Add Travis CI integration

.travis.yml

@@ -0,0 +1,38 @@
+before_cache: rm -f $HOME/.gradle/caches/modules-2/modules-2.lock
+cache:
+  yarn: true
+  directories:
+    - $HOME/.gradle/caches/
+    - $HOME/.gradle/wrapper/
+before_install:
+  - nvm install 12.0.0
+  - npm i -g yarn
+install: yarn
+jobs:
+  include:
+    - language: android
+      android:
+        components:
+          - build-tools-28.0.3
+          - android-28
+          - android-22
+          - sys-img-armeabi-v7a-android-22
+        licenses:
+          - android-sdk-license-.+
+      environment:
+        GRADLE_OPTS: "-Dorg.gradle.daemon=false -Dorg.gradle.workers.max=2"
+        TERM: "dumb"
+      before_script:
+        - echo no | android create avd -f -n test -t android-22 -b armeabi-v7a
+        - emulator -avd test -no-audio -no-window &
+        - android-wait-for-emulator
+        - adb shell input keyevent 82 &
+        - cd android/
+      script: ./gradlew connectedCheck
+    - language: objective-c
+      osx_image: xcode11.2
+      before_script:
+        - gem install cocoapods -v '1.8.4'
+        - cd ios/
+        - pod install
+      script: xcodebuild -workspace rnsampleapp.xcworkspace -scheme rnsampleapp -destination "platform=iOS Simulator,name=iPhone X,OS=11.4" | xcpretty && exit ${PIPESTATUS[0]}

README.md

@@ -14,9 +14,11 @@ A sample React Native app with simple CI integrations.
 
 ### Travis CI
 
-TODO
+[![Build Status][5]][6]
 
 [1]: https://github.com/fbluemle/sampleapp-react-native/workflows/main/badge.svg
 [2]: https://github.com/fbluemle/sampleapp-react-native/actions
 [3]: https://circleci.com/gh/fbluemle/sampleapp-react-native.svg?style=shield
 [4]: https://circleci.com/gh/fbluemle/sampleapp-react-native
+[5]: https://travis-ci.org/fbluemle/sampleapp-react-native.svg?branch=master
+[6]: https://travis-ci.org/fbluemle/sampleapp-react-native