public static final String OPT_TRANSACTION_LIST_STAMP = "transaction_list_last_update";
public static final String OPT_LAST_REFRESH = "last_refresh";
private static MobileLedgerDatabase helperForReading, helperForWriting;
public static final String OPT_TRANSACTION_LIST_STAMP = "transaction_list_last_update";
public static final String OPT_LAST_REFRESH = "last_refresh";
private static MobileLedgerDatabase helperForReading, helperForWriting;