situm_flutter_unity

A Flutter plugin for embedding Unity projects in Flutter projects.

Both Android and iOS are supported.

Note

This is a fork of https://github.com/Glartek/flutter-unity.

Usage

To use this plugin, add situm_flutter_unity as a dependency in your pubspec.yaml file.

Example

Refer to the example project and the included Unity project.

Testing

To test this plugin, do the following:

  1. Run git clone https://github.com/situmtech/flutter-unity.git to create a local copy of flutter-unity.
  2. Open flutter-unity in Android Studio.

Android

  1. Connect your Android device and run the project.

iOS

  1. Configure the example project and the included Unity project.
  2. Connect your iOS device and run the project.

Configuring your Unity project

Android

  1. Go to File > Build Settings... to open the Build Settings window.
  2. Select Android and click Switch Platform.
  3. Click Add Open Scenes.
  4. Check Export Project.
  5. Click Player Settings... to open the Player Settings window.
  6. In the Player Settings window, configure the following:
Setting Value
Resolution and Presentation > Start in fullscreen mode No
Other Settings > Rendering > Graphics APIs OpenGLES3
Other Settings > Configuration > Scripting Backend IL2CPP
Other Settings > Configuration > Target Architectures ARMv7, ARM64
  1. Close the Player Settings window.
  2. Click Export and save as unityExport.

iOS

  1. Go to File > Build Settings... to open the Build Settings window.
  2. Select iOS and click Switch Platform.
  3. Click Add Open Scenes.
  4. Click Build and save as UnityProject.

Configuring your Flutter project

Android

  1. Copy the unityExport folder to <your_flutter_project>/android/unityExport.
  2. Run flutter pub run situm_flutter_unity:unity_export_transmogrify.
  3. Open <your_flutter_project>/android/unityExport/build.gradle and check if buildTypes { profile {} } is present. If not, add the following:
buildTypes {
    profile {}
}

Refer to the example project's unityExport/build.gradle.

  1. Open <your_flutter_project>/android/build.gradle and, under allprojects { repositories {} }, add the following:
flatDir {
    dirs "${project(':unityExport').projectDir}/libs"
}

Refer to the example project's build.gradle.

  1. Open <your_flutter_project>/android/settings.gradle and add the following:
include ':unityExport'

Refer to the example project's settings.gradle.

  1. Open <your_flutter_project>/android/app/src/main/AndroidManifest.xml and add the following:
<uses-permission android:name="android.permission.WAKE_LOCK"/>

Refer to the example project's AndroidManifest.xml.

Steps 1, 2 and 3 must be repeated for every new build of the Unity project.

iOS

  1. Copy the UnityProject folder to <your_flutter_project>/ios/UnityProject and open <your_flutter_project>/ios/Runner.xcworkspace in Xcode.
  2. Go to File > Add Files to "Runner"..., and add <your_flutter_project>/ios/UnityProject/Unity-iPhone.xcodeproj.
  3. Select Unity-iPhone/Data, and, in the Inspectors pane, set the Target Membership to UnityFramework.
  4. Select Unity-iPhone, select PROJECT : Unity-iPhone, and, in the Build Settings tab, configure the following:
Setting Value
Build Options > Enable Bitcode No
Linking > Other Linker Flags -Wl,-U,_FlutterUnityPluginOnMessage
  1. Select Runner, select TARGETS : Runner, and, in the General tab, configure the following:
Setting Value
Frameworks, Libraries, and Embedded Content
Name Embed
UnityFramework.framework Embed & Sign
  1. Select Runner/Runner/Info.plist, and configure the following:
Key Type Value
io.flutter.embedded_views_preview Boolean YES

Steps 1, 3 and 4 must be repeated for every new build of the Unity project.

Exchanging messages between Flutter and Unity

Flutter

To send a message, define the onCreated callback in your UnityView widget, and use the send method from the received controller.

To receive a message, define the onMessage callback in your UnityView widget.

Unity

To send and receive messages, include FlutterUnityPlugin.cs in your project, and use the Messages.Send and Messages.Receive methods.

A Message object has the following members:

  • id (int)

A non-negative number representing the source view when receiving a message, and the destination view when sending a message. When sending a message, it can also be set to a negative number, indicating that the message is intended for any existing view.

  • data (string)

The actual message.

Refer to the included Unity project's Rotate.cs.

Libraries

flutter_unity