/** Drops underlying database table using DAOs. */
 public static void dropAllTables(SQLiteDatabase db, boolean ifExists) {
   UserFriendsDao.dropTable(db, ifExists);
 }
 /** Creates underlying database table using DAOs. */
 public static void createAllTables(SQLiteDatabase db, boolean ifNotExists) {
   UserFriendsDao.createTable(db, ifNotExists);
 }