build: migrate build.gradle to Kotlin DSL

AnkiDroid/proguard-rules.pro

@@ -1,6 +1,6 @@
 # Add project specific ProGuard rules here.
 # You can control the set of applied configuration files using the
-# proguardFiles setting in build.gradle.
+# proguardFiles setting in build.gradle.kts.
 #
 # For more details, see
 #   http://developer.android.com/guide/developing/tools/proguard.html

AnkiDroid/src/androidTest/java/com/ichi2/testutils/NewCollectionPathTestRunner.kt

@@ -24,7 +24,7 @@ import androidx.test.runner.AndroidJUnitRunner
  * A test runner which sets [com.ichi2.anki.AnkiDroidApp.INSTRUMENTATION_TESTING] to true
  * so a test collection path is used
  */
-@Suppress("unused") // referenced by build.gradle
+@Suppress("unused") // referenced by build.gradle.kts
 class NewCollectionPathTestRunner : AndroidJUnitRunner() {
     override fun newApplication(
         cl: ClassLoader?,

buildSrc/src/main/kotlin/ankidroid.android.app.gradle.kts

@@ -0,0 +1,47 @@
+/*
+ *  Copyright (c) 2026 David Allison <davidallisongithub@gmail.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation; either version 3 of the License, or (at your option) any later
+ *  version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ *  PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ Convention plugin: applies `com.android.application` plus Kotlin Parcelize,
+ and pins the settings shared with every other Android module
+ (compileSdk, minSdk, Java 17). Mirrors `ankidroid.android.library`.
+ */
+
+import com.android.build.api.dsl.ApplicationExtension
+import com.ichi2.anki.gradle.libsVersionFor
+
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.plugin.parcelize")
+}
+
+extensions.configure<ApplicationExtension> {
+    compileSdk = libsVersionFor("compileSdk").toInt()
+
+    defaultConfig {
+        minSdk = libsVersionFor("minSdk").toInt()
+        // After #13695: change .tests_emulator.yml
+        targetSdk = libsVersionFor("targetSdk").toInt()
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+}
+
+// Shared project-wide lint configuration.
+apply(from = "${rootDir}/lint.gradle")

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ compileSdk = "36"
 
 # Changing minSdk means newer AnkiDroid versions will not support older devices.
 # However the Play Store will keep old AnkiDroid versions available for older
-# devices *if* you also change AnkiDroid/build.gradle play { retain {} } block
+# devices *if* you also change AnkiDroid/build.gradle.kts play { retain {} } block
 # to include the version codes of the last released version for the older
 # minSdk. It is critical to update those version codes when you change this.
 minSdk = "24"

tools/release.sh

@@ -31,16 +31,16 @@ if [ "$PUBLIC" = "public" ] && ! [ -f ../ankidroiddocs/changelog.asc ]; then
 fi
 
 # Captured once so every APK in this release reports the same BUILD_TIME
-# (consumed by AnkiDroid/build.gradle via -PbuildTime).
+# (consumed by AnkiDroid/build.gradle.kts via -PbuildTime).
 BUILD_TIME_MS=$(date +%s000)
 export BUILD_TIME_MS
 
 # Define the location of the manifest file
 SRC_DIR="./AnkiDroid"
-GRADLEFILE="$SRC_DIR/build.gradle"
+GRADLEFILE="$SRC_DIR/build.gradle.kts"
 CHANGELOG="$SRC_DIR/src/main/assets/changelog.html"
 
-if ! VERSION=$(grep 'versionName=' $GRADLEFILE | sed -e 's/.*="//' | sed -e 's/".*//')
+if ! VERSION=$(grep 'versionName =' $GRADLEFILE | sed -e 's/.*"\(.*\)".*/\1/')
 then
   echo "Unable to get current version. Is sed installed?"
   exit 1
@@ -87,13 +87,13 @@ if [ "$PUBLIC" != "public" ]; then
   # Increment version code
   # It is an integer in AndroidManifest that nobody actually sees.
   # Ex: 72 to 73
-  PREVIOUS_CODE=$(grep 'versionCode=' $GRADLEFILE | sed -e 's/.*=//')
+  PREVIOUS_CODE=$(grep 'versionCode =' $GRADLEFILE | sed -e 's/.*= //')
   GUESSED_CODE=$((PREVIOUS_CODE + 1))
 
   # Edit AndroidManifest.xml to bump version string
   echo "Bumping version from $PREVIOUS_VERSION$SUFFIX to $VERSION (and code from $PREVIOUS_CODE to $GUESSED_CODE)"
   sed -i -e s/"$PREVIOUS_VERSION""$SUFFIX"/"$VERSION"/g $GRADLEFILE
-  sed -i -e s/versionCode="$PREVIOUS_CODE"/versionCode="$GUESSED_CODE"/g $GRADLEFILE
+  sed -i -e "s/versionCode = $PREVIOUS_CODE/versionCode = $GUESSED_CODE/g" $GRADLEFILE
 fi
 
 # If any changes go in during the release process, pushing fails, so push immediately.