Geofencing Android App

A demo android app, explains (my version of) geofencing, which can automatically put your phone in Vibrate Mode/ General Mode, depending on your presence in the geofence area, (here it is Webel-IT-Park, Kalyani, West Bengal)

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

Prerequisites

What things you need to install the software

1. Android Studio should be set-up and running on your system.
2. Google Play Services SDK should be installed.
3. An android device running on Jelly Bean or higher.

Installing

Import the project to android studio, build the project, and finally deploy it in a device (or emulator).

Geofence Detection

The following code snippet, explains how the android device locates if the user is in a destined location

    // the following two function checks if the current location is in geo-fence area
    // function to find distance between two latitude and longitude
    public static double getDistance(double lat1, double lon1, double lat2, double lon2) {
        final int R = 6371; // Radius of the earth

        double latDistance = Math.toRadians(Math.abs(lat2 - lat1));
        double lonDistance = Math.toRadians(Math.abs(lon2 - lon1));

        double a = Math.sin(latDistance / 2) * Math.sin(latDistance / 2)
                + Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2))
                * Math.sin(lonDistance / 2) * Math.sin(lonDistance / 2);

        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));

        double distance = R * c * 1000; // distance in meter

        distance = Math.pow(distance, 2);
        return Math.sqrt(distance);
    }
    
    private boolean isInCampus(double x,double y){

        // the lat and long of : Webel-IT Park
        final double X = 22.9611167;
        final double Y = 88.4335215;
        
        // radiusToCheck is defined as 200
        // radius up to 200 m is checked
        if(getDistance(X,Y,x,y) <= radiusToCheck){
            return true;
        }
        else{
            return false;
        }
    }

Debugging and Testing

• The phone often does not goes into silent mode on entering the geofence.
• The app service does not automatically restarts after a reboot.
• There might be bug with the distance measurement algorithm.

Build With

• Google Api Client
• Fused Location Provider Client

Authors

• Jyotirmoy Paul - Initial work - jyotirmoy-paul