keyboard visibility breaks with integration of local_auth

[kendall-lu]

Same issue flutter/flutter#55750,

Keyboard_visibility, https://pub.dev/packages/keyboard_visibility breaks, with the integration of local_auth, https://pub.dev/packages/local_auth breaks keyboard listeners.
Steps to reproduce:

1. Changing FlutterActivity in MainActivity.kt to FlutterFragmentActivity will cause all of the keyboard listeners to break (this is a necessary step in local_auth to be able to detect forms of biometric authentication)
   Breaking code:

package com.example.testing

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);
    }
}

Logs for local_auth:

E/flutter (22989): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: PlatformException(no_fragment_activity, local_auth plugin requires activity to be a FragmentActivity., null)
E/flutter (22989): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:569:7)
E/flutter (22989): #1      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:321:33)
E/flutter (22989): <asynchronous suspension>
E/flutter (22989): #2      LocalAuthentication.authenticateWithBiometrics (package:local_auth/local_auth.dart:95:27)
E/flutter (22989): #3      _LoginState.authenticateWithBiometrics.<anonymous closure> (package:myapp/login/login.dart:99:48)
E/flutter (22989): #4      new Future.delayed.<anonymous closure> (dart:async/future.dart:316:39)
E/flutter (22989): #5      _rootRun (dart:async/zone.dart:1122:38)
E/flutter (22989): #6      _CustomZone.run (dart:async/zone.dart:1023:19)
E/flutter (22989): #7      _CustomZone.runGuarded (dart:async/zone.dart:925:7)
E/flutter (22989): #8      _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965:23)
E/flutter (22989): #9      _rootRun (dart:async/zone.dart:1126:13)
E/flutter (22989): #10     _CustomZone.run (dart:async/zone.dart:1023:19)
E/flutter (22989): #11     _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:949:23)
E/flutter (22989): #12     Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:23:15)
E/flutter (22989): #13     _Timer._runTimers (dart:isolate-patch/timer_impl.dart:384:19)
E/flutter (22989): #14     _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:418:5)
E/flutter (22989): #15     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)
E/flutter (22989): 

flutter doctor -v

[✓] Flutter (Channel stable, v1.12.13+hotfix.8, on Mac OS X 10.15.3 19D76, locale en-US)
    • Flutter version 1.12.13+hotfix.8 at /Users/kendalllu/flutter
    • Framework revision 0b8abb4724 (3 months ago), 2020-02-11 11:44:36 -0800
    • Engine revision e1e6ced81d
    • Dart version 2.7.0

[!] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at /Users/kendalllu/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)
    ✗ Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup for detailed instructions.

[✓] Xcode - develop for iOS and macOS (Xcode 11.4.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.4.1, Build version 11E503a
    • CocoaPods version 1.9.0

[✓] Android Studio (version 3.6)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 44.0.2
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[!] IntelliJ IDEA Community Edition (version 2019.3.2)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.dev/intellij-setup/#installing-the-plugins

[✓] VS Code (version 1.42.1)
    • VS Code at /Users/kendalllu/Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.9.1

[viktor-morin]

I just got stuck on the same issue, any suggestions?

[kendall-lu]

I just got stuck on the same issue, any suggestions?

Hey, i ended up creating a work around ( i noticed that the only times a keyboard shows up is when a TextField is focused). In my initState i checked whether the Platform.isAndroid, in that condition I added listeners to my focusNodes and checked whether any one of my focusNode.hasFocus. By no means is this a catch all solution.

 if (Platform.isAndroid) {

      focusNode1.addListener((){
        // Your listener here
      });
    } else {
      KeyboardVisibilityNotification().addNewListener(
      onChange: (bool visible) {
        setState((){
          isKeyboardVisible = visible;
        });
      },
    );
    }

[viktor-morin]

I just got stuck on the same issue, any suggestions?

Hey, i ended up creating a work around ( i noticed that the only times a keyboard shows up is when a TextField is focused). In my initState i checked whether the Platform.isAndroid, in that condition I added listeners to my focusNodes and checked whether any one of my focusNode.hasFocus. By no means is this a catch all solution.

 if (Platform.isAndroid) {

      focusNode1.addListener((){
        // Your listener here
      });
    } else {
      KeyboardVisibilityNotification().addNewListener(
      onChange: (bool visible) {
        setState((){
          isKeyboardVisible = visible;
        });
      },
    );
    }

The reason why I use this package is that you can have a general listner on the event when the keyboard is shown, otherwise I need to setup all textfields and their focusnode. It kind of work against the purpose if this package right?

[viktor-morin]

Flutter Keyboard Visibility

@kendall-lu
Same issue is now resolved for package mention above