updated Android example gradle config

android-example/app/build.gradle

@@ -9,9 +9,6 @@ android {
         targetSdkVersion 25
         versionCode 2
         versionName '1.1'
-        jackOptions {
-            enabled true
-        }
     }
     buildTypes {
         release {

android-example/build.gradle

@@ -3,9 +3,10 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.1.0'
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }

android-example/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon Apr 24 21:03:24 CST 2017
+#Sun Apr 01 11:40:00 CST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

android-example/web-api/build.gradle

@@ -4,7 +4,7 @@ android {
     signingConfigs {
     }
     compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    buildToolsVersion '27.0.3'
     defaultConfig {
         minSdkVersion 19
         targetSdkVersion 25