java - content provider -

i had created class extends contentprovider. had override 6 functions

@override public uri insert(uri uri, contentvalues initialvalues) {      contentvalues values;     if(initialvalues != null){         values = new contentvalues(initialvalues);     }else{         values = new contentvalues();     }     sqlitedatabase mdb = mdbhelper.getwritabledatabase();     long rowid = mdb.insert(databasehelper.table_program, null, values);     if(rowid > 0){         uri programuri = contenturis.withappendedid(null, rowid);         getcontext().getcontentresolver().notifychange(programuri, null);         return programuri;     }     throw new illegalargumentexception("failed insert row " + uri); }  private void createdata(){     string = "a", b = "b", c = "c", d= "d";     //how going call content provider let me add in data? } 

my question how call insert() add data?

obtain contentresolver instance via getcontentresolver() insert method.

update that's best tutorial