Flutter 颤振错误:类型';文件';没有找到。什么';这是怎么回事?
我正在尝试将Flutter 颤振错误:类型';文件';没有找到。什么';这是怎么回事?,flutter,flutter-dependencies,Flutter,Flutter Dependencies,我正在尝试将firebase\u ml\u vision与image\u picker一起使用 代码如下: import 'package:flutter/material.dart'; import 'package:image_picker/image_picker.dart'; import 'package:firebase_ml_vision/firebase_ml_vision.dart'; void main() => runApp(MyHomePage()); cla
firebase\u ml\u vision
与image\u picker
一起使用
代码如下:
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:firebase_ml_vision/firebase_ml_vision.dart';
void main() => runApp(MyHomePage());
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
FirebaseVisionImage visionImage;
final BarcodeDetector barcodeDetector = FirebaseVision.instance.barcodeDetector();
final TextRecognizer textRecognizer = FirebaseVision.instance.textRecognizer();
final ImageLabeler labeler = FirebaseVision.instance.imageLabeler(
ImageLabelerOptions(confidenceThreshold: 0.75),
);
final FaceDetector faceDetector = FirebaseVision.instance.faceDetector();
void detections() async {
final VisionText visionText = await textRecognizer.processImage(visionImage);
}
File _image;
Future getImage() async {
var image = await ImagePicker.pickImage(source: ImageSource.camera);
var something = await ImagePicker.pickImage(source: ImageSource.camera);
setState(() {
this.visionImage = FirebaseVisionImage.fromFile(something);
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Image Picker Example'),
),
body: Center(
child: _image == null
? Text('No image selected.')
: Image.file(_image),
),
floatingActionButton: FloatingActionButton(
onPressed: getImage,
tooltip: 'Pick Image',
child: Icon(Icons.add_a_photo),
),
);
}
}
导入“包装:颤振/材料.省道”;
导入“包:image_picker/image_picker.dart”;
导入“包:firebase_ml_vision/firebase_ml_vision.dart”;
void main()=>runApp(MyHomePage());
类MyHomePage扩展StatefulWidget{
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
FirebaseVisionImage;
final BarcodeDetector BarcodeDetector=FirebaseVision.instance.BarcodeDetector();
final TextRecognizer TextRecognizer=FirebaseVision.instance.TextRecognizer();
final ImageLabeler labeler=FirebaseVision.instance.ImageLabeler(
图像标签(置信度阈值:0.75),
);
final FaceDetector FaceDetector=FirebaseVision.instance.FaceDetector();
无效检测()异步{
final VisionText VisionText=等待文本识别器.processImage(visionImage);
}
文件图像;
Future getImage()异步{
var image=等待ImagePicker.pickImage(源:ImageSource.camera);
var something=等待ImagePicker.pickImage(来源:ImageSource.camera);
设置状态(){
this.visionImage=FirebaseVisionImage.fromFile(某物);
});
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(“图像选择器示例”),
),
正文:中(
子项:_image==null
?文本('未选择图像')
:Image.file(_Image),
),
浮动操作按钮:浮动操作按钮(
onPressed:getImage,
工具提示:“拾取图像”,
子:图标(图标。添加照片),
),
);
}
}
但是我无法使用文件
数据类型,这是我得到的错误:
以下是我运行“颤振医生”时得到的信息:
下面是我运行flatter--version
时得到的结果:
我是个新手,如果你还需要什么,请告诉我
谢谢大家! 文件类型在中,您缺少该文件类型。添加
导入'dart:io'
到文件顶部。在项目中添加图像选择器后,是否运行了flatter packages get
?@RubensMelo是的,我运行了。仍然得到相同的错误。