Fix travis build

.travis.yml

@@ -6,13 +6,15 @@ android:
   components:
     # Uncomment the lines below if you want to
     # use the latest revision of Android SDK Tools
+    - tools
     - platform-tools
     - tools
 
     # The BuildTools version used by your project
     - build-tools-26.0.1
 
     # The SDK version used to compile your project
+    - android-22
     - android-26
 
     # Additional components
@@ -23,7 +25,7 @@ android:
 
     # Specify at least one system image,
     # if you need to run emulator(s) during your tests
-    - sys-img-armeabi-v7a-android-21
+    - sys-img-armeabi-v7a-android-22
 
 
 before_script:
@@ -32,7 +34,7 @@ before_script:
   - ./gradlew assemble
 
   # Emulator Management: Create, Start and Wait
-  - echo no | android create avd --force -n test -t android-21 --abi armeabi-v7a
+  - echo no | android create avd --force -n test -t android-22 --abi armeabi-v7a
   - emulator -avd test -no-skin -no-audio -no-window &
   - android-wait-for-emulator
   - adb shell input keyevent 82 &