图像本身加载，但不作为随机列表加载。 -颤振
问题描述 投票：0回答：1
并先谢谢您的协助。
因此，当我在代码的其他区域的容器中使用图像时，可以正确加载图像，但是我也希望其中一些图像在AppBar中随机显示。
鉴于它们确实在代码内的其他位置加载，因此我不怀疑Pubyaml错误。
我对扑扑还是相当陌生，并且列出了一般情况。因此，如果我弄混了列表本身或其调用方式，我不会感到惊讶。
它给我这个错误：
Syncing files to device iPhone...
Reloaded 8 of 502 libraries in 411ms.
════════ Exception caught by image resource service ════════════════════════════════════════════════
The following assertion was thrown resolving an image codec:
Unable to load asset: Image(image: AssetImage(bundle: null, name: "images/Mem2.JPG"), frameBuilder: null, loadingBuilder: null, alignment: center, this.excludeFromSemantics: false, filterQuality: low)
When the exception was thrown, this was the stack:
#0 PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:221:7)
<asynchronous suspension>
#1 AssetBundleImageProvider._loadAsync (package:flutter/src/painting/image_provider.dart:484:44)
#2 AssetBundleImageProvider.load (package:flutter/src/painting/image_provider.dart:469:14)
#3 ImageProvider.resolve.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:flutter/src/painting/image_provider.dart:327:17)
...
Image provider: AssetImage(bundle: null, name: "Image(image: AssetImage(bundle: null, name: "images/Mem2.JPG"), frameBuilder: null, loadingBuilder: null, alignment: center, this.excludeFromSemantics: false, filterQuality: low)")
Image key: AssetBundleImageKey(bundle: PlatformAssetBundle#c99db(), name: "Image(image: AssetImage(bundle: null, name: "images/Mem2.JPG"), frameBuilder: null, loadingBuilder: null, alignment: center, this.excludeFromSemantics: false, filterQuality: low)", scale: 1.0)
════════════════════════════════════════════════════════════════════════════════════════════════════
这里是代码：
class ContactProfilePage extends StatefulWidget {
@override
_ContactProfilePageState createState() => _ContactProfilePageState();
}
class _ContactProfilePageState extends State<ContactProfilePage> {
List<Attr> attr = [
Attr(name: ''),
];
dynamic randAppBarImg = [
"images/Mem2.JPG",
"images/Mem3.JPG",
"images/Mem4.JPG",
"images/Mem6.jpg",
"images/memory - 1.jpeg",
"images/memory - 2.jpeg",
"images/memory - 3.jpeg",
"images/memory - 4.jpeg",
"images/memory - 5.jpeg",
"images/memory - 6.jpeg",
];
Random rnd;
Image img() {
int min = 0;
int max = randAppBarImg.length - 1;
rnd = Random();
int r = min + rnd.nextInt(max - min);
String image_name = randAppBarImg[r].toString();
return Image.asset(image_name);
}
@override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(
backgroundColor: Colors.lightBlueAccent,
child: Icon(Icons.add),
onPressed: () {
//Modal sheet brings up the whole bottom pane when the plus button is pressed.
showModalBottomSheet(
context: context,
builder: (context) => AddAttrScreen(
(newAttrTitle) {
setState(() {
//adds the Attr to the list anytime the user presses "Add"
attr.add(Attr(name: newAttrTitle));
});
Navigator.pop(context);
//Hides the floating add Attr screen after pressing "Add"
},
),
);
//TODO Change it so the categories don't have to be selected every time. Instead, have the add button WITHIN each category.
// This floating button should instead create a new category.
},
),
drawer: DrawerMain(),
body: NestedScrollView(
//This allows for the top bar to collapse, while retaining the image.
headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
return <Widget>[
SliverAppBar(
expandedHeight: 200.0,
floating: true,
snap: true,
pinned: true,
flexibleSpace: Stack(
children: <Widget>[
Positioned.fill(
child: Image.asset(
img().toString(),
fit: BoxFit.cover,
))
],
),
),
];
},
body: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Row(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Padding(
padding: const EdgeInsets.all(15.0),
child: CircleAvatar(
maxRadius: 50.0,
backgroundImage: AssetImage("images/fox.jpeg")),
),
Container(
//TODO ADD ON PRESSED FUNCTION TO SOCIAL ICONS
margin: EdgeInsets.all(15.0),
child: Icon(
FontAwesomeIcons.facebook,
size: 40.0,
color: Color(0xFF306060),
),
),
Container(
margin: EdgeInsets.all(15.0),
child: Icon(
FontAwesomeIcons.instagram,
size: 40.0,
color: Color(0xFF306060),
),
),
],
),
Padding(
padding: const EdgeInsets.only(left: 15.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Text(
'Armando Pacheco Ortiz',
style: TextStyle(
fontSize: 25.0,
fontWeight: FontWeight.bold,
color: Color(0xFF306060)),
),
],
),
),
Padding(
padding: const EdgeInsets.only(left: 15.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Text(
'Freelance App Developer from Puerto Rico',
style: TextStyle(
fontSize: 20.0,
fontStyle: FontStyle.italic,
color: Color(0xFF306060)),
),
SizedBox(
child: Divider(),
),
],
),
),
Padding(
padding: const EdgeInsets.all(15.0),
child: Row(
children: <Widget>[
Text('Memories',
style: TextStyle(
fontSize: 20.0,
fontStyle: FontStyle.italic,
color: Color(0xFF306060),
fontWeight: FontWeight.bold))
],
),
),
//Horizontal scrolling images.
//TODO These need to update based on uploads, perhaps use something like google's face detection to auto add?
Padding(
padding: const EdgeInsets.all(15.0),
child: SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Container(
height: 310,
width: 200,
child: ClipRRect(
borderRadius: BorderRadius.circular(20.0),
child: (Image.asset(
'images/Mem6.jpg',
fit: BoxFit.cover,
)),
),
),
SizedBox(
width: 20,
),
Container(
height: 310,
width: 200,
//ClipRRect allows for it to have the border radius. Container is painted behind the image.
//For that reason, adding a border radius to the container doesn't work.
child: ClipRRect(
borderRadius: BorderRadius.circular(20.0),
child: (Image.asset(
'images/Mem2.JPG',
fit: BoxFit.cover,
)),
),
),
SizedBox(
width: 20,
),
Container(
height: 310,
width: 200,
child: ClipRRect(
borderRadius: BorderRadius.circular(20.0),
child: (Image.asset(
'images/memory - 4.jpeg',
fit: BoxFit.cover,
)),
),
),
我将代码粘贴到第一张图片的最下方，以显示如何在其他位置进行设置。
我不确定问题是否出在appBar内是随机图像，还是我缺少一些代码。希望有人能对此有所启发！
非常感谢。
1个回答
0
投票
投票
您可以在下面复制粘贴运行完整代码您的img()有错误，您返回了Image.asset并再次包装在Image.asset中，导致重复
Image.asset(
img().toString(),
fit: BoxFit.cover,
))
代码段仅返回image_name的字符串将起作用并且图像名称中不要包含空格
String img() {
int min = 0;
int max = randAppBarImg.length - 1;
rnd = Random();
int r = min + rnd.nextInt(max - min);
String image_name = randAppBarImg[r].toString();
//return Image.asset(image_name);
return image_name;
}
工作演示
完整代码
import 'package:flutter/material.dart';
import 'dart:math';
import 'package:font_awesome_flutter/font_awesome_flutter.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: ContactProfilePage(),
);
}
}
class Attr {
String name;
Attr({this.name});
}
class ContactProfilePage extends StatefulWidget {
@override
_ContactProfilePageState createState() => _ContactProfilePageState();
}
class _ContactProfilePageState extends State<ContactProfilePage> {
List<Attr> attr = [
Attr(name: ''),
];
dynamic randAppBarImg = [
"images/Mem2.JPG",
"images/Mem3.JPG",
/*"images/Mem4.JPG",
"images/Mem6.jpg",
"images/memory-1.jpeg",
"images/memory-2.jpeg",
"images/memory-3.jpeg",
"images/memory-4.jpeg",
"images/memory-5.jpeg",
"images/memory-6.jpeg",*/
];
Random rnd;
String img() {
int min = 0;
int max = randAppBarImg.length - 1;
rnd = Random();
int r = min + rnd.nextInt(max - min);
String image_name = randAppBarImg[r].toString();
//return Image.asset(image_name);
return image_name;
}
@override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(
backgroundColor: Colors.lightBlueAccent,
child: Icon(Icons.add),
onPressed: () {
//Modal sheet brings up the whole bottom pane when the plus button is pressed.
/* showModalBottomSheet(
context: context,
builder: (context) => AddAttrScreen(
(newAttrTitle) {
setState(() {
//adds the Attr to the list anytime the user presses "Add"
attr.add(Attr(name: newAttrTitle));
});
Navigator.pop(context);
//Hides the floating add Attr screen after pressing "Add"
},
),
);*/
//TODO Change it so the categories don't have to be selected every time. Instead, have the add button WITHIN each category.
// This floating button should instead create a new category.
},
),
//drawer: DrawerMain(),
body: NestedScrollView(
//This allows for the top bar to collapse, while retaining the image.
headerSliverBuilder:
(BuildContext context, bool innerBoxIsScrolled) {
return <Widget>[
SliverAppBar(
expandedHeight: 200.0,
floating: true,
snap: true,
pinned: true,
/*flexibleSpace: FlexibleSpaceBar(
centerTitle: true,
title: Text("",
style: TextStyle(
color: Colors.white,
fontSize: 16.0,
)),
background: Image.asset(
"images/Mem2.JPG",
fit: BoxFit.cover,
)),*/
flexibleSpace: Stack(
children: <Widget>[
Positioned.fill(
child: Image.asset(
img().toString(),
fit: BoxFit.cover,
))
],
),
),
];
},
body: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Row(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Padding(
padding: const EdgeInsets.all(15.0),
child: CircleAvatar(
maxRadius: 50.0,
backgroundImage: AssetImage("images/fox.jpeg")),
),
Container(
//TODO ADD ON PRESSED FUNCTION TO SOCIAL ICONS
margin: EdgeInsets.all(15.0),
child: Icon(
FontAwesomeIcons.facebook,
size: 40.0,
color: Color(0xFF306060),
),
),
Container(
margin: EdgeInsets.all(15.0),
child: Icon(
FontAwesomeIcons.instagram,
size: 40.0,
color: Color(0xFF306060),
),
),
],
),
Padding(
padding: const EdgeInsets.only(left: 15.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Text(
'Armando Pacheco Ortiz',
style: TextStyle(
fontSize: 25.0,
fontWeight: FontWeight.bold,
color: Color(0xFF306060)),
),
],
),
),
Padding(
padding: const EdgeInsets.only(left: 15.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Text(
'Freelance App Developer from Puerto Rico',
style: TextStyle(
fontSize: 20.0,
fontStyle: FontStyle.italic,
color: Color(0xFF306060)),
),
SizedBox(
child: Divider(),
),
],
),
),
Padding(
padding: const EdgeInsets.all(15.0),
child: Row(
children: <Widget>[
Text('Memories',
style: TextStyle(
fontSize: 20.0,
fontStyle: FontStyle.italic,
color: Color(0xFF306060),
fontWeight: FontWeight.bold))
],
),
),
//Horizontal scrolling images.
//TODO These need to update based on uploads, perhaps use something like google's face detection to auto add?
Padding(
padding: const EdgeInsets.all(15.0),
child: SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Container(
height: 310,
width: 200,
child: ClipRRect(
borderRadius: BorderRadius.circular(20.0),
child: (Image.asset(
'images/Mem6.jpg',
fit: BoxFit.cover,
)),
),
),
SizedBox(
width: 20,
),
Container(
height: 310,
width: 200,
//ClipRRect allows for it to have the border radius. Container is painted behind the image.
//For that reason, adding a border radius to the container doesn't work.
child: ClipRRect(
borderRadius: BorderRadius.circular(20.0),
child: Image.asset(
'images/Mem2.JPG',
fit: BoxFit.cover,
),
),
),
SizedBox(
width: 20,
),
Container(
height: 310,
width: 200,
child: ClipRRect(
borderRadius: BorderRadius.circular(20.0),
child: (Image.asset(
'images/memory-4.jpeg',
fit: BoxFit.cover,
)),
),
),
])))
]))));
}
}
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