Fix version

.travis.yml

@@ -2,16 +2,15 @@ language: android
 android:
   components:
     - build-tools-26.0.2
-    - android-27
-    - android-21
+    - android-26
     - add-on
     - extra
     - platform-tools
     - tools
     - extra-google-googleplayservices - extra-google-m2repository
     - extra-android-m2repository
-    - addon-google_apis-google-19
-    - sys-img-armeabi-v7a-android-21
+    - addon-google_apis-google-26
+    - sys-img-armeabi-v7a-android-26
 
 env:
   global:
@@ -23,7 +22,7 @@ before_install:
   - yes | sdkmanager "platforms;android-26"
 
 before_script:
-  - echo no | android create avd --force -n test -t android-21 --abi armeabi-v7a -s "768x1280"
+  - echo no | android create avd --force -n test -t android-26 --abi armeabi-v7a -s "768x1280"
   - emulator -avd test -no-skin -no-audio -no-window &
   - adb wait-for-device
   - adb shell input keyevent 82 &