Flutter通过flutter_unity_widget嵌入Unity3D
实现方案：采用flutter开源组件flutter_unity_widget
环境搭建Unity
1、创建flutter项目flutter_unity_demo
2、在pubspec.paml文件dependencies添加flutter_unity_widget: ^2022.2.0，执行Pub get导入组件
3、在工程目录下创建unity文件夹
4、在unity目录下创建unity_demo的3D工程
5、下载flutter_unity_widget提供的unity插件
在unity_demo项目Assets右键导入（import package）插件unitypackages（注：我导入的是FlutterUnityIntegration-v4-WithDemo）会得到以下目录，这个时候Flutter打包的方式如下图
7、修改Assets/FlutterUnityIntegration/Editor/Build.cs文件
DoBuildAndroid方法：
var options = BuildOptions.AcceptExternalModificationsToPlayer;
替换为：
var options = BuildOptions.AllowDebugging;
EditorUserBuildSettings.exportAsGoogleAndroidProject = true;
BuildIOS 方法：
var options = BuildOptions.AcceptExternalModificationsToPlayer;
替换为：
var options = BuildOptions.AllowDebugging;
8、为了方便测试创建Cube，绑定Assets/FlutterUnityIntegration/Demo/Rotote.cs脚本并调整好摄像头对准新创建的Cube
Flutter加载unity
- 创建UnityPage页面实现以下代码
import 'package:flutter/material.dart';
import 'package:flutter_unity_widget/flutter_unity_widget.dart';
class UnityPage extends StatefulWidget {
const UnityPage({super.key});
@override
_UnityPageState createState() => _UnityPageState();
}
class _UnityPageState extends State
UnityWidgetController? _unityWidgetController;
double _sliderValue = 0.0;
@override
void initState() {
// TODO: implement initState
super.initState();
}
@override
void dispose() {
// TODO: implement dispose
_unityWidgetController?.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
appBar: AppBar(
title: const Text("this Unity"),
),
body: Container(
child: Stack(
children: [
UnityWidget(
onUnityCreated: onUnityCreated,
onUnityMessage: onUnityMessage,
onUnitySceneLoaded: onUnitySceneLoaded,
fullscreen: false),
Positioned(
bottom: 10,
left: 15,
right: 15,
child: Container(
width: MediaQuery.of(context).size.width,
child: Column(
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: Slider(
onChanged: (value) {
setState(() {
_sliderValue = value;
});
setRotationSpeed(value.toString());
},
value: _sliderValue,
min: 0,
max: 20,
),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
MaterialButton(
onPressed: () {
_unityWidgetController!.pause();
},
child: const Text("Pause"),
),
// Expanded(child: SizedBox()),
MaterialButton(
onPressed: () {
_unityWidgetController!.resume();
},
child: const Text("Resume"),
),
],
),
],
),
)),
],
),
),
);
}
void setRotationSpeed(String speed) {
//这里需要看看给3d模型绑定的脚本
_unityWidgetController!.postMessage(
'Cube',
'SetRotationSpeed',
speed,
);
}
void onUnitySceneLoaded(scene) {
print('Received scene loaded from unity: ${scene.name}');
print('Received scene loaded from unity buildIndex: ${scene.buildIndex}');
}
void onUnityMessage(message) {}
void onUnityCreated(controller) {
this._unityWidgetController = controller;
}
}
2、在main.dart修改flutter启动页面为UnityPage
3、等待原生集成unity后运行
iOS集成
1、打开unity项目 file - Build Setings选择iOS（iOS打包插件没安装点击右侧按钮安装）设置需要的配置信息
- 使用flutter - export ios生成iOS工程文件，文件会自动创建到flutter项目下ios文件夹内
- 打开flutter项目内iOS工程Runner.xcworkspace，在终端cd 到flutter项目内iOS目录下。执行pod install 导入flutter引用的组件
导入UnityLibrary工程，在Runner工程目录下方空白右键Add Files to “Runner”，选择UnityLibrary/Unity-iPhone.xcodeproj，点击Add添加，会得到如下工程目录结构
5、绑定一下Unity-iPhone Data资源，编译一下Unity-iPhone
6、在Runner工程中添加UnityFramework.framework
7、通过flutter_unity_widget初始化unity项目
swift：打开ios/Runner/AppDelegate.swift 添加一下代码
import UIKit
import Flutter
+ import flutter_unity_widget
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
+ InitUnityIntegrationWithOptions(argc: CommandLine.argc, argv: CommandLine.unsafeArgv, launchOptions)
GeneratedPluginRegistrant.register(with: self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
}
Object-C：打开ios/Runner/main.m 添加一下代码
+ #import "flutter_unity_widget.swift.h"
int main(int argc, char * argv[]) {
@autoreleasepool {
+ InitUnityIntegration(argc, argv);
return UIApplicationMain(argc,argv,nil, NSStringFromClass([AppDelegate class]));
}
}
8、在Runner项目中ios/Runner/Info.plist添加flutterH5桥梁
+
+
运行flutter至iOS得到以下界面：
Android集成
1、打开unity项目 file - Build Setings选择Android（Android打包插件没安装点击右侧按钮安装）设置需要的配置信息
2、使用flutter - export Android生成Android工程文件，文件会自动创建到flutter项目下android文件夹内，也会自动导入Android项目
3、配置NDK信息打开android/local.properties添加ndk.dir=/Applications/Unity/Hub/Editor/2020.3.19f1/PlaybackEngines/AndroidPlayer/NDK 注：2020.3.19f1替换为自己安装的unity版本号
- 打开android/app/build.gradle增加以下代码
dependencies {
+ implementation project(':unityLibrary')
}
buildTypes {
release {
signingConfig signingConfigs.debug
}
+ debug {
+ signingConfig signingConfigs.debug
+ }
+ profile {
+ signingConfig signingConfigs.debug
+ }
+ innerTest {
+ matchingFallbacks = ['debug', 'release']
+ }
}
- 打开gradle.properties添加：
unityStreamingAssets=.unity3d, google-services-desktop.json, google-services.json, GoogleService-Info.plist
注：运行遇到minSdkVersion版本报错，修改/flutter/packages/flutter_tools/gradle/flutter.gradle里的minSdkVersion
运行Flutter到Android设备得到：
