flutter - Flutter : local_auth: ^0. 6.1 : PlatformException(error,您需要在此事件中使用Theme.AppCompat主题(或后代)。(null)

我在使用Local Auth软件包集成我的应用程序时遇到问题，我已经按照有关配置到我的应用程序包的文档进行操作。
在文档中说:

但是在我编辑 MainActivity.kt 后出现了问题:

package id.zeffry.debt_diary

import androidx.annotation.NonNull;
import io.flutter.embedding.android.FlutterFragmentActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugins.GeneratedPluginRegistrant

import android.os.Build
import android.view.ViewTreeObserver
import android.view.WindowManager
class MainActivity: FlutterFragmentActivity() {
    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
    }
}

日志

I/flutter (22608): PlatformException(error, You need to use a Theme.AppCompat theme (or descendant) with this activity., null)

来自文档的源代码:

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

//? Testing Local Auth( Finger Print , Face Recognition, etc)
class TestingPage extends StatefulWidget {
  static const routeNamed = "/testing-page";

  @override
  _TestingPageState createState() => _TestingPageState();
}

class _TestingPageState extends State<TestingPage> {
  final LocalAuthentication auth = LocalAuthentication();

  bool _canCheckBiometrics;

  List<BiometricType> _availableBiometrics;

  String _authorized = 'Not Authorized';

  bool _isAuthenticating = false;

  Future<void> _checkBiometrics() async {
    bool canCheckBiometrics;
    try {
      canCheckBiometrics = await auth.canCheckBiometrics;
    } on PlatformException catch (e) {
      print(e);
    }
    if (!mounted) return;

    setState(() {
      _canCheckBiometrics = canCheckBiometrics;
    });
  }

  Future<void> _getAvailableBiometrics() async {
    List<BiometricType> availableBiometrics;
    try {
      availableBiometrics = await auth.getAvailableBiometrics();
    } on PlatformException catch (e) {
      print(e);
    }
    if (!mounted) return;

    setState(() {
      _availableBiometrics = availableBiometrics;
    });
  }

  Future<void> _authenticate() async {
    bool authenticated = false;
    try {
      setState(() {
        _isAuthenticating = true;
        _authorized = 'Authenticating';
      });
      authenticated = await auth.authenticateWithBiometrics(
          localizedReason: 'Scan your fingerprint to authenticate',
          useErrorDialogs: true,
          stickyAuth: true);
      setState(() {
        _isAuthenticating = false;
        _authorized = 'Authenticating';
      });
    } on PlatformException catch (e) {
      print(e);
    }
    if (!mounted) return;

    final String message = authenticated ? 'Authorized' : 'Not Authorized';
    setState(() {
      _authorized = message;
    });
  }

  void _cancelAuthentication() {
    auth.stopAuthentication();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ConstrainedBox(
        constraints: const BoxConstraints.expand(),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          children: <Widget>[
            Text('Can check biometrics: $_canCheckBiometrics\n'),
            RaisedButton(
              child: const Text('Check biometrics'),
              onPressed: _checkBiometrics,
            ),
            Text('Available biometrics: $_availableBiometrics\n'),
            RaisedButton(
              child: const Text('Get available biometrics'),
              onPressed: _getAvailableBiometrics,
            ),
            Text('Current State: $_authorized\n'),
            RaisedButton(
              child: Text(_isAuthenticating ? 'Cancel' : 'Authenticate'),
              onPressed:
                  _isAuthenticating ? _cancelAuthentication : _authenticate,
            )
          ],
        ),
      ),
    );
  }
}

从真实设备更新错误:

java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
    at androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor(AppCompatDelegateImpl.java:686)
    at androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor(AppCompatDelegateImpl.java:649)
    at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:542)
    at androidx.appcompat.app.AppCompatDialog.setContentView(AppCompatDialog.java:95)
    at androidx.appcompat.app.AlertController.installContent(AlertController.java:232)
    at androidx.appcompat.app.AlertDialog.onCreate(AlertDialog.java:279)
    at android.app.Dialog.dispatchOnCreate(Dialog.java:389)
    at android.app.Dialog.show(Dialog.java:293)
    at androidx.fragment.app.DialogFragment.onStart(DialogFragment.java:486)
    at androidx.fragment.app.Fragment.performStart(Fragment.java:2627)
    at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:915)
    at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
    at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
    at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)
    at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2076)
    at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1866)
    at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1821)
    at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
    at androidx.fragment.app.FragmentManagerImpl.executePendingTransactions(FragmentManagerImpl.java:183)
    at androidx.biometric.BiometricPrompt.authenticateInternal(BiometricPrompt.java:749)
    at androidx.biometric.BiometricPrompt.authenticate(BiometricPrompt.java:658)
    at io.flutter.plugins.localauth.AuthenticationHelper$1.run(AuthenticationHelper.java:182)
    at android.os.Handler.handleCallback(Handler.java:754)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:165)
    at android.app.ActivityThread.main(ActivityThread.java:6375)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:802)

最佳答案

如果收到此错误:

Exception has occurred. PlatformException (PlatformException(error, You need to use a Theme.AppCompat theme (or descendant) with this activity., null))

然后，您需要执行以下操作:

转到android > app > src > main > res > values > style.xml

更改

<style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">

到

<style name="LaunchTheme" parent="Theme.AppCompat.Light.NoActionBar">

有关在Kotlin中设置MainActivity.kt的更多信息；造访这里:https://gist.github.com/akifarhan/f70a2c777651f2ea61a15eb92a5939c1

关于flutter - Flutter : local_auth: ^0. 6.1 : PlatformException(error,您需要在此事件中使用Theme.AppCompat主题(或后代)。(null)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/59441558/