Gradle 4 and Android plugin 3, fix #433

build.gradle

@@ -1,10 +1,11 @@
 buildscript {
     repositories {
+        google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
-        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
+        classpath 'com.android.tools.build:gradle:3.0.0'
+        classpath 'com.github.dcendents:android-maven-gradle-plugin:2.0'
     }
 }
 
@@ -13,7 +14,7 @@ allprojects {
     version = 'master-SNAPSHOT'
     ext.isReleaseVersion = !version.endsWith("SNAPSHOT")
 
-    ext.androidBuildVersionTools = "26.0.2"
+    ext.androidBuildVersionTools = "27.0.0"
     ext.gdxVersion = "1.9.6"
     ext.gwtVersion = "2.8.0"
     ext.slf4jVersion = "1.7.25"
@@ -27,22 +28,22 @@ allprojects {
     }
 }
 
-def androidCompileSdk() { return 26 }
+static def androidCompileSdk() { return 27 }
 
 // Minimum API Level by Support Library
-def androidMinSdk() { return 14 }
+static def androidMinSdk() { return 14 }
 
-def androidTargetSdk() { return 22 }
+static def androidTargetSdk() { return 22 }
 
-def versionCode() { return 50 }
+static def versionCode() { return 1 }
 
 def versionName() { return version }
 
 subprojects {
     repositories {
+        google()
         maven { url 'https://repo.boundlessgeo.com/main' }
         jcenter()
-        maven { url 'https://maven.google.com' }
     }
 
     tasks.withType(JavaCompile) {