Dear all,
I have developed a small app that helps the driver to regulate his
speed in order to pass the traffic light when it is green; and thereby
minimizing the number of times that he has to stop for red.
But, the app does not always work as anticipated.
In my app, I need to get the timedifference from when he starts
driving to the actual time.
This time is needed in order to calculate whether he will reach the
light when it is green, or if he needs to slow down in case the
current speed is too high.
I will appreciate any help that can guide me in the right direction to
identify the problem: is it due to Java and that it cannot control the
on-going queueing of GPS data? is it due to problems with HTC Hero and
Android 1.5; or is it something much more simple that causes my
problem. Please, send me your input.
I have inserted the most relevant parts of the code below which is
structurized as:
1) gpspos() is the function called when I want to start the routine
(the main app is launched before).
2) initial_time should contain the timesample from when I call the
routine. That is the reason why I set it to zero in the beginning and
then update it the first time the conditions distance_1< radius and
counter_L are fulfilled. These conditions are fulfilled when I call
gpspos().
3) time=location.getTime() is the GPS clock.
4) double spend_time_1_sec = (time - initial_time); determines the
time spend since I called gpspos().
Thank you for your time and help
CKLOCH
public void gpspos() {
super.onResume();
LocationManager locMgr = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
LocationListener locListener = new LocationListener()
{
double initial_time = 0;
public void onLocationChanged(Location location)
{
if (location != null)
{
double time = location.getTime()/1000;
double spend_time_1_sec = (time -
initial_time);
if (distance_1<radius &&
counter_L==1) // This is only true once when the routine gpspos() is
called
{
initial_time = location.getTime()/1000; //
initial_time is in seconds
}
}
}
}
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