Updated Android sample to showcase "Flutter to Unity" and "Unity to Flutter" functionality

example/android/app/build.gradle

@@ -25,7 +25,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 28
 
     lintOptions {
         disable 'InvalidPackage'
@@ -34,8 +34,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.rexraphael.flutterunitywidgetexample"
-        minSdkVersion 16
-        targetSdkVersion 27
+        minSdkVersion 19
+        targetSdkVersion 28
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

example/android/gradle.properties

@@ -1 +1,2 @@
 org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true

example/lib/main.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'dart:async';
 import 'package:flutter_unity_widget/flutter_unity_widget.dart';
 
 void main() => runApp(MyApp());
@@ -13,7 +12,7 @@ class _MyAppState extends State<MyApp> {
   static final GlobalKey<ScaffoldState> _scaffoldKey =
       GlobalKey<ScaffoldState>();
   UnityWidgetController _unityWidgetController;
-  bool paused = false;
+  double _sliderValue = 0.0;
 
   @override
   void initState() {
@@ -28,41 +27,65 @@ class _MyAppState extends State<MyApp> {
         appBar: AppBar(
           title: const Text('Unity Flutter Demo'),
         ),
-        body: Container(
-            child: Stack(
-          children: <Widget>[
-            UnityWidget(
-              onUnityViewCreated: onUnityCreated,
-            ),
-            Positioned(
-              bottom: 40.0,
-              left: 80.0,
-              right: 80.0,
-              child: MaterialButton(
-                onPressed: () {
-
-                  if(paused) {
-                    _unityWidgetController.resume();
-                    setState(() {
-                      paused = false;
-                    });
-                  } else {
-                    _unityWidgetController.pause();
-                    setState(() {
-                      paused = true;
-                    });
-                  }
-                },
-                color: Colors.blue[500],
-                child: Text(paused ? 'Start Game' : 'Pause Game'),
+        body: Card(
+          margin: const EdgeInsets.all(8),
+          clipBehavior: Clip.antiAlias,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(20.0),
+          ),
+          child: Stack(
+            children: <Widget>[
+              UnityWidget(
+                onUnityViewCreated: onUnityCreated,
+                isARScene: false,
+                onUnityMessage: onUnityMessage,
               ),
-            ),
-          ],
-        )),
+              Positioned(
+                bottom: 20,
+                left: 20,
+                right: 20,
+                child: Card(
+                  elevation: 10,
+                  child: Column(
+                    children: <Widget>[
+                      Padding(
+                        padding: const EdgeInsets.only(top: 20),
+                        child: Text("Rotation speed:"),
+                      ),
+                      Slider(
+                        onChanged: (value) {
+                          setState(() {
+                            _sliderValue = value;
+                          });
+                          setRotationSpeed(value.toString());
+                        },
+                        value: _sliderValue,
+                        min: 0,
+                        max: 20,
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ),
       ),
     );
   }
 
+  void setRotationSpeed(String speed) {
+    _unityWidgetController.postMessage(
+      'Cube',
+      'SetRotationSpeed',
+      speed,
+    );
+  }
+
+  void onUnityMessage(controller, message) {
+    print('Received message from unity: ${message.toString()}');
+  }
+
   // Callback that connects the created controller to the unity controller
   void onUnityCreated(controller) {
     this._unityWidgetController = controller;

example/unity/DemoApp/Assets/Rotate.cs

@@ -1,8 +1,8 @@
-using System.Collections;
-using System.Collections.Generic;
+using System;
 using UnityEngine;
+using UnityEngine.EventSystems;
 
-public class Rotate : MonoBehaviour
+public class Rotate : MonoBehaviour, IEventSystemHandler
 {
     [SerializeField]
     Vector3 RotateAmount;
@@ -10,12 +10,35 @@ public class Rotate : MonoBehaviour
     // Start is called before the first frame update
     void Start()
     {
-        RotateAmount = new Vector3(10, 10, 10);
+        RotateAmount = new Vector3(0, 0, 0);
     }
 
     // Update is called once per frame
     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))
+                {
+                    // This method is used to send data to Flutter
+                    UnityMessageManager.Instance.SendMessageToFlutter("The cube feels touched.");
+                }
+            }
+        }
+    }
+
+    // This method is called from Flutter
+    public void SetRotationSpeed(String message)
+    {
+        float value = float.Parse(message);
+        RotateAmount = new Vector3(value, value, value);
     }
 }

example/unity/DemoApp/ProjectSettings/ProjectVersion.txt

@@ -1 +1,2 @@
-m_EditorVersion: 2018.3.9f1
+m_EditorVersion: 2019.3.0a8
+m_EditorVersionWithRevision: 2019.3.0a8 (8ea4afdbfa47)