use Gradle Kotlin DSL

.gitignore

@@ -2,7 +2,7 @@
 .gradle
 local.properties
 build/
-signing.properties
+keystore.properties
 *.keystore
 /.idea
 /releases

app/build.gradle

@@ -1,65 +0,0 @@
-plugins {
-    id "com.android.application"
-}
-
-android {
-    compileSdkVersion 31
-    buildToolsVersion "31.0.0"
-    defaultConfig {
-        applicationId "org.grapheneos.pdfviewer"
-        minSdkVersion 26
-        targetSdkVersion 31
-        versionCode 6
-        versionName versionCode.toString()
-        resConfigs "en"
-    }
-
-    signingConfigs {
-        release
-    }
-    buildTypes {
-        debug {
-            applicationIdSuffix ".debug"
-        }
-        release {
-            minifyEnabled true
-            shrinkResources true
-            proguardFiles getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro"
-            signingConfig signingConfigs.release
-        }
-    }
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_11
-        targetCompatibility JavaVersion.VERSION_11
-    }
-}
-
-dependencies {
-    implementation fileTree(include: ["*.jar"], dir: "libs")
-    implementation "androidx.appcompat:appcompat:1.4.0"
-    implementation "com.google.android.material:material:1.4.0"
-}
-
-def props = new Properties()
-def propFile = new File("signing.properties")
-
-if (propFile.canRead()) {
-    props.load(new FileInputStream(propFile))
-
-    if (props != null &&
-            props.containsKey("STORE_FILE")     &&
-            props.containsKey("STORE_PASSWORD") &&
-            props.containsKey("KEY_ALIAS")      &&
-            props.containsKey("KEY_PASSWORD")) {
-        android.signingConfigs.release.storeFile = rootProject.file(props["STORE_FILE"])
-        android.signingConfigs.release.storePassword = props["STORE_PASSWORD"]
-        android.signingConfigs.release.keyAlias = props["KEY_ALIAS"]
-        android.signingConfigs.release.keyPassword = props["KEY_PASSWORD"]
-    } else {
-        println "signing.properties found but some entries are missing"
-        android.buildTypes.release.signingConfig = null
-    }
-} else {
-    println "signing.properties not found"
-    android.buildTypes.release.signingConfig = null
-}

app/build.gradle.kts

@@ -0,0 +1,63 @@
+import java.util.Properties
+import java.io.FileInputStream
+
+val keystorePropertiesFile = rootProject.file("keystore.properties")
+val useKeystoreProperties = keystorePropertiesFile.canRead()
+val keystoreProperties = Properties()
+if (useKeystoreProperties) {
+    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
+}
+
+plugins {
+    id("com.android.application")
+}
+
+android {
+    if (useKeystoreProperties) {
+        signingConfigs {
+            create("release") {
+                storeFile = rootProject.file(keystoreProperties["storeFile"]!!)
+                storePassword = keystoreProperties["storePassword"] as String
+                keyAlias = keystoreProperties["keyAlias"] as String
+                keyPassword = keystoreProperties["keyPassword"] as String
+            }
+        }
+    }
+
+    compileSdk = 31
+    buildToolsVersion("31.0.0")
+
+    defaultConfig {
+        applicationId = "org.grapheneos.pdfviewer"
+        minSdk = 26
+        targetSdk = 31
+        versionCode = 6
+        versionName = versionCode.toString()
+        resConfigs("en")
+    }
+
+    buildTypes {
+        getByName("debug") {
+            applicationIdSuffix = ".debug"
+        }
+
+        getByName("release") {
+            isShrinkResources = true
+            isMinifyEnabled = true
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+            if (useKeystoreProperties) {
+                signingConfig = signingConfigs.getByName("release")
+            }
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility(JavaVersion.VERSION_11)
+        targetCompatibility(JavaVersion.VERSION_11)
+    }
+}
+
+dependencies {
+    implementation("androidx.appcompat:appcompat:1.4.0")
+    implementation("com.google.android.material:material:1.4.0")
+}

build.gradle

@@ -1,31 +0,0 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-
-buildscript {
-    repositories {
-        google()
-        mavenCentral()
-    }
-    dependencies {
-        classpath "com.android.tools.build:gradle:7.0.3"
-
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
-    }
-}
-
-allprojects {
-    repositories {
-        google()
-        mavenCentral()
-    }
-
-    gradle.projectsEvaluated {
-        tasks.withType(JavaCompile) {
-            options.compilerArgs << "-Xlint:unchecked" << "-Xlint:deprecation"
-        }
-    }
-}
-
-task clean(type: Delete) {
-    delete rootProject.buildDir
-}

build.gradle.kts

@@ -0,0 +1,22 @@
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath("com.android.tools.build:gradle:7.0.3")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.0")
+    }
+}
+
+allprojects {
+    tasks.withType<JavaCompile> {
+        val compilerArgs = options.compilerArgs
+        compilerArgs.add("-Xlint:unchecked")
+        compilerArgs.add("-Xlint:deprecation")
+    }
+}
+
+tasks.register("clean", Delete::class) {
+    delete(rootProject.buildDir)
+}

settings.gradle

@@ -1 +0,0 @@
-include ':app'

settings.gradle.kts

@@ -0,0 +1,9 @@
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+rootProject.name = "PdfViewer"
+include(":app")