It is an app where I have used these features-----
i) Firebase Authentication for Login, SignIn and Forget password
ii) Goole Map Api for tracking the location
iii) Content Provider
iv) Firebase Storage
v) Firebase Cloud Messaging
Here I have used Firebase Authentication for sign in and log in via gmail id and password.
Here I have used Location Servce of Google Map Api
Content Provider is used for fetching list of contact numbers to our app
Selected Contact list is saved in Firebase Storage. And then this list is fetched to our app from Firebase Storage.
FCM is used to send topic notification to multiple users.