Gradle: update gradle config

app/build.gradle

@@ -2,12 +2,12 @@ apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion "26.0.2"
+    compileSdkVersion rootProject.ext.android.COMPILE_SDK_VERSION
+    buildToolsVersion rootProject.ext.android.BUILD_TOOL_VERSION
     defaultConfig {
         applicationId "io.neoterm"
         minSdkVersion 21
-        targetSdkVersion 26
+        targetSdkVersion rootProject.ext.android.TARGET_SDK_VERSION
         versionCode 32
         versionName "2.0.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
@@ -53,7 +53,7 @@ dependencies {
     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
+    compile rootProject.ext.deps["kotlin-stdlib"]
     testCompile 'junit:junit:4.12'
     compile 'com.android.support.constraint:constraint-layout:1.0.2'
     compile 'org.greenrobot:eventbus:3.0.0'

build.gradle

@@ -1,7 +1,6 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.2.0'
     ext.getGitHeadRefsSuffix = {
         try {
             def headFile = new File('.git/HEAD')
@@ -22,6 +21,26 @@ buildscript {
         return ""
     }
 
+    ext.android = [
+            ANDROID_SUPPORT_VERSION: '27.0.2',
+
+            KOTLIN_VERSION         : '1.2.0',
+
+            COMPILE_SDK_VERSION    : 27,
+
+            TARGET_SDK_VERSION     : 27,
+
+            BUILD_TOOL_VERSION     : '27.0.2',
+    ]
+
+    ext.deps =
+            [
+                    "appcompat-v7": "com.android.support:appcompat-v7: ${ext.android.ANDROID_SUPPORT_VERSION}",
+                    "design"      : "com.android.support:design: ${ext.android.ANDROID_SUPPORT_VERSION}",
+                    "cardview-v7" : "com.android.support:cardview-v7: ${ext.android.ANDROID_SUPPORT_VERSION}",
+                    "kotlin-stdlib": "org.jetbrains.kotlin:kotlin-stdlib-jre7:${ext.android.KOTLIN_VERSION}"
+            ]
+
 
     repositories {
         maven { url 'https://dl.google.com/dl/android/maven2/' }
@@ -29,7 +48,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.0.1'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${rootProject.ext.android.KOTLIN_VERSION}"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files