Map<Integer, GeoPoint> mapPoints = new HashMap<Integer, GeoPoint>();
ArrayList<Integer> keys2 = new ArrayList<Integer>(mapPoints.keySet());

for (int t =0; t < 50; t ++){

            Collections.shuffle(keys2);

        }

Map<Integer, GeoPoint> mapPoints = new HashMap<Integer, GeoPoint>();
System.out.println("before shuffle ");
Set<Integer> keys = mapPoints.keySet();
for (int key : keys) {
    System.out.println("key : " + key + " value: " + mapPoints.get(key));
}
Collections.shuffle(keys);  // don't know why multiple shuffles are required.  deck of cards?
System.out.println("after shuffle ");
for (int key : keys) {
    System.out.println("key : " + key + " value: " + mapPoints.get(key));
}