Update dependencies (#435)

* Gradle 4.8.1
* Update to SDK 28
* Update to robolectric 3.8
* Update to android-maven-gradle-plugin 2.1
* Gradle bintray plugin 1.8.4
* Build-info-extractor-gradle 4.7.5
* RxJava 2.1.16
* Remove now-unnecessary buildToolsVersion definitions
* Add jcenter() to repositories for trove4j

.travis.yml

@@ -1,18 +1,22 @@
 language: android
 
-jdk:
-  - oraclejdk8
-
 android:
   components:
     - tools
     - platform-tools
-    - android-26
-    - build-tools-26.0.2
+
+jdk:
+  - oraclejdk8
 
 # as per http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/
 sudo: false
 
+before_install:
+  # Install SDK license so Android Gradle plugin can install deps.
+  - mkdir "$ANDROID_HOME/licenses" || true
+  - echo "8933bad161af4178b1185d1a37fbf41ea5269c55" > "$ANDROID_HOME/licenses/android-sdk-license"
+  - echo "d56f5187479451eabf01fb78af6dfcb131a6481e" >> "$ANDROID_HOME/licenses/android-sdk-license"
+
 # script for build and release via Travis to Bintray
 script: gradle/buildViaTravis.sh
 

build.gradle

@@ -1,26 +1,27 @@
 subprojects {
     buildscript {
         repositories {
+            google()
             mavenCentral()
             jcenter()
-            google()
         }
         dependencies {
-            classpath 'com.android.tools.build:gradle:3.0.1'
-            classpath 'com.github.dcendents:android-maven-gradle-plugin:2.0'
-            classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.0'
-            classpath 'org.jfrog.buildinfo:build-info-extractor-gradle:4.5.2'
+            classpath 'com.android.tools.build:gradle:3.1.3'
+            classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
+            classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4'
+            classpath 'org.jfrog.buildinfo:build-info-extractor-gradle:4.7.5'
         }
     }
 
     repositories {
+        google()
         mavenCentral()
+        jcenter()
     }
 }
 
 ext {
     minSdkVersion = 9
-    compileSdkVersion = 26
-    buildToolsVersion = '26.0.2'
+    compileSdkVersion = 28
     sourceCompatibility = JavaVersion.VERSION_1_7
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.8.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip

rxandroid/build.gradle

@@ -19,7 +19,6 @@ logger.info("RxAndroid using version=$project.version")
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         minSdkVersion rootProject.ext.minSdkVersion
@@ -37,10 +36,10 @@ android {
 }
 
 dependencies {
-    api 'io.reactivex.rxjava2:rxjava:2.1.9'
+    api 'io.reactivex.rxjava2:rxjava:2.1.16'
 
     testImplementation 'junit:junit:4.12'
-    testImplementation 'org.robolectric:robolectric:3.3.2'
+    testImplementation 'org.robolectric:robolectric:3.8'
 }
 
 // Create source/javadoc artifacts for publishing

sample-app/build.gradle

@@ -2,11 +2,10 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         minSdkVersion 15
-        targetSdkVersion 23
+        targetSdkVersion 28
         versionCode 1
         versionName '1.0'
     }