public synchronized void addDbAccessListener(DbAccessListener l) {
if (l == null) return;
if (dbAccessListeners == null) dbAccessListeners = new ArrayList<DbAccessListener>();
if (!dbAccessListeners.contains(l)) dbAccessListeners.add(l);
}
public synchronized void removeDbAccessListener(DbAccessListener l) {
if (dbAccessListeners != null && dbAccessListeners.contains(l)) dbAccessListeners.remove(l);
}