ci: add AGP9 compatibility checks in CI

Author: Lyokone

.github/workflows/android.yaml

@@ -143,3 +143,29 @@ jobs:
           path: |
             ~/.android/avd/*
             ~/.android/adb*
+
+  agp9-compatibility:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938
+      - uses: actions/setup-java@8df1039502a15bceb9433410b1a100fbe190c53b
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+      - uses: subosito/flutter-action@f2c4f6686ca8e8d6e6d0f28410eeef506ed66aff
+        with:
+          channel: 'stable'
+          cache: true
+          cache-key: "flutter-:os:-:channel:-:version:-:arch:-:hash:"
+          pub-cache-key: "flutter-pub-:os:-:channel:-:version:-:arch:-:hash:"
+      - uses: bluefireteam/melos-action@705015c3d2bc4ab94201ac24accb2bbe070cf533
+        with:
+          run-bootstrap: false
+          melos-version: '5.3.0'
+      - name: 'Bootstrap tests package'
+        run: melos bootstrap --scope tests
+      - name: Gradle cache
+        uses: gradle/actions/setup-gradle@v4
+      - name: 'Build tests app with AGP 9'
+        run: bash ./.github/workflows/scripts/agp9-compatibility.sh

.github/workflows/scripts/agp9-compatibility.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+set -euo pipefail
+
+AGP_VERSION="${AGP_VERSION:-9.0.1}"
+GRADLE_VERSION="${GRADLE_VERSION:-9.1.0}"
+
+TEST_ANDROID_DIR="tests/android"
+
+perl -0pi -e "s/id \"com\.android\.application\" version \"[^\"]+\" apply false/id \"com.android.application\" version \"$AGP_VERSION\" apply false/" \
+  "$TEST_ANDROID_DIR/settings.gradle"
+
+perl -0pi -e "s#distributionUrl=https\\\\://services.gradle.org/distributions/gradle-[^-]+-all.zip#distributionUrl=https\\\\://services.gradle.org/distributions/gradle-$GRADLE_VERSION-all.zip#" \
+  "$TEST_ANDROID_DIR/gradle/wrapper/gradle-wrapper.properties"
+
+# AGP 9 has built-in Kotlin support. Keep the compatibility check focused on
+# FlutterFire plugins by applying the same migration to the test app at runtime.
+perl -0pi -e 's/\n\s*id "kotlin-android"\n/\n/' "$TEST_ANDROID_DIR/app/build.gradle"
+perl -0pi -e 's/\n\s*kotlinOptions \{\n\s*jvmTarget = JavaVersion\.VERSION_17\n\s*\}\n/\n/' "$TEST_ANDROID_DIR/app/build.gradle"
+
+grep -q "id \"com.android.application\" version \"$AGP_VERSION\" apply false" "$TEST_ANDROID_DIR/settings.gradle"
+grep -q "gradle-$GRADLE_VERSION-all.zip" "$TEST_ANDROID_DIR/gradle/wrapper/gradle-wrapper.properties"
+! grep -q 'id "kotlin-android"' "$TEST_ANDROID_DIR/app/build.gradle"
+! grep -q 'kotlinOptions' "$TEST_ANDROID_DIR/app/build.gradle"
+
+cd tests
+flutter build apk --debug --dart-define=CI=true --no-android-gradle-daemon