Android Studio 3.4.2

.travis.yml

@@ -1,5 +1,14 @@
 language: android
+
 android:
   components:
-    - platform-tools
-    - tools
+    - build-tools-28.0.3
+    - android-28
+    - extra-android-m2repository
+  licenses:
+    - 'android-sdk-license-.+'
+
+jdk: oraclejdk8
+
+script:
+  - ./gradlew clean build

build.gradle

@@ -1,15 +1,16 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     repositories {
+        google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.4.2'
     }
 }
 
 allprojects {
     repositories {
+        google()
         jcenter()
     }
 }

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-2.2.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.5.1-all.zip

safeslinger-exchange/build.gradle

@@ -1,11 +1,11 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion rootProject.ext.compileSdkVersion
+    compileSdkVersion 28
 
     defaultConfig {
         minSdkVersion 8
-        targetSdkVersion 25
+        targetSdkVersion 28
     }
     sourceSets {
         main {