Please refer to the tutorial below know more about this repository https://medium.com/tech-experiments/building-an-app-like-uber-using-react-native-3f6cd62097c8
Please replace the "google-api-key" string with your google developer api key in the below files:
/android/app/src/main/AndroidManifest.xml GOOGLE_MAPS_APIKEY in MapsDirectionsScreen.js GooglePlacesAutocomplete in MapsScreen.js