build: add travis ci

.travis.yml

@@ -0,0 +1,45 @@
+language: android
+sudo: required
+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/
+ -$HOME/.gradle/wrapper/
+
+ env:
+  global:
+  - ANDROID_API=25
+  - EMULATOR_API=23
+  - ANDROID_BUILD_TOOLS=25.0.3
+  - ADB_INSTALL_TIMEOUT=5 # minutes
+
+  android:
+   components:
+   - tools
+   - platform-tools
+   - build-tools-$ANDROID_BUILD_TOOLS
+   - android-$ANDROID_API
+   - android-$EMULATOR_API_LEVEL
+   - extra-google-m2repository
+   - extra-android-m2repository # for design library
+   - addon-google_apis-google-19 # google play services
+   - sys-img-armeabi-v7a-addon-google_apis-google-$ANDROID_API_LEVEL
+   - sys-img-armeabi-v7a-addon-google_apis-google-$EMULATOR_API_LEVEL
+   licenses:
+   - android-sdk-preview-license-.+
+   - android-sdk-license-.+
+   - google-gdk-license-.+
+
+
+   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"
+   - chmod +x gradlew
+   - ./gradlew dependencies || true