The following project was developed for Mumbai Runners which is a running community in Mumbai. The project was built using React Native (Expo) and Firebase.
You can clone the project and after extracting the .zip file you need to create a folder named src inside the main project and move the folders : actions, components, config, date-icons, fonts, images, pages, reducers, theme, utils.
Open cmd from the project directory you need to execute the command npm install for installing the packages.
You will have to make changes to the Firebase Credentials. This can be done in the firebase.js file in the /src folder.
https://drive.google.com/open?id=1E0wX8RVxmJfMYcYGTU51bjgt4ovaUdjn