Example cleanup & improve gradle compatibility.

example/android/app/build.gradle

@@ -26,7 +26,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
- compileSdkVersion 31
+ compileSdkVersion 33
 
  sourceSets {
  main.java.srcDirs += 'src/main/kotlin'
@@ -40,7 +40,7 @@ android {
  // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
  applicationId "com.xraph.plugin.flutter_unity_widget_example"
  minSdkVersion 28
- targetSdkVersion 31
+ targetSdkVersion 33
  versionCode flutterVersionCode.toInteger()
  versionName flutterVersionName
  }

example/android/build.gradle

@@ -1,12 +1,12 @@
 buildscript {
- ext.kotlin_version = '1.6.10'
+ ext.kotlin_version = '1.7.10'
  repositories {
  google()
- jcenter()
+ mavenCentral()
  }
 
  dependencies {
- classpath 'com.android.tools.build:gradle:4.1.0'
+ classpath 'com.android.tools.build:gradle:7.3.0'
  classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
  }
 }
@@ -19,7 +19,7 @@ allprojects {
  }
 
  google()
- jcenter()
+ mavenCentral()
  }
 }
 

example/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip

example/lib/menu_screen.dart

@@ -35,11 +35,6 @@ class _MenuScreenState extends State<MenuScreen> {
  route: '/orientation',
  description: 'test orientation change',
  ),
- _MenuListItem(
- description: 'Unity native activity demo',
- route: '/activity',
- title: 'Native Activity Demo ',
- ),
  ];
 
  @override