Flutter光学字符识别插件tesseract的使用

Flutter光学字符识别插件tesseract的使用

该插件基于 Tesseract OCR。此插件使用了 Tesseract4Android 和 SwiftyTesseract。

示例代码

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:tesseract/tesseract.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Tesseract Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Home(),
    );
  }
}

class Home extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Tesseract Demo'),
        centerTitle: true,
      ),
      body: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            child: Padding(
              padding: EdgeInsets.symmetric(horizontal: 16),
              child: Column(
                children: [
                  ElevatedButton(
                      onPressed: () {
                        initTesseract();
                      },
                      child: Text('初始化 Tesseract')),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }

  initTesseract() async {
    // 初始化 Tesseract 并设置语言为英语
    var result = await Tesseract.initTesseract(language: 'eng');
    print(result);
  }
}

// 自定义卡片组件
class CustomCard extends StatelessWidget {
  final String label;
  final Widget viewPage;
  final FeatureStatus featureStatus;

  const CustomCard({
    required this.label,
    required this.viewPage,
    required this.featureStatus,
  });

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Card(
      elevation: 5,
      margin: EdgeInsets.only(bottom: 10),
      child: ListTile(
        tileColor: Theme.of(context).primaryColor,
        title: Text(
          label,
          style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
        ),
        onTap: () {
          if (Platform.isIOS &&
              (featureStatus.index == 0 || featureStatus.index == 1)) {
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(
                content: const Text('此功能尚未在 iOS 上实现'),
              ),
            );
          } else if (Platform.isAndroid &&
              (featureStatus.index == 0 || featureStatus.index == 2)) {
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(
                content: const Text('此功能尚未在 Android 上实现'),
              ),
            );
          } else if (!Platform.isAndroid && !Platform.isIOS) {
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(
                content: const Text('平台不支持'),
              ),
            );
          } else {
            Navigator.push(
              context,
              MaterialPageRoute(builder: (context) => viewPage),
            );
          }
        },
      ),
    );
  }
}

// 功能状态枚举
enum FeatureStatus { None, Android, IOS, Both }

完整示例Demo

以下是完整的示例代码，展示了如何使用 tesseract 插件进行光学字符识别（OCR）：

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:tesseract/tesseract.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Tesseract Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Home(),
    );
  }
}

class Home extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Tesseract Demo'),
        centerTitle: true,
      ),
      body: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            child: Padding(
              padding: EdgeInsets.symmetric(horizontal: 16),
              child: Column(
                children: [
                  ElevatedButton(
                    onPressed: () {
                      initTesseract();
                    },
                    child: Text('初始化 Tesseract'),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }

  initTesseract() async {
    // 初始化 Tesseract 并设置语言为英语
    var result = await Tesseract.initTesseract(language: 'eng');
    print(result);
  }
}