Update build.cs for Unity 6000.

Author: timbotimbo

example/unity/DemoApp/Assets/FlutterUnityIntegration/Editor/Build.cs

@@ -208,14 +208,22 @@ private static void DoBuildAndroid(String buildPath, bool isPlugin, bool isRelea
                 // remove this line if you don't use a debugger and you want to speed up the flutter build
                 playerOptions.options = BuildOptions.AllowDebugging | BuildOptions.Development;
             }
-            #if UNITY_2022_1_OR_NEWER
+            #if UNITY_6000_0_OR_NEWER
+                PlayerSettings.SetIl2CppCompilerConfiguration(UnityEditor.Build.NamedBuildTarget.Android, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
+                PlayerSettings.SetIl2CppCodeGeneration(UnityEditor.Build.NamedBuildTarget.Android, UnityEditor.Build.Il2CppCodeGeneration.OptimizeSize);
+            #elif UNITY_2022_1_OR_NEWER
                 PlayerSettings.SetIl2CppCompilerConfiguration(BuildTargetGroup.Android, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
                 PlayerSettings.SetIl2CppCodeGeneration(UnityEditor.Build.NamedBuildTarget.Android, UnityEditor.Build.Il2CppCodeGeneration.OptimizeSize);
             #elif UNITY_2021_2_OR_NEWER
                 PlayerSettings.SetIl2CppCompilerConfiguration(BuildTargetGroup.Android, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
                 EditorUserBuildSettings.il2CppCodeGeneration = UnityEditor.Build.Il2CppCodeGeneration.OptimizeSize;
             #endif
 
+
+#if UNITY_ANDROID && UNITY_6000_0_OR_NEWER
+            UnityEditor.Android.UserBuildSettings.DebugSymbols.level = isReleaseBuild ? Unity.Android.Types.DebugSymbolLevel.None : Unity.Android.Types.DebugSymbolLevel.SymbolTable;
+            UnityEditor.Android.UserBuildSettings.DebugSymbols.format = Unity.Android.Types.DebugSymbolFormat.LegacyExtensions;
+#endif
             // Switch to Android standalone build.
             EditorUserBuildSettings.SwitchActiveBuildTarget(BuildTargetGroup.Android, BuildTarget.Android);
             // build addressable
@@ -227,6 +235,13 @@ private static void DoBuildAndroid(String buildPath, bool isPlugin, bool isRelea
 
             Copy(buildPath, AndroidExportPath);
 
+            // Unity 6000 shared folder
+            string sharedPath = Path.Combine(APKPath, "shared");
+            if (Directory.Exists(sharedPath)) 
+            {
+                Copy(sharedPath, Path.Combine(AndroidExportPath, "shared"));
+            }
+
             // Modify build.gradle
             ModifyAndroidGradle(isPlugin);
 
@@ -332,6 +347,10 @@ private static void ModifyAndroidGradle(bool isPlugin)
             buildText = buildText.Replace(" + unityStreamingAssets.tokenize(', ')", "");
             buildText = Regex.Replace(buildText, "ndkPath \".*\"", "");
 
+            // Untiy 6000, handle ../shared/
+            buildText = Regex.Replace(buildText, @"\.\./shared/", "./shared/");
+            
+
             // check for namespace definition (Android gradle plugin 8+), add a backwards compatible version if it is missing.
             if(!buildText.Contains("namespace")) 
             {
@@ -404,7 +423,10 @@ private static void BuildIOS(String path, bool isReleaseBuild)
                 EditorUserBuildSettings.iOSBuildConfigType = iOSBuildType.Release;
             #endif
 
-            #if UNITY_2022_1_OR_NEWER
+            #if UNITY_6000_0_OR_NEWER
+                PlayerSettings.SetIl2CppCompilerConfiguration(UnityEditor.Build.NamedBuildTarget.Android, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
+                PlayerSettings.SetIl2CppCodeGeneration(UnityEditor.Build.NamedBuildTarget.Android, UnityEditor.Build.Il2CppCodeGeneration.OptimizeSize);
+            #elif UNITY_2022_1_OR_NEWER
                 PlayerSettings.SetIl2CppCompilerConfiguration(BuildTargetGroup.iOS, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
                 PlayerSettings.SetIl2CppCodeGeneration(UnityEditor.Build.NamedBuildTarget.iOS, UnityEditor.Build.Il2CppCodeGeneration.OptimizeSize);
             #elif UNITY_2021_2_OR_NEWER