错误：PlatformException（no_fragment_activity，local_auth 插件要求活动是 FragmentActivity。，null）

Question

Getting this error while using local_auth version 0.6.0 It's working fine for iOS but getting this error in android. Already have implemented class MainActivity: FlutterFragmentActivity() but still getting this issue

Answer 1

This is what i did to solve this issue

Change MainActivity.kt as below

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);
    }
}

However, after changing this MainActivity.kt , I also faced some other issue with the Theme.AppCompat . Check this out https://gist.github.com/akifarhan/f70a2c777651f2ea61a15eb92a5939c1 for the solution.

Answer 2

change your main activity to override FlutterFragmentActivity

import android.os.Bundle
import io.flutter.app.FlutterFragmentActivity
import io.flutter.plugins.GeneratedPluginRegistrant

class MainActivity: FlutterFragmentActivity() {
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      GeneratedPluginRegistrant.registerWith(this)
  }
}

if you are using flutter embedding version 2

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

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

Answer 3

I am using local_auth 0.6.2+3

My MainActivity.kt

 package xx.xx.xxx
 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);
   }
}

I was using SplashScreenUntilFirstFrame meta tag, Removing it from my main/AndroidManifest.xml works absolutely fine now.

<meta-data
android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
android:value="true"/>

Answer 4

Flutter details

Flutter version 1.22.4 at /Users/macbookpro/Desktop/development/flutter

• Framework revision 1aafb3a8b9 (4 weeks ago), 2020-11-13 09:59:28 -0800
• Engine revision 2c956a31c0
• Dart version 2.10.4
• local_auth: ^0.6.3+4

If you are using java then change your main activity to this

import androidx.annotation.NonNull;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.embedding.android.FlutterFragmentActivity;
import io.flutter.plugins.GeneratedPluginRegistrant;
import io.flutter.embedding.android.FlutterActivity;
public class MainActivity extends FlutterFragmentActivity{
}

Answer 5

2nd answer worked fine if we remove @NotNull like

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

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

Answer 6

Add the following line to the dependencies in your app level build.gradle file:

dependencies{
    api "androidx.core:core:1.1.0-aplha03"
}

Answer 7

In my case, i forgot to change in AndroidManifest.xml file. Complete changes for reference

MainActivity.java

import android.os.Bundle;
import io.flutter.app.FlutterFragmentActivity;
import io.flutter.plugins.flutter_plugin_android_lifecycle.FlutterAndroidLifecyclePlugin;
import io.flutter.plugins.localauth.LocalAuthPlugin;

public class MainActivity extends FlutterFragmentActivity  {
  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FlutterAndroidLifecyclePlugin.registerWith(
                registrarFor(
                        "io.flutter.plugins.flutter_plugin_android_lifecycle.FlutterAndroidLifecyclePlugin"));
        LocalAuthPlugin.registerWith(registrarFor("io.flutter.plugins.localauth.LocalAuthPlugin"));
    }
}

Then

AndroidManifest.xml

From

  <application
        android:label="<name>"
        android:icon="@mipmap/ic_launcher">
        <activity
           android:name="io.flutter.embedding.android.FlutterActivity"
           ....

To

  <application
        android:label="<name>"
        android:icon="@mipmap/ic_launcher">
        <activity
           android:name="io.flutter.embedding.android.FlutterFragmentActivity"
           ....

Answer 8

I tried adding the code in MainActivity.kt. For some reason, it doesn't take the code from MainActivity.kt and only searches for MainActivity.java. So the following code in MainActivity.java fixed the issue for me.

MainActivity.java

package com.<package_name>;

import android.os.Bundle;
import io.flutter.embedding.android.FlutterFragmentActivity;
import androidx.annotation.NonNull;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugins.GeneratedPluginRegistrant;
import io.flutter.plugins.flutter_plugin_android_lifecycle.FlutterAndroidLifecyclePlugin;
import io.flutter.plugins.localauth.LocalAuthPlugin;

public class MainActivity extends FlutterFragmentActivity {

    public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) 
    {
      GeneratedPluginRegistrant.registerWith(flutterEngine);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
}

Answer 9

From the docs -https://pub.dev/documentation/local_auth/latest/

Simply use the code below in your MainActivity.kt

 package [package ID here]

    import io.flutter.embedding.android.FlutterFragmentActivity
    
    class MainActivity: FlutterFragmentActivity() {
    }

Uninstall your current build of the app and then rebuild again

By the way, ensure you're not making multiple calls for

 auth.authenticate(...)