I/颤振( 805)：PlatformException(no_fragment_activity，local_auth插件要求活动为FragmentActivity.，null，null)

Question

我是颤振的初学者，我用local_auth: ^1.1.6来验证我的应用指纹。当我触摸手指打印图标，但我得到一个流动的错误。

I/颤振( 805)：PlatformException(no_fragment_activity，local_auth插件要求活动为FragmentActivity.，null，null)

我的颤振版本2.2.1 / Dart版本.13.1

有人知道什么解决办法吗？

谢谢

这里是我的密码

 final LocalAuthentication _localAuthentication = LocalAuthentication();
  String _message = "Not Authorized";

  Future<bool> checkingForBioMetrics() async {
    bool canCheckBiometrics = await _localAuthentication.canCheckBiometrics;
    print(canCheckBiometrics);return canCheckBiometrics;
  }
  Future<void> _authenticateMe() async {
    // 8. this method opens a dialog for fingerprint authentication.
    //    we do not need to create a dialog nut it popsup from device natively.
    bool authenticated = false;
    try {
      authenticated = await
      // ignore: deprecated_member_use
      _localAuthentication.authenticateWithBiometrics(
        localizedReason: "Authenticate for Testing",
        // message for dialog
        useErrorDialogs: true,
        // show error in dialog
        stickyAuth: true,
      );
      setState(() {_message = authenticated ? "Authorized" : "Not Authorized";
      });
    } catch (e) {
      print(e);
    }if (!mounted) return;

  }

  @override
  void initState(){
    checkingForBioMetrics();
    super.initState();
  }

  TextEditingController _phoneController = new TextEditingController();
  TextEditingController passwordController = new TextEditingController();
  bool isSeen = true;
  bool isSignIn = false;
  check (BuildContext context){
    if(_phoneController.text.length > 10 && passwordController.text.length > 5){
      setState(() {
        isSignIn = true;
      });
    }else{
      isSignIn = false;
    }
  }





  Container(
                            child: InkWell(
                              onTap: (){
                                _authenticateMe();
                              },
                              child: Container(
                                padding: EdgeInsets.only(right: 0,),
                                child: Image.asset("assets/icons/ic_finger_print.png",scale:7.1,),
                              ),
                            ),
                          ),

Answer 1

首先要做的是添加权限(您可能已经这样做了)：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.[your.package]">
  <uses-permission android:name="android.permission.USE_FINGERPRINT"/>
  <application...
    ...
    ...
    ...
<manifest>

然后需要将FlutterActivity更改为FlutterFragmentActivity

package com.[your.package]

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

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

如果您碰巧遇到Theme.AppCompat问题或收到此错误：

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

那么你需要这样做：

去android>app>src>main>res>values>style.xml。改变这一点：

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

至

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