Add Travis

.travis.yml

@@ -0,0 +1,28 @@
+language: android
+
+jdk:
+  - oraclejdk8
+
+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/
+
+install:
+    - pushd $ANDROID_HOME
+    - rm -rf tools
+    - wget -q https://dl.google.com/android/repository/sdk-tools-linux-4333796.zip -O tools.zip
+    - unzip -q tools.zip
+    - popd
+    - touch $HOME/.android/repositories.cfg
+    - yes | sdkmanager
+        "build-tools;27.0.3"
+        "platforms;android-27"
+      >/dev/null
+
+script:
+    - ./gradlew assembleDebug check