java - Sending data from activity to class -

i need guys. i'm making quiz i'm stuck. first of got activity can choose between categories:

package com.laurenswuytsjordipapen.cultural.pursuit;  import android.app.activity; import android.content.intent; import android.content.sharedpreferences; import android.os.bundle; import android.preference.preferencemanager; import android.view.view; import android.widget.button;  import com.laurenswuytsjordipapen.cultural.pursuit.library.userfunctions;  public class dashboardactivity extends activity {     userfunctions userfunctions;     button btnlogout;     button btneuropa;     button btnamerika;     button btnafrika;     button btnazie;     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          /**          * dashboard screen application          * */                 // check login status in database         userfunctions = new userfunctions();         if(userfunctions.isuserloggedin(getapplicationcontext())){             setcontentview(r.layout.dashboard);             btnlogout = (button) findviewbyid(r.id.btnlogout);             btneuropa = (button) findviewbyid(r.id.btneuropa);             btnamerika = (button) findviewbyid(r.id.btnamerika);             btnafrika = (button) findviewbyid(r.id.btnafrika);             btnazie = (button) findviewbyid(r.id.btnazie);              btnlogout.setonclicklistener(new view.onclicklistener() {                  public void onclick(view arg0) {                     // todo auto-generated method stub                     userfunctions.logoutuser(getapplicationcontext());                     intent login = new intent(getapplicationcontext(), loginactivity.class);                     login.addflags(intent.flag_activity_clear_top);                     startactivity(login);                     // closing dashboard screen                     finish();                 }             });             btneuropa.setonclicklistener(new view.onclicklistener() {                  public void onclick(view arg0) {                      intent start = new intent(getapplicationcontext(), mainactivity.class);                     start.putextra("continent","europa");                     startactivity(start);                     // closing dashboard screen                     finish();                 }             });             btnamerika.setonclicklistener(new view.onclicklistener() {      public void onclick(view arg0) {          intent start = new intent(getapplicationcontext(), mainactivity.class);         start.putextra("continent","amerika");         startactivity(start);         // closing dashboard screen         finish();     } }); btnafrika.setonclicklistener(new view.onclicklistener() {      public void onclick(view arg0) {          intent start = new intent(getapplicationcontext(), mainactivity.class);         start.putextra("continent","afrika");         startactivity(start);         // closing dashboard screen         finish();     } }); btnazie.setonclicklistener(new view.onclicklistener() {      public void onclick(view arg0) {          intent start = new intent(getapplicationcontext(), mainactivity.class);         start.putextra("continent","azie");         startactivity(start);         // closing dashboard screen         finish();     } });            }else{             // user not logged in show login screen             intent login = new intent(getapplicationcontext(), loginactivity.class);             login.addflags(intent.flag_activity_clear_top);             startactivity(login);             // closing dashboard screen             finish();         }         } } 

and go quiz = mainactivity. send intent mainacitivty knows category is:

package com.laurenswuytsjordipapen.cultural.pursuit; import java.util.list;  import com.laurenswuytsjordipapen.cultural.pursuit.library.userfunctions;  import android.os.bundle; import android.preference.preferencemanager; import android.app.activity; import android.content.intent; import android.content.sharedpreferences; import android.util.log; import android.view.menu; import android.view.view; import android.widget.button; import android.widget.radiobutton; import android.widget.radiogroup; import android.widget.textview; public class mainactivity extends activity {     userfunctions userfunctions;     button btnlogout;     list<vragen> queslist;     int score=0;     int qid=0;     vragen currentq;     textview txtvraag;     radiobutton rda, rdb, rdc;     button butvolgende;     string value;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          bundle extras = getintent().getextras();         if (extras != null) {          value = extras.getstring("continent");         }            dbhelper db=new dbhelper(this);         queslist=db.getallquestions();         currentq=queslist.get(qid);         txtvraag=(textview)findviewbyid(r.id.txtvraag);         rda=(radiobutton)findviewbyid(r.id.antwoord1);         rdb=(radiobutton)findviewbyid(r.id.antwoord2);         rdc=(radiobutton)findviewbyid(r.id.antwoord3);         butvolgende=(button)findviewbyid(r.id.btnvolgende);         setquestionview();         butvolgende.setonclicklistener(new view.onclicklistener() {                   public void onclick(view v) {                 radiogroup grp=(radiogroup)findviewbyid(r.id.grpantwoord);                 radiobutton answer=(radiobutton)findviewbyid(grp.getcheckedradiobuttonid());                 log.d("yourans", currentq.getanswer()+" "+answer.gettext());                 if(currentq.getanswer().equals(answer.gettext()))                 {                     score++;                     log.d("score", "your score"+score);                 }                 if(qid<10){                          currentq=queslist.get(qid);                     setquestionview();                 }else{                     intent intent = new intent(mainactivity.this, resultactivity.class);                     bundle b = new bundle();                     b.putint("score", score); //your score                     intent.putextras(b); //put score next intent                     startactivity(intent);                     finish();                 }             }         });     }     @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.activity_main, menu);         return true;     }     private void setquestionview()     {         txtvraag.settext(currentq.getquestion());         rda.settext(currentq.getopta());         rdb.settext(currentq.getoptb());         rdc.settext(currentq.getoptc());         qid++;     } } 

but questions in class dbhelper:

package com.laurenswuytsjordipapen.cultural.pursuit; import java.util.arraylist; import java.util.list; import android.content.contentvalues; import android.content.context; import android.database.cursor; import android.database.sqlite.sqlitedatabase; import android.database.sqlite.sqliteopenhelper; public class dbhelper extends sqliteopenhelper {      private static final int database_version = 1;     // database name     private static final string database_name = "dbquiz";     // tasks table name     private static final string table_quest = "quest";     // tasks table columns names     private static final string key_id = "id";     private static final string key_ques = "question";     private static final string key_answer = "answer"; //correct option     private static final string key_opta= "opta"; //option     private static final string key_optb= "optb"; //option b     private static final string key_optc= "optc"; //option c     private sqlitedatabase dbase;     public dbhelper(context context) {         super(context, database_name, null, database_version);     }     @override     public void oncreate(sqlitedatabase db) {          dbase=db;         string sql = "create table if not exists " + table_quest + " ( "                 + key_id + " integer primary key autoincrement, " + key_ques                 + " text, " + key_answer+ " text, "+key_opta +" text, "                 +key_optb +" text, "+key_optc+" text)";         db.execsql(sql);                 addquestions();         //db.close();     }         private void addquestions()     {          vragen q1=new vragen("op welke hooglanden draven er wilde rendieren rond in groot brittanie?","andes gebergte", "schotse hooglanden", "britse hooglanden", "schotse hooglanden");         this.addvraag(q1);         vragen q2=new vragen("in welke italiaanse stad zijn de ponte vechio en het palazzo medici belangrijke bezienswaardigheden??", "milan", "rome", "firenze", "firenze");         this.addvraag(q2);         vragen q3=new vragen("wat het favoriete land van een gallomaan?","frankrijk", "egypte", "duitsland", "frankrijk");         this.addvraag(q3);         vragen q4=new vragen("welke europese hoofdstad net zoals rome op zeven heuvels gebouwd?", "brussel", "parijs", "rome", "brussel");         this.addvraag(q4);         vragen q5=new vragen("wat naast vaticaanstad, monaco, san marino en andorra het vijfde europese ministaatje?","corsica", "luxemburg", "lichtenstein", "lichtenstein");         this.addvraag(q5);         vragen q6=new vragen("aan welke golf ligt de kuststreek tussen marseille en perpignan?", "golf van frankrijk", "golf van lyon", "middellandse zee", "golf van lyon");         this.addvraag(q6);         vragen q7=new vragen("welke nationaliteit heeft hordeloper jonathan n senga?","belgische", "canadees", "ganees", "belgische");         this.addvraag(q7);         vragen q8=new vragen("welke munt werd de alpendollar genoemd?", "oostenrijkse shilling", "bulgaarse lef", "franse frank", "oostenrijkse shilling");         this.addvraag(q8);         vragen q9=new vragen("aan welke natie gaf zanzibar zich in 1896 on na exact 38 minuten oorlog voeren?","engeland", "china", "amerika", "engeland");         this.addvraag(q9);         vragen q10=new vragen("welke stad telde als eerste in de geschiedenis meer dan 1 miljoen inwoners?", "rome", "tokyo", "kopenhagen", "rome");         this.addvraag(q10);     }     @override     public void onupgrade(sqlitedatabase db, int oldv, int newv) {         // drop older table if existed         db.execsql("drop table if exists " + table_quest);         // create tables again         oncreate(db);     }     // adding new question     public void addvraag(vragen quest) {         //sqlitedatabase db = this.getwritabledatabase();         contentvalues values = new contentvalues();         values.put(key_ques, quest.getquestion());          values.put(key_answer, quest.getanswer());         values.put(key_opta, quest.getopta());         values.put(key_optb, quest.getoptb());         values.put(key_optc, quest.getoptc());         // inserting row         dbase.insert(table_quest, null, values);             }     public list<vragen> getallquestions() {         list<vragen> queslist = new arraylist<vragen>();         // select query         string selectquery = "select  * " + table_quest;         dbase=this.getreadabledatabase();         cursor cursor = dbase.rawquery(selectquery, null);         // looping through rows , adding list         if (cursor.movetofirst()) {             {                 vragen quest = new vragen();                 quest.setid(cursor.getint(0));                 quest.setquestion(cursor.getstring(1));                 quest.setanswer(cursor.getstring(2));                 quest.setopta(cursor.getstring(3));                 quest.setoptb(cursor.getstring(4));                 quest.setoptc(cursor.getstring(5));                 queslist.add(quest);             } while (cursor.movetonext());         }         // return quest list         return queslist;     }     public int rowcount()     {         int row=0;         string selectquery = "select  * " + table_quest;         sqlitedatabase db = this.getwritabledatabase();         cursor cursor = db.rawquery(selectquery, null);         row=cursor.getcount();         return row;     } } 

i need somehow put intent got in mainativity class dbhelper. can make if , else clausules questions. know how can send intent "continent" mainactivity dbhelper :)

thanks in advance!

yes, can send data. think best solution giving in dbhelper constructor.