Question

I’ve currently finished learning the basics of android development and am trying to learn to make an android gps app in smartphones for my traffic system project. Not so very good yet in doing complicated codes. Please advise some resources or tutorials which will greatly help me to make this app.
– the app will send gps locations( lat & longitude and time ) via sms every 10 seconds once it approach a specific road section ( can be like 0.5 km length of road)
– if the phone passed that specific road section it will stop sending its locations

Answer 1

Why are you using the sms service to send the location? try using the webservice.

To implement this app you has to use the LocationManager and LocationListener libraries.
You can start by creating a gps listening class implementing the LocationListener, like the one shown below

public class CTLocationListener implements LocationListener{




@Override
public void onLocationChanged(Location location) {
    Log.w("LOCATION CHANGED", ""+location);



    if(location != null) {

        Constants.LATTITUDE = location.getLatitude();
        Constants.LONGITUDE = location.getLongitude();
        Constants.kAccuracy = location.getAccuracy();
        Constants.ALTITUDE_VALUE = location.getAltitude();
    }


}

@Override
public void onProviderDisabled(String provider) {
    Log.i("PROVIDER", "DISABLED:"+provider);


}

@Override
public void onProviderEnabled(String provider) {
    Log.i("PROVIDER", "ENABLED:"+provider);

}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    Log.i("EXTRAS", ""+extras);
    Log.i("Provider status", ""+status);
}

}

Here I’m storing the updated locations on the Constants file. Start a sheduler that checks the locations periodically and start sending messages if they match your required locations.

To trigger the gps you can use

LocationListener locationListener = new CTLocationListener(); 
LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 1.0f, locationListener);

The scheduler you need is a timertask. This can be implemented as

public class showAccuracy extends TimerTask {

    @Override
    public void run() {

        ghandler.post(new Runnable() {

            @Override
            public void run() {
                if((Constants.Latitude == yourlatitude) && .....) {

}
}
});
}

}