migrated pigeon example app

packages/pigeon/example/app/android/app/build.gradle

@@ -6,11 +6,6 @@ if (localPropertiesFile.exists()) {
     }
 }
 
-def flutterRoot = localProperties.getProperty('flutter.sdk')
-if (flutterRoot == null) {
-    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
-}
-
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
 if (flutterVersionCode == null) {
     flutterVersionCode = '1'
@@ -21,10 +16,6 @@ if (flutterVersionName == null) {
     flutterVersionName = '1.0'
 }
 
-apply plugin: 'com.android.application'
-apply plugin: 'kotlin-android'
-apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
-
 android {
     namespace "dev.flutter.pigeon_example_app"
     compileSdk flutter.compileSdkVersion
@@ -66,7 +57,3 @@ android {
 flutter {
     source '../..'
 }
-
-dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-}

packages/pigeon/example/app/android/build.gradle

@@ -1,16 +1,3 @@
-buildscript {
-    ext.kotlin_version = '1.9.0'
-    repositories {
-        google()
-        mavenCentral()
-    }
-
-    dependencies {
-        classpath 'com.android.tools.build:gradle:8.5.1'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-    }
-}
-
 allprojects {
     repositories {
         // See https://github.com/flutter/flutter/blob/master/docs/ecosystem/Plugins-and-Packages-repository-structure.md#gradle-structure for more info.

packages/pigeon/example/app/android/settings.gradle

@@ -1,24 +1,28 @@
-include ':app'
+pluginManagement {
+  def flutterSdkPath = {
+    def properties = new Properties()
+    file("local.properties").withInputStream { properties.load(it) }
+    def flutterSdkPath = properties.getProperty("flutter.sdk")
+    assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+    return flutterSdkPath
+  }()
 
-def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
-def properties = new Properties()
+  includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
 
-assert localPropertiesFile.exists()
-localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
-
-def flutterSdkPath = properties.getProperty("flutter.sdk")
-assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
-apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"
-
-// See https://github.com/flutter/flutter/blob/master/docs/ecosystem/Plugins-and-Packages-repository-structure.md#gradle-structure for more info.
-buildscript {
   repositories {
-    maven {
-      url "https://plugins.gradle.org/m2/"
-    }
-  }
-  dependencies {
-    classpath "gradle.plugin.com.google.cloud.artifactregistry:artifactregistry-gradle-plugin:2.2.1"
+    google()
+    mavenCentral()
+    gradlePluginPortal()
   }
 }
-apply plugin: "com.google.cloud.artifactregistry.gradle-plugin"
+
+// See https://github.com/flutter/flutter/blob/master/docs/ecosystem/Plugins-and-Packages-repository-structure.md#gradle-structure for more info.
+plugins {
+  id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+  id "com.android.application" version "8.5.1" apply false
+  id "org.jetbrains.kotlin.android" version "1.9.0" apply false
+  id "com.google.cloud.artifactregistry.gradle-plugin" version "2.2.1"
+
+}
+
+include ":app"