Accept android licenses (#968)

Author: samtstern

.travis.yml

@@ -10,18 +10,14 @@ cache:
     - $HOME/.gradle/caches/
     - $HOME/.gradle/wrapper/
     - $HOME/.android/build-cache
-before_install:
-  - mkdir "$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
 before_script:
   - mv library/google-services.json app/google-services.json
-  - ${ANDROID_HOME}tools/bin/sdkmanager --channel=3 "tools" "platform-tools" "build-tools;26.0.1" "platforms;android-26" "extras;google;m2repository"
+  - echo y | ${ANDROID_HOME}tools/bin/sdkmanager --channel=3 "tools" "platform-tools" "build-tools;26.0.1" "platforms;android-26" "extras;google;m2repository"
 script: ./gradlew clean assembleDebug check
 after_failure:
   # tests