Android: Downgrade build dependencies and SDK versions

- Revert Android Gradle plugin from 8.8.1 to 8.1.2
- Downgrade Kotlin version from 2.1.20-RC to 1.9.20
- Lower Java/JVM target from 21 to 17
- Reduce CMake version from 3.31.5 to 3.22.1
- Update various Android dependencies to stable versions:
  - Navigation Safe Args plugin to 2.6.0
  - ktlint to 0.47.1
  - Play Publisher plugin to 3.8.6
- Remove custom APK naming scheme
- Fix CMake boolean arguments (OFF -> 0)
- Remove citron copyright header

2 files changed, 27 insertions, 36 deletions

diff --git a/src/android/app/build.gradle.kts b/src/android/app/build.gradle.kts
index 35871c3c9..c71cc5536 100644
--- a/src/android/app/build.gradle.kts
+++ b/src/android/app/build.gradle.kts
@@ -11,10 +11,10 @@ plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
     id("kotlin-parcelize")
-    kotlin("plugin.serialization") version "2.1.20-RC"
+    kotlin("plugin.serialization") version "1.9.20"
     id("androidx.navigation.safeargs.kotlin")
-    id("org.jlleitschuh.gradle.ktlint") version "12.1.2"
-    id("com.github.triplet.play") version "3.12.1"
+    id("org.jlleitschuh.gradle.ktlint") version "11.4.0"
+    id("com.github.triplet.play") version "3.8.6"
 }
 
 /**
@@ -29,19 +29,19 @@ android {
     namespace = "org.citron.citron_emu"
 
     compileSdkVersion = "android-35"
-    ndkVersion = "28.0.13004108" // "27.2.12479018" // "26.1.10909125"
+    ndkVersion = "26.1.10909125"
 
     buildFeatures {
         viewBinding = true
     }
 
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_21
-        targetCompatibility = JavaVersion.VERSION_21
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     kotlinOptions {
-        jvmTarget = "21"
+        jvmTarget = "17"
     }
 
     packaging {
@@ -76,15 +76,6 @@ android {
         buildConfigField("String", "BRANCH", "\"${getBranch()}\"")
     }
 
-    android.applicationVariants.all {
-        val variant = this
-        variant.outputs.all {
-            if (this is com.android.build.gradle.internal.api.ApkVariantOutputImpl) {
-                outputFileName = "Citron-${variant.versionName}-${variant.name}.apk"
-            }
-        }
-    }
-
     val keystoreFile = System.getenv("ANDROID_KEYSTORE_FILE")
     signingConfigs {
         if (keystoreFile != null) {
@@ -170,7 +161,7 @@ android {
 
     externalNativeBuild {
         cmake {
-            version = "3.31.5"
+            version = "3.22.1"
             path = file("../../../CMakeLists.txt")
         }
     }
@@ -179,9 +170,9 @@ android {
         externalNativeBuild {
             cmake {
                 arguments(
-                    "-DENABLE_QT=OFF", // Don't use QT
-                    "-DENABLE_SDL2=OFF", // Don't use SDL
-                    "-DENABLE_WEB_SERVICE=OFF", // Don't use telemetry
+                    "-DENABLE_QT=0", // Don't use QT
+                    "-DENABLE_SDL2=0", // Don't use SDL
+                    "-DENABLE_WEB_SERVICE=0", // Don't use telemetry
                     "-DBUNDLE_SPEEX=ON",
                     "-DANDROID_ARM_NEON=true", // cryptopp requires Neon to work
                     "-DCITRON_USE_BUNDLED_VCPKG=ON",
@@ -212,7 +203,7 @@ tasks.getByPath("ktlintMainSourceSetCheck").doFirst { showFormatHelp.invoke() }
 tasks.getByPath("loadKtlintReporters").dependsOn("ktlintReset")
 
 ktlint {
-    version.set("0.51.1")
+    version.set("0.47.1")
     android.set(true)
     ignoreFailures.set(false)
     disabledRules.set(
@@ -237,21 +228,22 @@ play {
 }
 
 dependencies {
-    implementation("androidx.core:core-ktx:1.15.0")
-    implementation("androidx.appcompat:appcompat:1.7.0")
-    implementation("androidx.recyclerview:recyclerview:1.4.0")
-    implementation("androidx.constraintlayout:constraintlayout:2.2.0")
-    implementation("androidx.fragment:fragment-ktx:1.8.6")
+    implementation("androidx.core:core-ktx:1.12.0")
+    implementation("androidx.appcompat:appcompat:1.6.1")
+    implementation("androidx.recyclerview:recyclerview:1.3.1")
+    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+    implementation("androidx.fragment:fragment-ktx:1.6.1")
     implementation("androidx.documentfile:documentfile:1.0.1")
-    implementation("com.google.android.material:material:1.12.0")
+    implementation("com.google.android.material:material:1.9.0")
     implementation("androidx.preference:preference-ktx:1.2.1")
-    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.8.7")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.2")
     implementation("io.coil-kt:coil:2.2.2")
     implementation("androidx.core:core-splashscreen:1.0.1")
-    implementation("androidx.window:window:1.3.0")
+    implementation("androidx.window:window:1.2.0-beta03")
+    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
     implementation("androidx.swiperefreshlayout:swiperefreshlayout:1.1.0")
-    implementation("androidx.navigation:navigation-fragment-ktx:2.8.7")
-    implementation("androidx.navigation:navigation-ui-ktx:2.8.7")
+    implementation("androidx.navigation:navigation-fragment-ktx:2.7.4")
+    implementation("androidx.navigation:navigation-ui-ktx:2.7.4")
     implementation("info.debatty:java-string-similarity:2.0.0")
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.0")
 }
diff --git a/src/android/build.gradle.kts b/src/android/build.gradle.kts
index 88b32aaab..b77906ed6 100644
--- a/src/android/build.gradle.kts
+++ b/src/android/build.gradle.kts
@@ -1,12 +1,11 @@
 // SPDX-FileCopyrightText: 2023 yuzu Emulator Project
-// SPDX-FileCopyrightText: 2025 citron Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id("com.android.application") version "8.8.1" apply false
-    id("com.android.library") version "8.8.1" apply false
-    id("org.jetbrains.kotlin.android") version "2.1.20-RC" apply false
+    id("com.android.application") version "8.1.2" apply false
+    id("com.android.library") version "8.1.2" apply false
+    id("org.jetbrains.kotlin.android") version "1.9.20" apply false
 }
 
 tasks.register("clean").configure {
@@ -18,6 +17,6 @@ buildscript {
         google()
     }
     dependencies {
-        classpath("androidx.navigation:navigation-safe-args-gradle-plugin:2.8.7")
+        classpath("androidx.navigation:navigation-safe-args-gradle-plugin:2.6.0")
     }
 }