chore: support for build with java10 (#130)

android/build.gradle

@@ -2,10 +2,11 @@
 
 buildscript {
     repositories {
+        google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.1'
+        classpath 'com.android.tools.build:gradle:3.1.3'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -14,6 +15,7 @@ buildscript {
 
 allprojects {
     repositories {
+        google()
         jcenter()
     }
 }

android/gradle.properties

@@ -16,3 +16,8 @@
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
+
+# Due to a known issue with Android Gradle Plugin versions 3.0.* and 3.1.*,
+# the configuration on demand should be disabled.
+# https://developer.android.com/studio/known-issues
+org.gradle.configureondemand=false

android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.7-all.zip

android/widgets/build.gradle

@@ -11,7 +11,7 @@ def computeCompileSdkVersion () {
         return compileSdk
     }
     else {
-        return 25
+        return 27
     }
 }
 
@@ -20,7 +20,16 @@ def computeBuildToolsVersion() {
         return buildToolsVersion
     }
     else {
-        return "25.0.2"
+        return "27.0.3"
+    }
+}
+
+def computeSupportVersion() {
+    if(project.hasProperty("supportVersion")) {
+        return supportVersion
+    }
+    else {
+        return "27.1.1"
     }
 }
 
@@ -29,7 +38,7 @@ def computeTargetSdkVersion() {
         return targetSdk
     }
     else {
-        return 25
+        return 27
     }
 }
 
@@ -53,7 +62,7 @@ android {
 
 dependencies {
     compile fileTree(include: ['*.jar'], dir: 'libs')
-    compile 'com.android.support:support-v4:+'
+    compile 'com.android.support:support-v4:' + computeSupportVersion()
 }
 
 task cleanBuildDir (type: Delete) {