Hello,
i have some questions about the addProximityAlert function.
My task is to develop an android navigation application. The app reads
some gps point out of a gpx-file.
Thats not really a problem. If the handy is near the point, the app
shall notify me this. So i used the addProximityAlert function:
setProximityAlert () {
..
double lati = lat[arrayindex]; //the saved gps data
double lng = lon[arrayindex];
expiration=-1;
..
Intent intent = new Intent(TREASURE_PROXIMITY_ALERT);
proximityIntent = PendingIntent.getBroadcast(getApplicationContext(),
0, intent, 0);
lm.addProximityAlert(lati, lng, radius, expiration, proximityIntent);
IntentFilter filter = new IntentFilter(TREASURE_PROXIMITY_ALERT);
registerReceiver(new ProximityIntentReceiver(), filter);
}
public class ProximityIntentReceiver extends BroadcastReceiver
{
public void onReceive (Context context, Intent intent) {
String key = LocationManager.KEY_PROXIMITY_ENTERING;
entering = intent.getBooleanExtra(key, false);
if (entering)
arrayindex++;
//lm.removeProximityAlert(proximityIntent);
}
The setProximityAlert () function is called if the position has
changed.
I develop the app with the emulator and Android SDK 1.5. I use the
console with geo fix commands to simulate gps data.
If you can see in this lines of code, I use an arrayIndex. I've save
all gps data of the gpx file in an array. If the handy is near the
first point, the ProximityAlert notify, that the handy enters this
position.
My problem is, that sometimes the ProximityAlert fires only one time,
sometimes 3 times or more.
I think the problem is the expiration time? But if I took a value like
2000 (2sec), the proximityAlert only works for 2 seconds?!
A solution can be, that I use multiple proximityIntents variables, so
that I save all proximityAlerts with addProximityAlert function only
once. But if I than enters the position of the third gps point before
the second or first point, the ProximityAlert will fire, but it
shouldn't before them!
What can I do? Must I implement a subactivity, which starts when I
entered the first position, than raise a counter and go back into the
main activity? I think the problem will be the same?
Greets,
Stefan
PS: I'm german, so apologize some mistakes. And this project is my
first in the Android world. So i'm not an expert..
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