android - Empty sqlite database when app send on another device -

i developing android app , have sqlite database in it. have inserted records in database. when sending app device there empty database!. please me

public void createprincipal(collegeprincipal principal){ sqlitedatabase db = getwritabledatabase();

    contentvalues values = new contentvalues();      values.put(princi_name, principal.getname());     values.put(princi_quali, principal.getqalification());     values.put(princi_intro, principal.getintro());      // insert row     long princi_id = db.insert(table_princi, null, values);      log.e("princi id", string.valueof(princi_id)); } 

when ever create data base in local store of device , , when transfer app wont care local data need store data variables in code in device.