前期配置

配置 project\android\app\src\main\AndroidManifest.xml 添加权限

<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.USE_FINGERPRINT"/>
    <application
        android:label="demo03"
        android:name="${applicationName}"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme" /*默认配置*/
            android:theme="@style/Theme.AppCompat" /*替换配置*/
            ...
</manifest>

配置 project\android\app\src\main\kotlin\com\example\demo03\MainActivity.kt 修改继承类

默认的配置内容

package com.example.demo03
import io.flutter.embedding.android.FlutterActivity
class MainActivity: FlutterActivity() {}

更改文件内容为

import io.flutter.embedding.android.FlutterFragmentActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugins.GeneratedPluginRegistrant

class MainActivity: FlutterFragmentActivity() {
  override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
    GeneratedPluginRegistrant.registerWith(flutterEngine)
  }
}

此操作需要重新安装项目中相关的flutter依赖，flutter clean & flutter run

---

依赖运行及示例

只在真机上运行，虚拟机没有生物认证功能

安装

local_auth: ^2.2.0

示例

import 'package:flutter/material.dart';
import 'package:local_auth/local_auth.dart';
import 'package:local_auth_android/local_auth_android.dart';


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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: PageApp(),
    );
  }
}

class PageApp extends StatefulWidget {
  const PageApp({super.key});

  @override
  State<PageApp> createState() => _PageAppState();
}

class _PageAppState extends State<PageApp> {

  final LocalAuthentication auth = LocalAuthentication();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title:const Text("flutter生物认证")),
      body: Container(
        child:Column(
          children: [
            ElevatedButton(onPressed:()async{
              bool? canCheckBiometrics  = await auth.canCheckBiometrics;
              print("是否支持生物认证 ${canCheckBiometrics}");
            },
            child: const Text("生物认证")),
            ElevatedButton(onPressed:()async{
              List<BiometricType> listData  = await auth.getAvailableBiometrics();
              print("打印生物列表 ${listData}");
            },
            child: const Text("打印生物列表")),
            ElevatedButton(onPressed:()async{
              /**启动指纹认证 */
              final bool didAuthenticate = await auth.authenticate(
                localizedReason: '指纹验证',
                authMessages:const <AuthMessages>[
                  /**字段国际化 */
                  AndroidAuthMessages(
                    signInTitle: '指纹认证模块', /**图标大小：在对话框中显示为标题的消息，指示用户 */
                    biometricHint:"请将手指放到识别器内", /*提示消息，建议用户如何使用生物特征进行身份验证。*/
                    biometricNotRecognized:"指纹不匹配", /**消息，让用户知道身份验证失败。 */
                    biometricRequiredTitle:"尚未在其设备上设置生物特征验证", /**图标大小：在对话框中显示为标题的消息*/
                    biometricSuccess:"身份验证成功",/**消息，让用户知道身份验证已成功。 */
                    cancelButton: '取消', /**显示在按钮上的消息，用户可以单击该按钮离开*/
                    deviceCredentialsRequiredTitle:"在对话框中显示未标题信息", /**在对话框中显示为标题的消息*/
                    deviceCredentialsSetupDescription:"设置", /**建议用户转到设置和配置的消息 */
                    goToSettingsButton:"进入设置",/**按钮上显示的消息，用户可以单击该按钮进入设置页面 */
                    goToSettingsDescription:"请转到系统设置",/**建议用户转到设置和配置的消息 */
                  ),
                ]
              );
              print("识别结果 ${didAuthenticate}");
            },
            child: const Text("指纹识别"))
          ],
        )
      ),
    );
  }
}

效果及控制台打印