public void setLocationListener(
LocationListener listener, int interval, int timeout, int maxAge) {
// * Stop all previous listener threads *
listenerRunning = false;
if (listyThread != null) {
while (listyThread.isAlive()) {
Thread.yield();
} // End old thread
listyThread = null; // Discard the listener thread instance
}
// * Remove any listeners from GPSListener *
if (listener == null) {
// Remove current listener from SimpleGPS
SimpleGPS.removeListener(gpsl);
gpsl = null;
return; // No listener provided, so return now so it dosn't make a new one
}
// * Inner classes need final variables *
final int to = timeout;
final LocationListener l = listener;
final LocationProvider lp = this;
final int delay = interval * 1000; // Oddly interval is in seconds, and not float
// Make new thread here and start it if interval > 0, else if -1
// then use the GPSListener interface.
if (interval > 0) { // Notify according to interval by user
listyThread =
new Thread() {
public void run() {
while (listenerRunning) {
try {
// TODO: Probably only notify if location changed? Need to compare to old.
// TODO: Make helper method since this is used below too.
l.locationUpdated(lp, lp.getLocation(to));
Thread.sleep(delay);
} catch (LocationException e) {
// TODO Auto-generated catch block
} catch (InterruptedException e) {
// TODO Auto-generated catch block
}
}
}
};
listyThread.setDaemon(true); // so JVM exits if thread is still running
listenerRunning = true;
listyThread.start();
} else if (interval < 0) { // If interval is -1, use default update interval
// In our case, update as soon as new coordinates are available from GPS (via GPSListener)
// TODO: Alternate method: Use GPSListener for ProximityListener and this.
gpsl =
new GPSListener() {
public void sentenceReceived(NMEASentence sen) {
// Check if GGASentence. Means that new location info is ready
if (sen.getHeader().equals(GGASentence.HEADER)) {
try {
// TODO: Probably only notify if location changed? Need to compare to old.
l.locationUpdated(lp, lp.getLocation(to));
} catch (LocationException e) {
// TODO Auto-generated catch block
} catch (InterruptedException e) {
// TODO Auto-generated catch block
}
}
}
};
SimpleGPS.addListener(gpsl);
}
// TODO: Need to implement LocationListener.providerStateChanged()
}
