[android-developers] ProximityAlert "problem"

[Stefan]

hello,

i am developing a navigation software. I read some gps points out  of
a gpx file. Now i want to know, if i am near a gps point (for example
50m). So i use the addProximityAlert function.
My problem is the order. I start with the first gps point, so i only
want to know, if i am near the first point. after i am near this point
i want to check, if i am near this point and so on. And after i was
near the first point, i want to delete this from the proximityAlert
function.
My code:

after i have read the gps points, i start the setProximityAlert
function the first time:

private void setProximityAlert()
    {
        if(arrayindex!=lat_w.length)
        {
                lati = lat_w[arrayindex];
                lng = lon_w[arrayindex];

                intent.putExtra("pos", arrayindex);
                proximityIntent = PendingIntent.getBroadcast
(getApplicationContext(), arrayindex, intent, 0);

                lm.addProximityAlert(lati, lng, radius, expiration,
proximityIntent);

                IntentFilter filter = new IntentFilter
(TREASURE_PROXIMITY_ALERT);
                registerReceiver(new ProximityIntentReceiver(), filter);
        }
        else
                Toast.makeText(getBaseContext(),
                              "End of Tour :)",
                              Toast.LENGTH_SHORT).show();
    }

    /** Proximity Alert Broadcast Receiver */
    public class ProximityIntentReceiver extends BroadcastReceiver
{
          @Override
          public void onReceive (Context context, Intent intent) {
            String key = LocationManager.KEY_PROXIMITY_ENTERING;
            entering = intent.getBooleanExtra(key, false);
            int pos = intent.getIntExtra("pos", 0);


            Toast.makeText(NavTrack.this, "Treasure: " + entering + "
Position" +
             String.valueOf(pos), Toast.LENGTH_LONG).show();

            //only the next gps point!!!
            if (entering && old_pos+1 == pos)
            {
                old_pos=pos;
                arrayindex++; //for the setProximityAlert function
                Toast.makeText(getBaseContext(),
                      "Arrayindex: "+String.valueOf(arrayindex),
                      Toast.LENGTH_LONG).show();

                lm.removeProximityAlert(proximityIntent); //hmmm, it seems,
this doesnt work (because the toast
                                                                               
//
above shows several time position 0 or 1 or 2 and so on)
                                                                                
//
Because of that the workaround with  if(... old_pos+1..)

                  setProximityAlert
();                                 //set the next gps point from file
to addProximityAlert
            }
}

I think this is a very dirty code. The best way would be, if i could
use a for-loop where i set all proximityAlerts and than check if i am
near the first point, after that the second point and so on...

So is this possible and does the removeProximityAlert do the right job
(delete the proximity alerts for the checked gps point)???

Thanks,
Stefan
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