Extract common build versions into project root

.gitignore

@@ -1,8 +1,7 @@
 *.iml
 .gradle
 /local.properties
-/.idea/workspace.xml
-/.idea/libraries
+.idea
 .DS_Store
 /build
 /captures

build.gradle

@@ -1,12 +1,12 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.0.4'
+    ext.kotlin_version = '1.1.1'
     repositories {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
@@ -21,6 +21,15 @@ allprojects {
 
 }
 
+ext {
+    compileSdkVersion = 25
+    buildToolsVersion = '25.0.2'
+    minSdkVersion = 16
+    targetSdkVersion = compileSdkVersion
+
+    supportLibVersion = '25.3.1'
+}
+
 task clean(type: Delete) {
     delete rootProject.buildDir
 }

demo/build.gradle

@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 24
-    buildToolsVersion '25.0.2'
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         applicationId "com.yalantis.jellyanimation.demo"
-        minSdkVersion 16
-        targetSdkVersion 24
+        minSdkVersion rootProject.ext.minSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
         versionCode 1
         versionName "1.0"
 
@@ -31,6 +31,6 @@ android {
 
 dependencies {
     compile fileTree(include: ['*.jar'], dir: 'libs')
-    compile 'com.android.support:appcompat-v7:24.2.1'
+    compile "com.android.support:appcompat-v7:$supportLibVersion"
     compile project(':library')
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon Dec 28 10:00:20 PST 2015
+#Mon Apr 03 14:16:14 BST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip

library/build.gradle

@@ -3,11 +3,11 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 
 android {
-    compileSdkVersion 24
-    buildToolsVersion '25.0.2'
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 24
+        minSdkVersion rootProject.ext.minSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
         versionCode 1
         versionName "1.0"
     }
@@ -24,7 +24,7 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:24.2.1'
+    compile "com.android.support:appcompat-v7:$supportLibVersion"
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 }
 repositories {