Travis CI - Android assembly failed. Error connected devices

Trying to get started with Travis CI for my Android projects, but Travis still doesn't work building my Android project.

Cause:

:app:connectedDebugAndroidTest FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:connectedDebugAndroidTest'. > com.android.builder.testing.api.DeviceException: No connected devices! * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. BUILD FAILED 

Link to travis: https://travis-ci.org/hypeapps/Episodie/builds/158706530

.travis.yml:

 language: android jdk: - oraclejdk8 before_install: - chmod +x gradlew env: global: - ANDROID_API_LEVEL=24 - EMULATOR_API_LEVEL=21 - ANDROID_BUILD_TOOLS_VERSION=24.0.1 - ANDROID_ABI=google_apis/armeabi-v7a - ADB_INSTALL_TIMEOUT=20 # minutes (2 minutes by default) android: components: - tools - tools - platform-tools - build-tools-$ANDROID_BUILD_TOOLS_VERSION - android-$ANDROID_API_LEVEL - android-$EMULATOR_API_LEVEL - extra - add-on - extra-google-m2repository - extra-android-m2repository # Google Play Services - extra-google-google_play_services # Support library - extra-android-support - addon-google_apis-google-$ANDROID_API_LEVEL - addon-google_apis-google-$EMULATOR_API_LEVEL - sys-img-armeabi-v7a-addon-google_apis-google-$ANDROID_API_LEVEL - sys-img-armeabi-v7a-addon-google_apis-google-$EMULATOR_API_LEVEL licenses: - 'android-sdk-preview-license-52d11cd2' - 'android-sdk-license-.+' - 'google-gdk-license-.+' before_script: - echo no | android create avd --force -n test -t "Google Inc.:Google APIs:"$EMULATOR_API_LEVEL --abi $ANDROID_ABI - emulator -avd test -no-skin -no-audio -no-window & - android-wait-for-emulator 

Link to gradle file: build.gradle

Github Project: GitHub

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Decision:

add line above:

 sudo: false 

Creating Emulator Controls: Creating, Running, and Waiting

 before_script: - echo no | android create avd --force -n test -t android-21 --abi armeabi-v7a - emulator -avd test -no-skin -no-audio -no-window & - android-wait-for-emulator - adb shell input keyevent 82 & 

Now works Travis CI.

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