update kotlin version handling in android build scripts for CI compatibility

buenaflor · buenaflor · commit f2cb379d950c · 2026-01-08T14:14:07.000+01:00
diff --git a/.github/workflows/kotlin-version-compatibility.yml b/.github/workflows/kotlin-version-compatibility.yml
@@ -0,0 +1,61 @@
+name: Kotlin Version Compatibility
+
+on:
+  push:
+    branches:
+      - main
+      - release/**
+  pull_request:
+    paths:
+      - ".github/workflows/kotlin-version-compatibility.yml"
+      - "packages/flutter/android/**"
+      - "packages/flutter/example/android/**"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  build-apk-kotlin-versions:
+    name: "APK | Kotlin lang ${{ matrix.kotlin_language_version }}"
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    defaults:
+      run:
+        working-directory: packages/flutter/example
+    strategy:
+      fail-fast: false
+      matrix:
+        kotlin_language_version: ["1.7", "2.0", "2.3.0"]
+
+    env:
+      KOTLIN_LANGUAGE_VERSION: ${{ matrix.kotlin_language_version }}
+
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: "temurin"
+          java-version: "17"
+
+      - uses: subosito/flutter-action@fd55f4c5af5b953cc57a2be44cb082c8f6635e8e # pin@v2.21.0
+        with:
+          channel: stable
+
+      - name: Flutter pub get
+        run: flutter pub get
+
+      - name: Build APK with Kotlin language version ${{ matrix.kotlin_language_version }}
+        run: flutter build apk --debug --target-platform=android-x64
+
+      - name: Verify build artifacts
+        run: |
+          if [ -f "build/app/outputs/flutter-apk/app-debug.apk" ]; then
+            echo "APK build successful with Kotlin language version ${{ matrix.kotlin_language_version }}"
+            ls -lh build/app/outputs/flutter-apk/app-debug.apk
+          else
+            echo "APK build failed - artifact not found"
+            exit 1
+          fi
diff --git a/packages/flutter/android/build.gradle b/packages/flutter/android/build.gradle
@@ -58,7 +58,6 @@ android {
     }
     kotlinOptions {
         jvmTarget = JavaVersion.VERSION_1_8
-        languageVersion = "1.8"
     }
 }
 
diff --git a/packages/flutter/example/android/app/build.gradle b/packages/flutter/example/android/app/build.gradle
@@ -34,7 +34,11 @@ android {
     }
     kotlinOptions {
         jvmTarget = JavaVersion.VERSION_1_8
-        languageVersion = "1.8"
+        // Allow CI to override Kotlin language version for compatibility testing
+        def kotlinLanguageVersion = System.getenv("KOTLIN_LANGUAGE_VERSION")
+        if (kotlinLanguageVersion != null) {
+            languageVersion = kotlinLanguageVersion
+        }
     }
 
     compileSdkVersion 35

Original file line number	Diff line number	Diff line change
`@@ -58,7 +58,6 @@ android {`
`58`	`58`	`}`
`59`	`59`	`kotlinOptions {`
`60`	`60`	`jvmTarget = JavaVersion.VERSION_1_8`
`61`		`- languageVersion = "1.8"`
`62`	`61`	`}`
`63`	`62`	`}`
`64`	`63`
Original file line number	Diff line number	Diff line change
`@@ -34,7 +34,11 @@ android {`
`34`	`34`	`}`
`35`	`35`	`kotlinOptions {`
`36`	`36`	`jvmTarget = JavaVersion.VERSION_1_8`
`37`		`- languageVersion = "1.8"`
	`37`	`+ // Allow CI to override Kotlin language version for compatibility testing`
	`38`	`+ def kotlinLanguageVersion = System.getenv("KOTLIN_LANGUAGE_VERSION")`
	`39`	`+ if (kotlinLanguageVersion != null) {`
	`40`	`+ languageVersion = kotlinLanguageVersion`
	`41`	`+ }`
`38`	`42`	`}`
`39`	`43`
`40`	`44`	`compileSdkVersion 35`