diff --git a/app/build.gradle b/app/build.gradle
new file mode 100644
index 00000000..a97ebab7
--- /dev/null
+++ b/app/build.gradle
@@ -0,0 +1,106 @@
+/*
+ * Copyright © 2014-2019 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    id 'kotlin-android'
+    id 'kotlin-kapt'
+    id 'kotlin-android-extensions'
+}
+
+android {
+    defaultConfig {
+        applicationId 'com.zeapo.pwdstore'
+    }
+
+    lintOptions {
+        abortOnError = true // make sure build fails with lint errors!
+        disable 'MissingTranslation', 'PluralsCandidate'
+    }
+
+    packagingOptions {
+        exclude '.readme'
+        exclude 'META-INF/LICENSE.txt'
+        exclude 'META-INF/NOTICE.txt'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled = true
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+        debug {
+            applicationIdSuffix = '.debug'
+            versionNameSuffix = '-debug'
+            minifyEnabled = false
+        }
+    }
+
+    /*
+     * To sign release builds, create the file `gradle.properties` in
+     * $HOME/.gradle or in your project directory with this content:
+     *
+     * mStoreFile=/path/to/key.store
+     * mStorePassword=xxx
+     * mKeyAlias=alias
+     * mKeyPassword=xxx
+     */
+    if (project.hasProperty('mStoreFile') &&
+            project.hasProperty('mStorePassword') &&
+            project.hasProperty('mKeyAlias') &&
+            project.hasProperty('mKeyPassword')) {
+        signingConfigs {
+            release {
+                storeFile = file(project.properties['mStoreFile'] as String)
+                storePassword = project.properties['mStorePassword'] as String
+                keyAlias = project.properties['mKeyAlias'] as String
+                keyPassword = project.properties['mKeyPassword'] as String
+            }
+        }
+        buildTypes.release.signingConfig = signingConfigs.release
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:' + versions.appcompat
+    implementation 'androidx.cardview:cardview:' + versions.cardview
+    implementation 'androidx.core:core-ktx:' + versions.coreKtx
+    implementation 'androidx.constraintlayout:constraintlayout:' + versions.constraintLayout
+    implementation 'androidx.documentfile:documentfile:' + versions.documentfile
+    implementation 'androidx.preference:preference:' + versions.preference
+    implementation ('androidx.recyclerview:recyclerview:' + versions.recyclerview) {
+        force = true
+    }
+    implementation 'com.google.android.material:material:' + versions.material
+    implementation 'androidx.annotation:annotation:' + versions.annotation
+    implementation 'androidx.biometric:biometric:' + versions.biometric
+    implementation 'org.sufficientlysecure:openpgp-api:' + versions.openpgp
+    implementation('org.eclipse.jgit:org.eclipse.jgit:' + versions.jgit) {
+        exclude group: 'org.apache.httpcomponents', module: 'httpclient'
+    }
+    implementation 'com.jcraft:jsch:' + versions.jsch
+    implementation 'commons-io:commons-io:' + versions.commons_io
+    implementation 'commons-codec:commons-codec:' + versions.commons_codec
+    implementation 'org.sufficientlysecure:sshauthentication-api:' + versions.sshauth
+
+    // Testing-only dependencies
+    androidTestImplementation 'junit:junit:4.13-beta-3'
+    androidTestImplementation 'org.mockito:mockito-core:3.1.0'
+    androidTestImplementation 'androidx.test:runner:1.3.0-alpha02'
+    androidTestImplementation 'androidx.test:rules:1.3.0-alpha02'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2-alpha02'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0-alpha02'
+    androidTestImplementation 'androidx.test.espresso:espresso-intents:3.3.0-alpha02'
+}
+
+tasks.withType(JavaCompile) {
+    options.compilerArgs << '-Xlint:unchecked'
+    options.deprecation = true
+}
+tasks.withType(KotlinCompile) {
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
deleted file mode 100644
index 1d0955c2..00000000
--- a/app/build.gradle.kts
+++ /dev/null
@@ -1,114 +0,0 @@
-import org.gradle.api.JavaVersion.VERSION_1_8
-import org.jetbrains.kotlin.config.KotlinCompilerVersion
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-
-plugins {
-    id("com.android.application")
-    id("kotlin-android")
-    id("kotlin-android-extensions")
-    id("eclipse")
-}
-
-android {
-    compileSdkVersion(29)
-
-    defaultConfig {
-        applicationId = "com.zeapo.pwdstore"
-        minSdkVersion(21)
-        targetSdkVersion(29)
-        versionCode = 10303
-        versionName = "1.3.3"
-        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
-    }
-
-    buildTypes {
-        getByName("debug") {
-            applicationIdSuffix = ".debug"
-        }
-    }
-
-    compileOptions {
-        sourceCompatibility = VERSION_1_8
-        targetCompatibility = VERSION_1_8
-    }
-
-    lintOptions {
-        isAbortOnError = true // make sure build fails with lint errors!
-        disable("MissingTranslation", "PluralsCandidate")
-    }
-
-    packagingOptions {
-        exclude(".readme")
-        exclude("META-INF/LICENSE.txt")
-        exclude("META-INF/NOTICE.txt")
-    }
-
-    /*
-     * To sign release builds, create the file `gradle.properties` in
-     * $HOME/.gradle or in your project directory with this content:
-     *
-     * mStoreFile=/path/to/key.store
-     * mStorePassword=xxx
-     * mKeyAlias=alias
-     * mKeyPassword=xxx
-     */
-    if (project.hasProperty("mStoreFile") &&
-            project.hasProperty("mStorePassword") &&
-            project.hasProperty("mKeyAlias") &&
-            project.hasProperty("mKeyPassword")) {
-        signingConfigs {
-            getByName("release") {
-                storeFile = file(project.properties["mStoreFile"] as String)
-                storePassword = project.properties["mStorePassword"] as String
-                keyAlias = project.properties["mKeyAlias"] as String
-                keyPassword = project.properties["mKeyPassword"] as String
-            }
-        }
-        buildTypes.getByName("release").signingConfig = signingConfigs.getByName("release")
-    }
-}
-
-dependencies {
-    implementation("androidx.appcompat:appcompat:1.1.0")
-    implementation("androidx.cardview:cardview:1.0.0")
-    implementation("androidx.core:core-ktx:1.2.0-beta01")
-    implementation("androidx.constraintlayout:constraintlayout:2.0.0-beta3")
-    implementation("androidx.documentfile:documentfile:1.0.1")
-    implementation("androidx.preference:preference:1.1.0")
-    implementation("androidx.recyclerview:recyclerview:1.1.0-rc01")
-    implementation("com.google.android.material:material:1.1.0-alpha10")
-    implementation("androidx.annotation:annotation:1.1.0")
-    implementation("androidx.biometric:biometric:1.0.0-rc02")
-    implementation("org.sufficientlysecure:openpgp-api:12.0")
-    implementation("org.eclipse.jgit:org.eclipse.jgit:3.7.1.201504261725-r") {
-        exclude(group = "org.apache.httpcomponents", module = "httpclient")
-    }
-    implementation("com.jcraft:jsch:0.1.55")
-    implementation("commons-io:commons-io:2.5")
-    implementation("commons-codec:commons-codec:1.13")
-    implementation("com.jayway.android.robotium:robotium-solo:5.6.3")
-    implementation(kotlin("stdlib-jdk8", KotlinCompilerVersion.VERSION))
-    implementation("org.sufficientlysecure:sshauthentication-api:1.0")
-
-    // Testing-only dependencies
-    androidTestImplementation("junit:junit:4.13-beta-3")
-    androidTestImplementation("org.mockito:mockito-core:3.1.0")
-    androidTestImplementation("androidx.test:runner:1.3.0-alpha02")
-    androidTestImplementation("androidx.test:rules:1.3.0-alpha02")
-    androidTestImplementation("androidx.test.ext:junit:1.1.2-alpha02")
-    androidTestImplementation("androidx.test.espresso:espresso-core:3.3.0-alpha02")
-    androidTestImplementation("androidx.test.espresso:espresso-intents:3.3.0-alpha02")
-}
-
-tasks {
-    withType<JavaCompile> {
-        options.compilerArgs.add("-Xlint:unchecked")
-        options.isDeprecation = true
-    }
-    withType<KotlinCompile> {
-        kotlinOptions {
-            jvmTarget = "1.8"
-            freeCompilerArgs = freeCompilerArgs + "-Xnew-inference"
-        }
-    }
-}
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 00000000..a8e3e30b
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,67 @@
+/*
+ * Copyright © 2014-2019 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+buildscript {
+    apply from: rootProject.file('versions.gradle')
+    repositories {
+        google()
+        jcenter()
+        mavenCentral()
+        maven { url 'https://plugins.gradle.org/m2/' }
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:' + versions.gradlePlugin
+        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:' + versions.kotlin
+        classpath 'com.diffplug.spotless:spotless-plugin-gradle:' + versions.spotless
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+        mavenCentral()
+    }
+}
+
+subprojects {
+    apply from: rootProject.file('versions.gradle')
+    apply from: rootProject.file('spotless.gradle')
+    repositories {
+        google()
+        jcenter()
+    }
+    if (plugins.hasPlugin('kotlin-android')) {
+        dependencies {
+            implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:' + versions.kotlin
+        }
+    }
+    if (it.name == 'app') {
+        apply plugin: 'com.android.application'
+    } else {
+        apply plugin: 'com.android.library'
+    }
+    android {
+        compileSdkVersion versions.compileSdk
+        buildToolsVersion = versions.buildTools
+        defaultConfig {
+            minSdkVersion versions.minSdk
+            targetSdkVersion versions.targetSdk
+            versionCode versions.versionCode
+            versionName versions.versionName
+        }
+        compileOptions {
+            sourceCompatibility = JavaVersion.VERSION_1_8
+            targetCompatibility = JavaVersion.VERSION_1_8
+        }
+    }
+}
+
+apply from: rootProject.file('spotless.root.gradle')
+
+tasks {
+    wrapper {
+        distributionType = Wrapper.DistributionType.ALL
+    }
+}
diff --git a/build.gradle.kts b/build.gradle.kts
deleted file mode 100644
index e22b4678..00000000
--- a/build.gradle.kts
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- * Copyright © 2014-2019 The Android Password Store Authors. All Rights Reserved.
- * SPDX-License-Identifier: GPL-3.0-only
- */
-import com.github.benmanes.gradle.versions.updates.DependencyUpdatesTask
-
-buildscript {
-    repositories {
-        google()
-        jcenter()
-        mavenCentral()
-    }
-    dependencies {
-        classpath("com.android.tools.build:gradle:3.5.0")
-        classpath(kotlin("gradle-plugin", "1.3.50"))
-    }
-}
-
-plugins {
-    id("com.github.ben-manes.versions") version "0.27.0"
-}
-
-allprojects {
-    repositories {
-        google()
-        jcenter()
-        mavenCentral()
-    }
-}
-tasks {
-    named<DependencyUpdatesTask>("dependencyUpdates") {
-        resolutionStrategy {
-            componentSelection {
-                all {
-                    if (listOf("commons-io", "org.eclipse.jgit").contains(candidate.group)) {
-                        reject("Blacklisted package")
-                    }
-                }
-            }
-        }
-        checkForGradleUpdate = true
-        outputFormatter = "json"
-        outputDir = "build/dependencyUpdates"
-        reportfileName = "report"
-    }
-
-    named<Wrapper>("wrapper") {
-        gradleVersion = "5.6.3"
-        distributionType = Wrapper.DistributionType.ALL
-    }
-}
-
-configureSpotless()
diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
deleted file mode 100644
index 24b366c0..00000000
--- a/buildSrc/build.gradle.kts
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright © 2014-2019 The Android Password Store Authors. All Rights Reserved.
- * SPDX-License-Identifier: GPL-3.0-only
- */
-plugins {
-    `kotlin-dsl`
-}
-
-repositories {
-    maven("https://plugins.gradle.org/m2/")
-    jcenter()
-}
-
-kotlinDslPluginOptions {
-    experimentalWarning.set(false)
-}
-
-dependencies {
-    implementation("com.diffplug.spotless:spotless-plugin-gradle:3.24.3")
-}
diff --git a/buildSrc/src/main/kotlin/SpotlessConfiguration.kt b/buildSrc/src/main/kotlin/SpotlessConfiguration.kt
deleted file mode 100644
index ff8ce05b..00000000
--- a/buildSrc/src/main/kotlin/SpotlessConfiguration.kt
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * Copyright © 2014-2019 The Android Password Store Authors. All Rights Reserved.
- * SPDX-License-Identifier: GPL-3.0-only
- */
-import com.diffplug.gradle.spotless.SpotlessExtension
-import com.diffplug.gradle.spotless.SpotlessPlugin
-import org.gradle.api.Project
-import org.gradle.kotlin.dsl.apply
-import org.gradle.kotlin.dsl.configure
-
-val kotlinLicenseHeader = """/*
- * Copyright © 2014-2019 The Android Password Store Authors. All Rights Reserved.
- * SPDX-License-Identifier: GPL-3.0-only
- */
-""".trimIndent()
-
-fun Project.configureSpotless() {
-    apply<SpotlessPlugin>()
-
-    configure<SpotlessExtension> {
-        java {
-            target("**/src/main/**/*.java")
-            trimTrailingWhitespace()
-            @Suppress("INACCESSIBLE_TYPE")
-            licenseHeader(kotlinLicenseHeader)
-            removeUnusedImports()
-            googleJavaFormat().aosp()
-            endWithNewline()
-        }
-
-        kotlinGradle {
-            target("*.gradle.kts", "gradle/*.gradle.kts", "buildSrc/*.gradle.kts")
-            ktlint("0.31.0").userData(mapOf("indent_size" to "4", "continuation_indent_size" to "4"))
-            @Suppress("INACCESSIBLE_TYPE")
-            licenseHeader(kotlinLicenseHeader, "import|tasks|apply|plugins|include|buildscript")
-            trimTrailingWhitespace()
-            indentWithSpaces()
-            endWithNewline()
-        }
-
-        kotlin {
-            target("**/src/main/**/*.kt", "buildSrc/**/*.kt")
-            ktlint("0.31.0").userData(mapOf("indent_size" to "4", "continuation_indent_size" to "4"))
-            @Suppress("INACCESSIBLE_TYPE")
-            licenseHeader(kotlinLicenseHeader, "import|package|class|object|@file")
-            trimTrailingWhitespace()
-            indentWithSpaces()
-            endWithNewline()
-        }
-    }
-}
diff --git a/settings.gradle.kts b/settings.gradle
similarity index 100%
rename from settings.gradle.kts
rename to settings.gradle
diff --git a/spotless.gradle b/spotless.gradle
new file mode 100644
index 00000000..301c4dd7
--- /dev/null
+++ b/spotless.gradle
@@ -0,0 +1,32 @@
+/*
+ * Copyright © 2014-2019 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+apply plugin: 'com.diffplug.gradle.spotless'
+
+spotless {
+    format 'xml', {
+        target '**/src/**/*.xml'
+        indentWithSpaces(4)
+        trimTrailingWhitespace()
+        endWithNewline()
+    }
+
+    java {
+        target '**/src/**/*.java'
+        trimTrailingWhitespace()
+        licenseHeaderFile rootProject.file('spotless.license')
+        removeUnusedImports()
+        googleJavaFormat().aosp()
+        endWithNewline()
+    }
+
+    kotlin {
+        target '**/src/**/*.kt'
+        ktlint('0.35.0').userData(['indent_size': '4', 'continuation_indent_size': '8'])
+        licenseHeaderFile rootProject.file('spotless.license')
+        trimTrailingWhitespace()
+        indentWithSpaces()
+        endWithNewline()
+    }
+}
diff --git a/spotless.license b/spotless.license
new file mode 100644
index 00000000..082cdb2e
--- /dev/null
+++ b/spotless.license
@@ -0,0 +1,4 @@
+/*
+ * Copyright © 2014-2019 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
diff --git a/spotless.root.gradle b/spotless.root.gradle
new file mode 100644
index 00000000..9d5b3a86
--- /dev/null
+++ b/spotless.root.gradle
@@ -0,0 +1,15 @@
+/*
+ * Copyright © 2014-2019 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+apply plugin: 'com.diffplug.gradle.spotless'
+
+spotless {
+    groovyGradle {
+        target '**/*.gradle', '*.gradle'
+        licenseHeaderFile 'spotless.license', 'import|tasks|apply|plugins|include|buildscript|ext|android'
+        trimTrailingWhitespace()
+        indentWithSpaces()
+        endWithNewline()
+    }
+}
diff --git a/versions.gradle b/versions.gradle
new file mode 100644
index 00000000..9670d26b
--- /dev/null
+++ b/versions.gradle
@@ -0,0 +1,41 @@
+/*
+ * Copyright © 2014-2019 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+ext {
+    versions = [
+        // Project
+        minSdk: 21,
+        targetSdk: 29,
+        compileSdk: 29,
+        versionCode: 10303,
+        versionName: '1.3.3',
+        buildTools: '29.0.2',
+
+        // Plugins
+        gradlePlugin: '3.5.1',
+        kotlin: '1.3.50',
+        spotless: '3.25.0',
+
+        // AndroidX
+        annotation: '1.1.0',
+        appcompat: '1.1.0',
+        biometric: '1.0.0-rc01',
+        cardview: '1.0.0',
+        constraintLayout: '2.0.0-beta3',
+        coreKtx: '1.2.0-beta01',
+        documentfile: '1.0.1',
+        fragmentKtx: '1.2.0-beta01',
+        material: '1.2.0-alpha01',
+        preference: '1.1.0',
+        recyclerview: '1.0.0',
+
+        // Third party
+        commons_io: '2.5',
+        commons_codec: '1.13',
+        jgit: '3.7.1.201504261725-r',
+        jsch: '0.1.55',
+        openpgp: '12.0',
+        sshauth: '1.0'
+    ]
+}