Database Handler in Realm for Android -

i trying implement realm in android. there way implement database handler in sqlite? every samples found in ui , under button clicks. there no pure implementation on seperate database file.

i have database handler class below:

public class databasehandler extends sqliteopenhelper {    private static final int database_version = 1; private static final string database_name = "mytrain"; private static final string table_route = "route"; private static final string column_id = "id"; private static final string column_routename = "routename"; private static final string column_remarks = "remarks";  public databasehandler(context context) {     super(context, database_name, null, database_version); }  @override public void oncreate(sqlitedatabase db) {  string create_route_table = "create table if not exists "        + table_route + "("+column_id+" integer primary key,"        + column_routename+" text,"+column_remarks+" text)";  db.execsql(create_route_table); }   @override public void onupgrade(sqlitedatabase db, int oldversion, int newversion) {     db.execsql("drop table if exists " + table_route);     oncreate(db); }  //to insert data public void addroute(int id, string routename, string remarks) {     sqlitedatabase sqlitedatabase = this.getwritabledatabase();     contentvalues contentvalues = new contentvalues();     contentvalues.put(column_id, id);     contentvalues.put(column_routename, routename);     contentvalues.put(column_remarks, remarks);     sqlitedatabase.insert(table_route, column_id, contentvalues);     sqlitedatabase.close(); }  //other crud operation functions lies here.... } 

i want make similar functions , database handler class dedicated database stuffs..
so, how implement similar feature in realm database..