travis download android sdk

.travis.yml

   # clean
   - watchman watch-del-all 2> /dev/null || true
   - rm -rf "$TMPDIR/react-packager-*" || true
-
+  # download android sdk
+  - curl --location https://dl.google.com/android/android-sdk_r24.4.1-linux.tgz | tar -x -z -C $HOME
+  - export ANDROID_HOME=$HOME/android-sdk-linux
+  - export PATH=$PATH:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools
+  - ( sleep 5 && while [ 1 ]; do sleep 1; echo y; done ) | android update sdk --no-ui -a --filter tools,platform-tools,build-tools-25.0.0,android-25,addon-google_apis-google-24,extra-android-m2repository,extra-google-google_play_services,extra-google-m2repository
 
 install:
   - npm i -g yarn