Fix build and update toolchains

1. Migrate to build.gradle.kts.
2. Fix building after updating share lib.
3. Update AGP and Gradle.
4. Use JDK 21 to build.

Signed-off-by: utzcoz <utzcoz@outlook.com>

Author: utzcoz

.github/workflows/gradle.yml

@@ -15,10 +15,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v6
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v5
       with:
-        java-version: 17
+        java-version: 21
         distribution: zulu
     - name: Setup Gradle
       uses: gradle/actions/setup-gradle@v5

README.md

@@ -11,7 +11,7 @@ to receive the task changed events from system.
 We provide gradle build script to build app with gradle, and develop it with Android Studio. It uses the keystore
 generated from AOSP debug key, and it will help to install debug app from Android Studio to Android.
 
-`build.gradle` use jars of above library to remove system API dependency, and
+`build.gradle.kts` uses jars of above library to remove system API dependency, and
 built this project directly and separately. The jars are built from system, so we should update them
 when we upgrade AOSP.
 
@@ -27,7 +27,7 @@ m SystemUISharedLib
 
 Copy `out/target/product/boringdroid_x86_64/obj/JAVA_LIBRARIES/SystemUISharedLib_intermediates/javalib.jar`
 to replace `SystemUIPluginLib.jar`. And then updating `src/main/SystemUISharedRes` based on
-[SystemUI SharedLib's Android.bp](https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/packages/SystemUI/shared/Android.bp).
+[SystemUI SharedLib's Android.bp](https://android.googlesource.com/platform/frameworks/base/+/refs/heads/main/packages/SystemUI/shared/Android.bp).
 
 
 The `SystemUISharedLib` is a new all-in-one library.

app/build.gradle

@@ -0,0 +1,115 @@
+import org.gradle.api.tasks.compile.JavaCompile
+import org.gradle.api.tasks.testing.Test
+import org.gradle.api.tasks.testing.logging.TestExceptionFormat
+
+plugins {
+    id("com.diffplug.spotless")
+    id("com.android.application")
+}
+
+spotless {
+    format("misc") {
+        target("*.md", ".gitignore")
+        trimTrailingWhitespace()
+        endWithNewline()
+    }
+
+    kotlinGradle {
+        target("*.gradle.kts", "**/*.gradle.kts")
+        ktfmt().kotlinlangStyle()
+    }
+
+    kotlin {
+        target("**/*.kt")
+        ktfmt().kotlinlangStyle()
+    }
+}
+
+android {
+    namespace = "com.boringdroid.systemui"
+    compileSdk = 33
+
+    defaultConfig {
+        applicationId = "com.boringdroid.systemui"
+        minSdk = 28
+        targetSdk = 33
+        versionCode = 130
+        versionName = "130"
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    sourceSets { getByName("main").resources.directories.add("src/main/SystemUISharedRes") }
+
+    buildTypes {
+        getByName("release") {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro",
+            )
+        }
+    }
+
+    signingConfigs {
+        getByName("debug") {
+            keyAlias = "androiddebugkey"
+            keyPassword = "android"
+            storeFile = file("plugin.keystore")
+            storePassword = "android"
+        }
+    }
+
+    testOptions { unitTests.isIncludeAndroidResources = true }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    lint { abortOnError = false }
+}
+
+configurations.named("implementation") {
+    exclude(group = "org.jetbrains.kotlin", module = "kotlin-stdlib")
+    exclude(group = "org.jetbrains.kotlin", module = "kotlin-stdlib-common")
+    exclude(group = "org.jetbrains.kotlin", module = "kotlin-stdlib-jdk8")
+    exclude(group = "org.jetbrains.kotlin", module = "kotlin-stdlib-jdk7")
+    exclude(group = "org.jetbrains.kotlin", module = "kotlin-reflect")
+    exclude(group = "org.jetbrains.kotlin", module = "kotlin-io")
+    exclude(group = "org.jetbrains", module = "annotations")
+    exclude(group = "androidx.core")
+    exclude(group = "androidx.annotation")
+    exclude(group = "androidx.collection")
+}
+
+dependencies {
+    implementation(files("libs/SystemUISharedLib.jar"))
+
+    testImplementation("androidx.test:core:1.6.1")
+    testImplementation("junit:junit:4.13.2")
+    testImplementation("org.robolectric:robolectric:4.16.1")
+    testImplementation("com.google.truth:truth:1.4.4")
+    androidTestImplementation("androidx.test:runner:1.6.2")
+    androidTestImplementation("androidx.test:rules:1.6.1")
+    androidTestImplementation("com.google.truth:truth:1.4.4")
+    androidTestImplementation("com.google.truth.extensions:truth-java8-extension:1.4.4")
+    androidTestImplementation("androidx.test.ext:junit:1.2.1")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.6.1")
+    androidTestImplementation("androidx.test.uiautomator:uiautomator:2.3.0")
+}
+
+tasks.withType<Test>().configureEach {
+    systemProperty("robolectric.enabledSdks", "33")
+
+    testLogging {
+        events("passed", "skipped", "failed", "standardOut", "standardError")
+        showStandardStreams = false
+        exceptionFormat = TestExceptionFormat.FULL
+    }
+
+    outputs.upToDateWhen { false }
+}
+
+tasks.withType<JavaCompile>().configureEach {
+    javaCompiler.set(javaToolchains.compilerFor { languageVersion.set(JavaLanguageVersion.of(21)) })
+}