fix: support AGP 9 built-in Kotlin

.github/workflows/android-compatibility.yml

@@ -0,0 +1,59 @@
+name: Android compatibility
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+concurrency:
+  group: android-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: agp-9-compatibility
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+          flutter-version: 3.47.4
+          cache: true
+
+      - name: Install package dependencies
+        run: flutter pub get
+
+      - name: Analyze package
+        run: flutter analyze
+
+      - name: Run Dart tests
+        run: flutter test
+
+      - name: Install example dependencies
+        working-directory: example
+        run: flutter pub get
+
+      - name: Build complete example in KGP compatibility mode
+        working-directory: example
+        run: flutter build apk --debug
+
+      - name: Run Android plugin tests and lint
+        working-directory: example/android
+        run: ./gradlew :v_video_compressor:testDebugUnitTest lintDebug
+
+      - name: Verify AGP 9 built-in Kotlin integration
+        env:
+          # Flutter 3.47.4 incorrectly validates AGP's bundled Kotlin as if it
+          # were an independently upgradeable KGP version. Remove this override
+          # after https://github.com/flutter/flutter/issues/192167 is fixed.
+          FLUTTER_ANDROID_SKIP_BUILD_DEPENDENCY_VALIDATION: "true"
+        run: tool/verify_android_built_in_kotlin.sh

CHANGELOG.md

@@ -1,5 +1,12 @@
 ## [Unreleased]
 
+### Changed
+
+- Migrated the Android plugin away from applying KGP so it supports AGP 9
+  built-in Kotlin, fixing #25. This raises the minimum supported toolchain to
+  Flutter 3.44 and Dart 3.12; enabling built-in Kotlin in an app requires
+  Flutter 3.47 or newer.
+
 ### Fixed
 
 - Android H.264 exports now request the lowest H.264 level that covers the

README.md

@@ -32,6 +32,10 @@ This plugin **focuses exclusively on video compression and thumbnail generation*
 | **iOS (SwiftPM)**    | ✅ **Full Support** | iOS 15.0+              | Current Flutter toolchains         |
 | **iOS (CocoaPods)**  | ✅ **Full Support** | iOS 12.0+              | Legacy Flutter toolchain metadata  |
 
+The package requires Flutter 3.44 or newer and Dart 3.12 or newer. Android
+apps can use either Flutter's legacy KGP compatibility mode or AGP 9 built-in
+Kotlin; enabling built-in Kotlin requires Flutter 3.47 or newer.
+
 ## 🚀 **Quick Start**
 
 ### 1. Installation

android/build.gradle

@@ -22,7 +22,12 @@ allprojects {
 }
 
 apply plugin: "com.android.library"
-apply plugin: "kotlin-android"
+
+kotlin {
+    compilerOptions {
+        jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_11
+    }
+}
 
 android {
     namespace = "com.v_chat_sdk.v_video_compressor"
@@ -34,15 +39,6 @@ android {
         targetCompatibility = JavaVersion.VERSION_11
     }
 
-    kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_11
-    }
-
-    sourceSets {
-        main.java.srcDirs += "src/main/kotlin"
-        test.java.srcDirs += "src/test/kotlin"
-    }
-
     defaultConfig {
         minSdk = 21
     }

example/pubspec.lock

@@ -411,10 +411,10 @@ packages:
     dependency: transitive
     description:
       name: matcher
-      sha256: dc0b7dc7651697ea4ff3e69ef44b0407ea32c487a39fff6a4004fa585e901861
+      sha256: "31bd099b47c10cd1aeb55146a2d46ce0277630ecef3f7dae54ad7873f36696cd"
       url: "https://pub.dev"
     source: hosted
-    version: "0.12.19"
+    version: "0.12.20"
   material_color_utilities:
     dependency: transitive
     description:
@@ -427,10 +427,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: "1741988757a65eb6b36abe716829688cf01910bbf91c34354ff7ec1c3de2b349"
+      sha256: "307249ce4ff29d58a18e97f6345f539382eb9c9c29ecda628900f31de0443dd9"
       url: "https://pub.dev"
     source: hosted
-    version: "1.18.0"
+    version: "1.19.0"
   mime:
     dependency: transitive
     description:
@@ -624,10 +624,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: "949a932224383300f01be9221c39180316445ecb8e7547f70a41a35bf421fb9e"
+      sha256: "2a122cbe059f8b610d3a5415f42e255b6c17b1f21eee1d960f31080237fb4f11"
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.11"
+    version: "0.7.12"
   transparent_image:
     dependency: transitive
     description:
@@ -655,10 +655,10 @@ packages:
     dependency: transitive
     description:
       name: vector_math
-      sha256: d530bd74fea330e6e364cda7a85019c434070188383e1cd8d9777ee586914c5b
+      sha256: f36f9f3be64c6198714492bb455c11056e33e2f85d9a0b676a48301e44fdcf47
       url: "https://pub.dev"
     source: hosted
-    version: "2.2.0"
+    version: "2.4.2"
   video_player:
     dependency: transitive
     description:

example/pubspec.yaml

@@ -5,7 +5,7 @@ description: "Demonstrates how to use the v_video_compressor plugin."
 publish_to: "none" # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 environment:
-  sdk: ^3.8.1
+  sdk: ^3.12.0
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions

pubspec.yaml

@@ -6,8 +6,8 @@ repository: https://github.com/v-chat-sdk/v_video_compressor
 issue_tracker: https://github.com/v-chat-sdk/v_video_compressor/issues
 
 environment:
-  sdk: ">=3.2.0 <4.0.0"
-  flutter: ">=3.3.0"
+  sdk: ^3.12.0
+  flutter: ">=3.44.0"
 
 dependencies:
   flutter:

tool/verify_android_built_in_kotlin.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+flutter_bin="${FLUTTER_BIN:-flutter}"
+fixture_parent="$(mktemp -d "${TMPDIR:-/tmp}/vvc-built-in-kotlin.XXXXXX")"
+fixture_dir="$fixture_parent/app"
+
+cleanup() {
+  rm -rf "$fixture_parent"
+}
+trap cleanup EXIT
+
+"$flutter_bin" create \
+  --empty \
+  --org com.v_chat_sdk \
+  --platforms android \
+  --project-name vvc_built_in_kotlin \
+  "$fixture_dir"
+
+(
+  cd "$fixture_dir"
+  "$flutter_bin" pub add "v_video_compressor@{path: $repo_root}"
+
+  sed -i.bak '/org.jetbrains.kotlin.android/d' android/settings.gradle.kts
+  rm android/settings.gradle.kts.bak
+  sed -i.bak \
+    's/android.builtInKotlin=false/android.builtInKotlin=true/' \
+    android/gradle.properties
+  rm android/gradle.properties.bak
+
+  grep -Fq 'android.builtInKotlin=true' android/gradle.properties
+  if grep -Eq 'kotlin-android|org.jetbrains.kotlin.android' \
+    android/settings.gradle.kts android/app/build.gradle.kts; then
+    echo 'The built-in Kotlin fixture still applies KGP.' >&2
+    exit 1
+  fi
+
+  build_args=(build apk --debug)
+  if [[ "${FLUTTER_ANDROID_SKIP_BUILD_DEPENDENCY_VALIDATION:-false}" == "true" ]]; then
+    build_args+=(--android-skip-build-dependency-validation)
+  fi
+  "$flutter_bin" "${build_args[@]}"
+)