Update .travis.yml

Author: aminyazdanpanah

.travis.yml

@@ -15,13 +15,17 @@ android:
   components:
     - platform-tools
     - tools
+    - build-tools-$ANDROID_BUILD_TOOLS_VERSION
     - android-$ANDROID_API_LEVEL
     - extra-google-google_play_services
     - extra-android-support
     - extra-google-m2repository
     - extra-android-m2repository
+    - android-$EMULATOR_API_LEVEL
     - addon-google_apis-google-$ANDROID_API_LEVEL
     - addon-google_apis-google-$EMULATOR_API_LEVEL
+    - sys-img-armeabi-v7a-google_apis-$ANDROID_API_LEVEL
+    - sys-img-armeabi-v7a-google_apis-$EMULATOR_API_LEVEL
 
 
   licenses:
@@ -34,6 +38,10 @@ android:
     - echo -e "\n8933bad161af4178b1185d1a37fbf41ea5269c55" > "$ANDROID_HOME/licenses/android-sdk-license"
     - echo -e "\n84831b9409646a918e30573bab4c9c91346d8abd" > "$ANDROID_HOME/licenses/android-sdk-preview-license"
 
+before_script:
+  - echo no | android create avd --force -n test -t "android-"$EMULATOR_API_LEVEL --abi $ANDROID_ABI --tag $ANDROID_TAG
+  - emulator -avd test -no-skin -no-audio -no-window &
+  - android-wait-for-emulator
 
 script:
   - ./gradlew connectedAndroidTest coveralls