Flutter硬件交互插件mantra_mfs100的使用

它支持大部分Mantra MFS 100 SDK。

特性

1. 指纹捕获
2. 使用ISO模板进行指纹匹配

重要信息

重要提示： Mantra MFS 100 SDK的.jar文件和其他库文件是必须的，以便使用此插件。您可以从示例部分获取.jar文件和库文件。别忘了检查app级别的gradle文件以更好地理解这一点。

完整示例代码

以下是使用mantra_mfs100插件的基本示例代码：

import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:mantra_mfs100/mantra_mfs100.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with MSF100Event {

  String _platformVersion = 'Unknown';

  late MantraMfs100 mfs;

  String status = 'Disconnected';

  bool _isCapturing = false;

  Uint8List? memoryImage;

  List<int> firstTemplate = [];

  [@override](/user/override)
  void initState() {
    super.initState();
    mfs = MantraMfs100(this);
    mfs.init();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              const Text('MFS100'),
              Text(status),
            ],
          ),
        ),
        body: Center(
          child: Column(
            children: [
              // 显示捕获到的指纹图像
              memoryImage != null
                  ? Image.memory(memoryImage!, height: 128, width: 128)
                  : const SizedBox(),

              const SizedBox(height: 20),

              // 捕获指纹按钮
              TextButton(
                  onPressed: () async {
                    try {
                      if (_isCapturing) return;
                      _isCapturing = true;
                      FingerData res = await mfs.startAutoCapture(6000, true);

                      firstTemplate.clear();
                      firstTemplate.addAll(res.iSOTemplate);

                      setState(() {
                        _platformVersion = 'Success ${res.quality}';
                        memoryImage = Uint8List.fromList(res.fingerImage);
                        debugPrint('onCapturing-> ${res.iSOTemplate}');
                        print('onCapturing-> Length: ${res.iSOTemplate.length}');
                      });
                    } catch (err, stack) {
                      if (err is PlatformException) {
                        setState(() {
                          _platformVersion = err.message.toString();
                        });
                      }
                      print('While Capturing-> $err, $stack');
                    } finally {
                      _isCapturing = false;
                    }
                  },
                  child: const Text('Capture')),

              const SizedBox(height: 20),

              // 匹配指纹按钮
              TextButton(
                  onPressed: () async {
                    try {
                      if (_isCapturing) return;
                      _isCapturing = true;

                      FingerData res = await mfs.startAutoCapture(6000, true);

                      var ret = await mfs.matchISO(
                          Uint8List.fromList(firstTemplate),
                          Uint8List.fromList(res.iSOTemplate));

                      if (ret < 0) {
                        setState(() {
                          _platformVersion = 'Error: ${mfs.getErrorMsg(ret)}';
                        });
                      } else {
                        if (ret >= 96) {
                          setState(() {
                            _platformVersion = 'Finger matched with score: $ret';
                          });
                        } else {
                          setState(() {
                            _platformVersion = 'Finger not matched, score: $ret';
                          });
                        }
                      }
                    } catch (err, stack) {
                      if (err is PlatformException) {
                        setState(() {
                          _platformVersion = err.message.toString();
                        });
                      }
                      print('While Verifying-> $err, $stack');
                    } finally {
                      _isCapturing = false;
                    }
                  },
                  child: const Text('Match')),

              const SizedBox(height: 20),

              // 停止自动捕获按钮
              TextButton(
                  onPressed: () async {
                    if (!_isCapturing) return;
                    var res = await mfs.stopAutoCapture();
                    _isCapturing = false;
                  },
                  child: const Text('Stop')),

              // 状态显示
              Text('Status: $_platformVersion\n'),
            ],
          ),
        ),
      ),
    );
  }

  // 设备连接时调用的方法
  [@override](/user/override)
  void onDeviceAttached(bool hasPermission) {
    setState(() {
      status = 'Connected';
    });
    print('onDeviceAttached-> $hasPermission');
  }

  // 设备断开连接时调用的方法
  [@override](/user/override)
  void onDeviceDetached() {
    setState(() {
      status = 'Disconnected';
    });
    print('onDeviceDetached: ---');
  }

  [@override](/user/override)
  void onHostCheckFailed(String var1) {}

  // 释放资源时调用的方法
  [@override](/user/override)
  void dispose() {
    mfs.unInit();
    mfs.dispose();
    super.dispose();
  }

  // 测试方法
  test() {
    List<int> first = [1, 2, 3, 4];
    List<int> second = List.filled(first.length, 0);
    List.copyRange(second, 0, first);
    print('New range $second');
  }
}