I am having a very difficult time with making Flutter work with Unity. There is a library called flutter_unity_widget by xraph.com on pub.dev which I am trying to make work.

Specs:

• Android, not using emulators/simulators and just my real/physical phone (Samsung Galaxy Z Fold 4 on Android v14 API 34)

• Unity 2022.3.30f1. Currently downloading to try on 2022.2.0f1 as the current fuw-XXXX.unitypackage file, found in the unitypackages folder. “Try to use the most recent unitypackage available.” is what the dev wrote, and the current versions in the github folder is fuw-2022.2.0, fuw-2022.1.7f1, fuw-2022.1.1-v2. The versions correspond to Unity Version.

• Flutter

flutter doctor -v
  [√] Flutter (Channel stable, 3.19.2, on Microsoft Windows [Version 10.0.19045.4780], locale en-CA)
  • Flutter version 3.19.2 on channel stable at C:\Users\plazm\flutter
  • Upstream repository https://github.com/flutter/flutter.git
  • Framework revision 7482962148 (7 months ago), 2024-02-27 16:51:22 -0500
  • Engine revision 04817c99c9
  • Dart version 3.3.0
  • DevTools version 2.31.1

[√] Windows Version (Installed version of Windows is version 10 or higher)

[√] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
• Android SDK at C:\Users\plazm\AppData\Local\Android\sdk
• Platform android-34, build-tools 34.0.0
• Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
• Java version OpenJDK Runtime Environment (build 17.0.9+0--11185874)
• All Android licenses accepted.

[√] Chrome - develop for the web
• Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[!] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.9.6)
• Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
• Visual Studio Community 2022 version 17.9.34728.123
X Visual Studio is missing necessary components. Please re-run the Visual Studio installer for
the "Desktop development with C++" workload, and include these components:
MSVC v142 - VS 2019 C++ x64/x86 build tools
- If there are multiple build tool versions available, install the latest
C++ CMake tools for Windows
Windows 10 SDK

[√] Android Studio (version 2023.2)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 17.0.9+0--11185874)

[√] VS Code (version 1.93.0)
• VS Code at C:\Users\plazm\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.96.0

[√] Connected device (4 available)
• SM F936U (mobile) • RFCW41NBL4H • android-arm64  • Android 14 (API 34)
• Windows (desktop) • windows     • windows-x64    • Microsoft Windows [Version
10.0.19045.4780]
• Chrome (web)      • chrome      • web-javascript • Google Chrome 128.0.6613.114
• Edge (web)        • edge        • web-javascript • Microsoft Edge 128.0.2739.42

[√] Network resources
• All expected network resources are available.

! Doctor found issues in 1 category.

• flutter configurations:

static int compileSdkVersion = 34
static int minSdkVersion = 24
static int targetSdkVersion = 33
static String ndkVersion = "23.1.7779620"

This is all in C:UsersMyPCflutterpackagesflutter_toolsgradlesrcmaingroovyflutter.groovy

• This is my main.dart

import 'package:flutter/material.dart';
import 'package:flutter_unity_widget/flutter_unity_widget.dart';

void main() {
  runApp(
    const MaterialApp(
      home: UnityDemoScreen(),
    ),
  );
}

class UnityDemoScreen extends StatefulWidget {
  const UnityDemoScreen({Key? key}) : super(key: key);

  @override
  State<UnityDemoScreen> createState() => _UnityDemoScreenState();
}

class _UnityDemoScreenState extends State<UnityDemoScreen> {
  static final GlobalKey<ScaffoldState> _scaffoldKey =
  GlobalKey<ScaffoldState>();
  UnityWidgetController? _unityWidgetController;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: _scaffoldKey,
      body: SafeArea(
        bottom: false,
        child: WillPopScope(
          onWillPop: () async {
            // Pop the category page if Android back button is pressed.
            return true;
          },
          child: Container(
            color: Colors.yellow,
            child: UnityWidget(
              onUnityCreated: onUnityCreated,
            ),
          ),
        ),
      ),
    );
  }

  // Callback that connects the created controller to the unity controller
  void onUnityCreated(controller) {
    _unityWidgetController = controller;
  }
}

• pubspec.yaml

name: flutter_unity
description: "A new Flutter project."
publish_to: 'none'

version: 1.0.0+1

environment:
  sdk: '>=3.3.0 <4.0.0'

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^1.0.6
  flutter_unity_widget: ^2022.2.1

dev_dependencies:
  flutter_test:
    sdk: flutter

  flutter_lints: ^3.0.0

flutter:
  uses-material-design: true

• IDE

Android Studio Iguana | 2023.2.1 Patch 1
Build #AI-232.10300.40.2321.11567975, built on March 13, 2024
Runtime version: 17.0.9+0--11185874 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Windows 10.0
GC: G1 Young Generation, G1 Old Generation
Memory: 2048M
Cores: 8
Registry:
    ide.experimental.ui=true
    ide.images.show.chessboard=true

Non-Bundled Plugins:
    Dart (232.10313)
    io.flutter (79.0.1)

I followed all the instructions on the documentation page for Android on the main github (https://github.com/juicycleff/flutter-unity-view-widget/tree/master) as well as the pub.dev (https://pub.dev/packages/flutter_unity_widget) and bunch of Youtube video tutorials and online articles which all did conflicting steps, were outdated, and did not work.

When I try to do it myself with no other functionality other than to just start it and display it, I get the following error message which is infinitely repeated and nothing shows up on the phone screen.

Full output trimmed as it was too long

...
E/BufferQueueProducer(21658): [ImageReader-904x2190f22m4-21658-0](id:549a00000002,api:1,p:1619,c:21658) dequeueBuffer: BufferQueue has been abandoned
I/ViewRootImpl@a411167[MainActivity](21658): onDisplayChanged oldDisplayState=2 newDisplayState=2
E/BufferQueueProducer(21658): [ImageReader-904x2190f22m4-21658-0](id:549a00000002,api:1,p:1619,c:21658) dequeueBuffer: BufferQueue has been abandoned
E/BufferQueueProducer(21658): [ImageReader-904x2190f22m4-21658-0](id:549a00000002,api:1,p:1619,c:21658) dequeueBuffer: BufferQueue has been abandoned

Under known issues, it says Unity freezes and crashes on Android, please use OpenGL3 as Graphics API.
I have tried doing this, no difference.

I manually stop the program up there as the “BufferQueue has been abandoned” message gets repeated infinitely and on the screen is just the page full of yellow.