概要
Demo 说明
Demo 通过 flutter-unity-view-widget 库，达到 Flutter 内嵌 Unity 目的
主要功能：
- flutter-unity-view-widget 为 Unity 提供依赖库导出插件，将 Unity 项目构建成 Android、IOS 依赖库
- flutter-unity-view-widget 为 Flutter 提供组件库，将 Unity 视图以组件的形式渲染，并提供 Flutter、Unity 双向通信接口
Demo 预览
开发环境
Demo 使用了两个操作系统，所以会产生一些操作不便之处
win10：Unity 开发环境
macOS：APP 开发环境
macOS 环境操作，标记为macOS。未标记的，都是 win10 环境操作
Flutter API 文档
UnityWidget 组件属性
- fullscreen
布尔值，是否全屏显示 UnityWidget 组件
UnityWidget 组件生命周期
- onUnityMessage(data)
触发时机：Unity 通过 SendMessageToFlutter 发布消息 - onUnitySceneLoaded(String name, int buildIndex, bool isLoaded, bool isValid)
触发时机：Unity 场景加载完成 - onUnityUnloaded()
触发时机：Unity 场景被销毁
UnityWidgetController API
- pause()
暂停 Unity 循环 - resume()
继续 Unity 循环 - unload()
销毁 Unity 场景 - quit()
退出 Unity 应用 - postMessage(String gameObject, methodName, message)
调用 Unity 类方法
Unity API 文档
- SendMessageToFlutter(string)
发布消息，Flutter 通过 onUnityMessage 订阅消息
初始化 Unity 项目
新建项目
Unity 版本要求：2019.4.3+
替换案例场景
新建方块 Cube、空物体 CanvasController
安装 Unity 插件
克隆 git 仓库
git clone https://github.com/juicycleff/flutter-unity-view-widget.git
插件粘贴至 Unity 项目
mkdir ./demoFlutterUnity/ThirdpartyPackage
cp ./flutter-unity-view-widget/scripts/FlutterUnityIntegration-v4.1.0.unitypackage ./demo_flutter_unity/unity/demoFlutterUnity/ThirdpartyPackage/FlutterUnityIntegration-v4.1.0.unitypackage
Unity 项目编写
编写脚本
- UMMInject.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class UMMInject : MonoBehaviour
{
void Start()
{
gameObject.AddComponent<UnityMessageManager>();
}
}
- CubeInteraction.cs
using System;
using UnityEngine;
using UnityEngine.EventSystems;
public class CubeInteraction: MonoBehaviour, IEventSystemHandler
{
[SerializeField]
Vector3 RotateAmount;
void Start()
{
RotateAmount = new Vector3(1, 1, 1);
}
void Update()
{
gameObject.transform.Rotate(RotateAmount * Time.deltaTime * 10);
for (int i = 0; i < Input.touchCount; ++i)
{
if (Input.GetTouch(i).phase.Equals(TouchPhase.Began))
{
var hit = new RaycastHit();
Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(i).position);
if (Physics.Raycast(ray, out hit))
{
UnityMessageManager.Instance.SendMessageToFlutter("方块被触碰");
}
}
}
}
// （Flutter 调用）设置旋转速度
public void SetRotationSpeed(String message)
{
float value = float.Parse(message);
RotateAmount = new Vector3(value, value, value);
}
}
绑定脚本
UnityMessageManager.cs 是插件内置脚本
初始化 Flutter 项目
macOS 新建项目
flutter create demo_flutter_unity
Flutter 项目生成后，复制副本到 win10，作为 Unity 项目容器，用于生成 Flutter 依赖库
移动 Unity 项目 至 Flutter 项目
mkdir ./demo_flutter_unity/unity
cp -r ./demoFlutterUnity ./demo_flutter_unity/unity
Unity Player Settings
Android
IOS
无
导出 Android、IOS 依赖库
修改源码
// DoBuildAndroid()
// var options = BuildOptions.AcceptExternalModificationsToPlayer;
var options = BuildOptions.AllowDebugging;
EditorUserBuildSettings.exportAsGoogleAndroidProject = true;
// BuildIOS()
// var options = BuildOptions.AcceptExternalModificationsToPlayer;
var options = BuildOptions.AllowDebugging;
生成 unityLibrary 库
导出前，需要切换到对应的构建平台
Export Android：Android 依赖，导出到 android/unityLibrary
Export Android：IOS 依赖，导出到 ios/UnityLibrary
macOS 移动 Flutter 依赖库 至 macOS Flutter 项目
macOS Android 项目配置
android/settings.gradle
+ include ":unityLibrary"
+ project(":unityLibrary").projectDir = file("./unityLibrary")
android/build.gradle
allprojects {
repositories {
+ flatDir {
+ dirs "${project(':unityLibrary').projectDir}/libs"
+ }
}
}
android/app/build.gradle
android {
defaultConfig {
minSdkVersion xxx // xxx 需要 Unity Player Settings Android SDK 版本号一致
}
}
dependencies {
+ implementation project(':unityLibrary')
}
macOS IOS 项目配置
注意：正常情况下，按照该配置，构建 IOS 应用时，还会出现一些小问题，需要按照报错信息，自行解决（如：文件访问权限、CocoaPods 相关等等）
导入原生工程
导入、配置 Unity-iPhone 工程
配置 UnityFramework
配置团队、签名
单独构建 UnityFramework
macOS Flutter 项目编写
pubspec.yaml
dependencies:
+ flutter_unity_widget: ^4.1.0
lib/main.dart
import 'package:flutter/material.dart';
import 'package:flutter_unity_widget/flutter_unity_widget.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
static final GlobalKey<ScaffoldState> _scaffoldKey =
GlobalKey<ScaffoldState>();
late UnityWidgetController _unityWidgetController;
double _sliderValue = 0.0;
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
key: _scaffoldKey,
appBar: AppBar(
title: const Text('Flutter 与 Unity 通信'),
),
body: Card(
margin: const EdgeInsets.all(8),
clipBehavior: Clip.antiAlias,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20.0),
),
child: Stack(
children: <Widget>[
UnityWidget(
onUnityCreated: onUnityCreated,
onUnityMessage: onUnityMessage,
onUnitySceneLoaded: onUnitySceneLoaded,
fullscreen: false,
),
Positioned(
bottom: 20,
left: 20,
right: 20,
child: Card(
elevation: 10,
child: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 20),
child: Text("旋转速度"),
),
Slider(
onChanged: (value) {
setState(() {
_sliderValue = value;
});
setRotationSpeed(value.toString());
},
value: _sliderValue,
min: 0,
max: 20,
),
],
),
),
),
],
),
),
),
);
}
// Communcation from Flutter to Unity
void setRotationSpeed(String speed) {
_unityWidgetController.postMessage(
'Cube',
'SetRotationSpeed',
speed,
);
}
void onUnityMessage(message) {
print('Unity 消息推送: ${message.toString()}');
}
void onUnityCreated(controller) {
this._unityWidgetController = controller;
}
void onUnitySceneLoaded(SceneLoaded? sceneInfo) {
print('场景名称: ${sceneInfo!.name}');
print(
'场景编号: ${sceneInfo!.buildIndex}');
}
}
运行项目
flutter emulators
// apple_ios_simulator • iOS Simulator • Apple • ios
// Pixel_2_API_30 • Pixel 2 API 30 • Google • android
flutter emulators --launch apple_ios_simulator
flutter run
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