如何在flutter应用程序中创建基于图像的提要？

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:firebase_ml_vision/firebase_ml_vision.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Image Summary',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: ImageSummaryPage(),
    );
  }
}

class ImageSummaryPage extends StatefulWidget {
  @override
  _ImageSummaryPageState createState() => _ImageSummaryPageState();
}

class _ImageSummaryPageState extends State<ImageSummaryPage> {
  File _image;
  List<ImageLabel> _labels = [];

  Future getImage() async {
    var image = await ImagePicker.pickImage(source: ImageSource.gallery);

    setState(() {
      _image = image;
    });

    analyzeImage();
  }

  Future analyzeImage() async {
    final FirebaseVisionImage visionImage = FirebaseVisionImage.fromFile(_image);
    final ImageLabeler labeler = FirebaseVision.instance.imageLabeler();

    final List<ImageLabel> labels = await labeler.processImage(visionImage);

    setState(() {
      _labels = labels;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Image Summary'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            _image == null
                ? Text('No image selected.')
                : Image.file(_image),
            SizedBox(height: 20),
            RaisedButton(
              onPressed: getImage,
              child: Text('Select Image'),
            ),
            SizedBox(height: 20),
            _labels.isEmpty
                ? Text('No labels found.')
                : Expanded(
                    child: ListView.builder(
                      itemCount: _labels.length,
                      itemBuilder: (BuildContext context, int index) {
                        final label = _labels[index];
                        return ListTile(
                          title: Text(label.text),
                          subtitle: Text('Confidence: ${label.confidence.toStringAsFixed(2)}'),
                        );
                      },
                    ),
                  ),
          ],
        ),
      ),
    );
  }
}