example: upgrade to declarative Gradle buildfiles

Author: bartekpacia

example/android/app/build.gradle

@@ -1,3 +1,9 @@
+plugins {
+    id "com.android.application"
+    id "org.jetbrains.kotlin.android"
+    id "dev.flutter.flutter-gradle-plugin"
+}
+
 def localProperties = new Properties()
 def localPropertiesFile = rootProject.file("local.properties")
 if (localPropertiesFile.exists()) {
@@ -6,11 +12,6 @@ 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"
@@ -21,21 +22,17 @@ 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 {
-    compileSdk 34
-
-    namespace "vn.hunghd.example"
+    namespace = "vn.hunghd.example"
+    compileSdk = 34
+    ndkVersion = flutter.ndkVersion
 
     defaultConfig {
         applicationId "vn.hunghd.example"
-        minSdk 19
-        targetSdk 33
-        versionCode flutterVersionCode.toInteger()
-        versionName flutterVersionName
+        minSdk = 21
+        targetSdk = 34
+        versionCode = flutterVersionCode.toInteger()
+        versionName = flutterVersionName
     }
 
     buildTypes {

example/android/build.gradle

@@ -1,23 +1,3 @@
-buildscript {
-    ext.kotlin_version = "1.7.22"
-    repositories {
-        google()
-        mavenCentral()
-    }
-
-    dependencies {
-        classpath "com.android.tools.build:gradle:7.4.2"
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-    }
-}
-
-allprojects {
-    repositories {
-        google()
-        mavenCentral()
-    }
-}
-
 rootProject.buildDir = "../build"
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
@@ -27,5 +7,5 @@ subprojects {
 }
 
 tasks.register("clean", Delete) {
-    delete rootProject.buildDir
+    delete(rootProject.buildDir)
 }

example/android/settings.gradle

@@ -1,15 +1,25 @@
-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 flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
 
-def plugins = new Properties()
-def pluginsFile = new File(flutterProjectRoot.toFile(), ".flutter-plugins")
-if (pluginsFile.exists()) {
-    pluginsFile.withReader("UTF-8") { reader -> plugins.load(reader) }
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
 }
 
-plugins.each { name, path ->
-    def pluginDirectory = flutterProjectRoot.resolve(path).resolve("android").toFile()
-    include ":$name"
-    project(":$name").projectDir = pluginDirectory
+plugins {
+    id("dev.flutter.flutter-plugin-loader")
+    id("com.android.application") version ("8.3.1") apply false
+    id("org.jetbrains.kotlin.android") version ("1.9.23") apply false
 }
+
+include(":app")