flutter - ImagePickerWeb 输出是 File$ 而不是 File
问题描述
我正在使用 ImagePickerWeb 允许用户从我的应用上传照片
Future<void> getPhotos() async {
var imageFile = await ImagePickerWeb.getImage(outputType: ImageType.file);
print(imageFile);
if (imageFile != null) {
setState(() {
currentSelfie = imageFile;
_accDetails['customer_selfie'] = currentSelfie;
});
}
当我尝试通过 Image.File 显示图像时
Image.file(
currentSelfie,
height: screenAwareSize(100, context),
width: screenAwareSize(100, context),
fit: BoxFit.fill,
),
我收到这个错误
File$ ([object File]) :<getObject: NoSuchMethodError: The getter 'uri' was called on null.>
我正在使用我的文件格式,因为我正在将图像传递给我的后端服务器,并将数据作为文件接收。任何帮助,将不胜感激。
解决方案
您可以在下面复制粘贴运行完整代码
根据所有者的描述https://github.com/Ahmadre/image_picker_web#how-do-i-get-all-informations-out-of-my-imagevideo-eg-image-and- file-in-one-run
您可以使用ImagePickerWeb.getImageInfo
和显示带有Image.memory
代码片段的图像
Future<void> getPhotos() async {
var mediaData = await ImagePickerWeb.getImageInfo;
String mimeType = mime(Path.basename(mediaData.fileName));
html.File mediaFile =
new html.File(mediaData.data, mediaData.fileName, {'type': mimeType});
print("imageFile ${mediaData.toString()}");
if (mediaData != null) {
currentSelfie = mediaData.data;
setState(() {});
}
}
...
currentSelfie == null
? Container()
: Image.memory(
(currentSelfie),
fit: BoxFit.fill,
),
工作演示
完整代码
import 'dart:async';
import 'dart:io';
import 'package:mime_type/mime_type.dart';
import 'package:path/path.dart' as Path;
import 'package:flutter/material.dart';
import 'package:image_picker_web/image_picker_web.dart';
import 'dart:html' as html;
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
var currentSelfie;
Future<void> getPhotos() async {
var mediaData = await ImagePickerWeb.getImageInfo;
String mimeType = mime(Path.basename(mediaData.fileName));
html.File mediaFile =
new html.File(mediaData.data, mediaData.fileName, {'type': mimeType});
print("imageFile ${mediaData.toString()}");
if (mediaData != null) {
currentSelfie = mediaData.data;
setState(() {});
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
currentSelfie == null
? Container()
: Image.memory(
(currentSelfie),
fit: BoxFit.fill,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: getPhotos,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
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