update travis

Author: vkocheryzhkin

.travis.yml

@@ -1,25 +1,32 @@
 language: android
+jdk: oraclejdk8
+env:
+  global:
+    - ANDROID_TARGET=android-23
+    - ANDROID_ABI=armeabi-v7a
 android:
   components:
     # Uncomment the lines below if you want to
     # use the latest revision of Android SDK Tools
+    - tools
+    - platform-tools
     - build-tools-27.0.3
     - android-23
-    - extra
-
-    # The BuildTools version used by your project
-    - build-tools-27.0.3
-
-    # The SDK version used to compile your project
-    - android-23
+    - extra-android-m2repository
+    - sys-img-${ANDROID_ABI}-${ANDROID_TARGET}
 
     # Additional components
     #- extra-google-google_play_services
-    - extra-google-m2repository
-    - extra-android-m2repository
+    #- extra-google-m2repository
+    #- extra-android-m2repository
     #- addon-google_apis-google-26
 
     # Specify at least one system image,
     # if you need to run emulator(s) during your tests
-    - sys-img-armeabi-v7a-android-26
-    #- sys-img-armeabi-v7a-android-17
+    #- sys-img-armeabi-v7a-android-26
+    #- sys-img-armeabi-v7a-android-17
+
+
+before_install:
+- chmod +x visionSamples/FaceTracker/gradlew
+- ./visionSamples/FaceTracker/gradlew dependencies || true