Adding multiple proximity alerts to location manager

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http://stackoverflow.com – i am having trouble with adding more then one proximity alert to my location listener. i already searched the internet but found nothing helpful. please let me know if i am doing some thing wrong . here is my code snippet locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); locationManager.addProximityAlert(30.0, 70.0, 1000, -1, PendingIntent.getActivity(Map.this, 0, new Intent(android.content.Intent.ACTION_VIEW,Uri.parse("http://www.google.com")), 0)); locationManager.addProximityAlert(40.0, 50.0, 1000, -1, PendingIntent.getActivity(Map.this, 10, new Intent(a (HowTos)