public void addMarker(GeoPoint point) {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_HHmmss");
Date date = new Date();
mMarkerOverlay.addItem(point, "marker" + dateFormat.format(date), "snippet");
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(MAP_POINTS, getMarkerJson());
editor.commit();
}
public String getMarkerJson() {
return mMarkerOverlay.getJSON();
}