1. Authenticate with Mobile Number OTP
2. Profile Activity (Name, Age, Sex, Address, Blood Group)
3. ADD friend or Contact (Who can Track to you)
4. Panic Button(when Click then update location lang and lat in firebase database)
All user and user location will be shown on the firebase. When a user clicks the panic button then current location show in firebase.
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this my current application if you need source code for this I will provide this
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I am Google Certified Android Developer with experience of 3 years. I have developed various Android application and can help you with this project of yours.