左右两端为图像提供轮播功能，以便用户可以转到下一张图像而无需返回到图像列表，而是在全屏模式下打开另一个图像。
The code-
class FullScreenImagePage extends StatelessWidget {
String imgPath;
FullScreenImagePage(this.imgPath);
final LinearGradient backgroundGradient = new LinearGradient(
colors: [new Color(0x10000000), new Color(0x30000000)],
begin: Alignment.topLeft,
end: Alignment.bottomRight);
@override
Widget build(BuildContext context) {
return Scaffold(
body: new SizedBox.expand(
child: new Container(
decoration: new BoxDecoration(gradient: backgroundGradient),
child: new Stack(
children: <Widget>[
new Align(
alignment: Alignment.center,
child: new Hero(
tag: imgPath,
child: new Image.network(imgPath),
),
),
],
),
),
),
);
}
2 个答案:
答案 0 :(得分：0)
如果我理解清楚，您正在尝试使用轮播显示图像
请使用此软件包https://pub.dev/packages/carousel_slider
完整的示例代码
import 'package:carousel_slider/carousel_slider.dart';
import 'package:flutter/material.dart';
final List<String> imgList = [
'https://images.unsplash.com/photo-1520342868574-5fa3804e551c?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=6ff92caffcdd63681a35134a6770ed3b&auto=format&fit=crop&w=1951&q=80',
'https://images.unsplash.com/photo-1522205408450-add114ad53fe?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=368f45b0888aeb0b7b08e3a1084d3ede&auto=format&fit=crop&w=1950&q=80',
'https://images.unsplash.com/photo-1519125323398-675f0ddb6308?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=94a1e718d89ca60a6337a6008341ca50&auto=format&fit=crop&w=1950&q=80',
'https://images.unsplash.com/photo-1523205771623-e0faa4d2813d?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=89719a0d55dd05e2deae4120227e6efc&auto=format&fit=crop&w=1953&q=80',
'https://images.unsplash.com/photo-1508704019882-f9cf40e475b4?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=8c6e5e3aba713b17aa1fe71ab4f0ae5b&auto=format&fit=crop&w=1352&q=80',
'https://images.unsplash.com/photo-1519985176271-adb1088fa94c?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=a0c8d632e977f94e5d312d9893258f59&auto=format&fit=crop&w=1355&q=80'
];
void main() => runApp(CarouselDemo());
final Widget placeholder = Container(color: Colors.grey);
final List child = map<Widget>(
imgList,
(index, i) {
return Container(
margin: EdgeInsets.all(5.0),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(5.0)),
child: Stack(children: <Widget>[
Image.network(i, fit: BoxFit.cover, width: 1000.0),
Positioned(
bottom: 0.0,
left: 0.0,
right: 0.0,
child: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [Color.fromARGB(200, 0, 0, 0), Color.fromARGB(0, 0, 0, 0)],
begin: Alignment.bottomCenter,
end: Alignment.topCenter,
),
),
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 20.0),
child: Text(
'No. $index image',
style: TextStyle(
color: Colors.white,
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
),
),
]),
),
);
},
).toList();
List<T> map<T>(List list, Function handler) {
List<T> result = [];
for (var i = 0; i < list.length; i++) {
result.add(handler(i, list[i]));
}
return result;
}
class CarouselWithIndicator extends StatefulWidget {
@override
_CarouselWithIndicatorState createState() => _CarouselWithIndicatorState();
}
class _CarouselWithIndicatorState extends State<CarouselWithIndicator> {
int _current = 0;
@override
Widget build(BuildContext context) {
return Column(children: [
CarouselSlider(
items: child,
autoPlay: true,
enlargeCenterPage: true,
aspectRatio: 2.0,
onPageChanged: (index) {
setState(() {
_current = index;
});
},
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: map<Widget>(
imgList,
(index, url) {
return Container(
width: 8.0,
height: 8.0,
margin: EdgeInsets.symmetric(vertical: 10.0, horizontal: 2.0),
decoration: BoxDecoration(
shape: BoxShape.circle,
color: _current == index
? Color.fromRGBO(0, 0, 0, 0.9)
: Color.fromRGBO(0, 0, 0, 0.4)),
);
},
),
),
]);
}
}
class CarouselDemo extends StatelessWidget {
@override
Widget build(BuildContext context) {
//Manually operated Carousel
final CarouselSlider manualCarouselDemo = CarouselSlider(
items: child,
autoPlay: false,
enlargeCenterPage: true,
viewportFraction: 0.9,
aspectRatio: 2.0,
);
//Auto playing carousel
final CarouselSlider autoPlayDemo = CarouselSlider(
viewportFraction: 0.9,
aspectRatio: 2.0,
autoPlay: true,
enlargeCenterPage: true,
items: imgList.map(
(url) {
return Container(
margin: EdgeInsets.all(5.0),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(5.0)),
child: Image.network(
url,
fit: BoxFit.cover,
width: 1000.0,
),
),
);
},
).toList(),
);
//Button controlled carousel
Widget buttonDemo() {
final basicSlider = CarouselSlider(
items: child,
autoPlay: false,
enlargeCenterPage: true,
viewportFraction: 0.9,
aspectRatio: 2.0,
);
return Column(children: [
basicSlider,
Row(children: [
Expanded(
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 15.0),
child: RaisedButton(
onPressed: () => basicSlider.previousPage(
duration: Duration(milliseconds: 300), curve: Curves.linear),
child: Text('prev slider'),
),
),
),
Expanded(
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 15.0),
child: RaisedButton(
onPressed: () => basicSlider.nextPage(
duration: Duration(milliseconds: 300), curve: Curves.linear),
child: Text('next slider'),
),
),
),
]),
]);
}
//Pages covers entire carousel
final CarouselSlider coverScreenExample = CarouselSlider(
viewportFraction: 1.0,
aspectRatio: 2.0,
autoPlay: false,
enlargeCenterPage: false,
items: map<Widget>(
imgList,
(index, i) {
return Container(
decoration: BoxDecoration(
image: DecorationImage(image: NetworkImage(i), fit: BoxFit.cover),
),
);
},
),
);
//User input pauses carousels automatic playback
final CarouselSlider touchDetectionDemo = CarouselSlider(
viewportFraction: 0.9,
aspectRatio: 2.0,
autoPlay: true,
enlargeCenterPage: true,
pauseAutoPlayOnTouch: Duration(seconds: 3),
items: imgList.map(
(url) {
return Container(
margin: EdgeInsets.all(5.0),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(5.0)),
child: Image.network(
url,
fit: BoxFit.cover,
width: 1000.0,
),
),
);
},
).toList(),
);
//Non-looping manual Carousel
final CarouselSlider nonLoopingCarousel = CarouselSlider(
items: child,
enableInfiniteScroll: false,
autoPlay: false,
enlargeCenterPage: true,
viewportFraction: 0.9,
aspectRatio: 2.0,
);
//Vertical carousel
final CarouselSlider verticalScrollCarousel = CarouselSlider(
scrollDirection: Axis.vertical,
aspectRatio: 2.0,
autoPlay: true,
enlargeCenterPage: true,
viewportFraction: 0.9,
pauseAutoPlayOnTouch: Duration(seconds: 3),
items: imgList.map(
(url) {
return Container(
margin: EdgeInsets.all(5.0),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(5.0)),
child: Image.network(
url,
fit: BoxFit.cover,
width: 1000.0,
),
),
);
},
).toList(),
);
//create full screen Carousel with context
CarouselSlider getFullScreenCarousel(BuildContext mediaContext) {
return CarouselSlider(
autoPlay: true,
viewportFraction: 1.0,
aspectRatio: MediaQuery.of(mediaContext).size.aspectRatio,
items: imgList.map(
(url) {
return Container(
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(0.0)),
child: Image.network(
url,
fit: BoxFit.cover,
width: 1000.0,
),
),
);
},
).toList(),
);
}
return MaterialApp(
title: 'demo',
home: Scaffold(
appBar: AppBar(title: Text('Carousel slider demo')),
body: ListView(
children: <Widget>[
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Manuell Carousel'),
manualCarouselDemo,
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Auto Playing Carousel'),
autoPlayDemo,
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Button Controlled Carousel'),
buttonDemo(),
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Full Screen Carousel'),
coverScreenExample,
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Carousel With Indecator'),
CarouselWithIndicator(),
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Pause When Touched Carousel'),
touchDetectionDemo,
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('No infinity scroll carousel'),
nonLoopingCarousel,
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Vertical scroll carousel'),
verticalScrollCarousel,
])),
Padding(
padding: EdgeInsets.only(top: 15.0),
//Builder needed to provide mediaQuery context from material app
child: Builder(builder: (context) {
return Column(children: [
Text('Full screen carousel'),
getFullScreenCarousel(context),
]);
})),
],
),
),
);
}
}
答案 1 :(得分：0)
我知道已经很晚了，但供以后参考
Carousel( dotSize: 3, dotColor: Colors.black, dotBgColor: Colors.transparent, autoplay: false, showIndicator: true, images: [
Image.network(widget.product_detail_picture,fit:BoxFit.fill,),
],)
上面说的是widget.product_detail_picture我已经在我的Firebase存储代码中初始化过的
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