Update travis CI

.travis.yml

@@ -1,11 +1,37 @@
 language: android
+jdk: oraclejdk8
+sudo: required # For faster internet speeds and more memory
+
+before_install:
+- mkdir "$ANDROID_HOME/licenses" || true
+- echo -e "\n8933bad161af4178b1185d1a37fbf41ea5269c55" > "$ANDROID_HOME/licenses/android-sdk-license"
+- echo -e "\n84831b9409646a918e30573bab4c9c91346d8abd" > "$ANDROID_HOME/licenses/android-sdk-preview-license"
 
 android:
   components:
+  # https://github.com/travis-ci/travis-ci/issues/6040#issuecomment-219367943
+  - tools
+  - tools
+  - platform-tools
   - build-tools-28.0.2
   - android-28
 
   licenses:
   - 'android-sdk-preview-license-52d11cd2'
   - 'android-sdk-license-.+'
   - 'google-gdk-license-.+'
+
+before_cache:
+- rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+- rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+
+cache:
+  directories:
+  - $HOME/.gradle/caches/
+  - $HOME/.gradle/wrapper/
+  - $HOME/.android/build-cache
+
+before_script:
+- echo y | ${ANDROID_HOME}/tools/bin/sdkmanager --channel=3 "tools" "platform-tools" "build-tools;28.0.2" "platforms;android-28" "extras;google;m2repository"
+
+script: ./gradlew clean build test