Extract common versions into project root

build.gradle

@@ -3,7 +3,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.0'
         classpath 'com.novoda:bintray-release:0.4.0'
     }
 }
@@ -25,4 +25,11 @@ ext {
     description = 'DrawerLayout-like ViewGroup, where a "drawer" is hidden under the content view, which can be shifted to make the drawer visible.'
     publishVersion = '1.0.2'
     licences = ['Apache-2.0']
+
+    compileSdkVersion = 25
+    buildToolsVersion = '25.0.2'
+    minSdkVersion = 16
+    targetSdkVersion = compileSdkVersion
+
+    supportLibVersion = '25.3.1'
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon Dec 28 10:00:20 PST 2015
+#Mon Apr 03 16:00:29 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

@@ -2,17 +2,17 @@ apply plugin: 'com.android.library'
 apply plugin: 'com.novoda.bintray-release'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         minSdkVersion 16
-        targetSdkVersion 25
+        targetSdkVersion rootProject.ext.targetSdkVersion
     }
 }
 
 dependencies {
-    compile 'com.android.support:appcompat-v7:25.2.0'
+    compile "com.android.support:appcompat-v7:$supportLibVersion"
 }
 
 publish {

sample/build.gradle

@@ -1,12 +1,12 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
     defaultConfig {
         applicationId "com.yarolegovich.slidingrootnav.sample"
         minSdkVersion 21
-        targetSdkVersion 25
+        targetSdkVersion rootProject.ext.targetSdkVersion
         versionCode 1
         versionName "1.0"
     }
@@ -20,9 +20,9 @@ android {
 }
 
 dependencies {
-    compile 'com.android.support:appcompat-v7:25.2.0'
-    compile 'com.android.support:design:25.2.0'
-    compile 'com.android.support:recyclerview-v7:25.2.0'
+    compile "com.android.support:appcompat-v7:$supportLibVersion"
+    compile "com.android.support:design:$supportLibVersion"
+    compile "com.android.support:recyclerview-v7:$supportLibVersion"
 
     compile project(':library')
 }