android - How to move to a new activity after the finishing the quiz? -

i'm making android quiz app , seems it's done except adding questions there still big error. see i've put random generater generates 4 questions. when answer fourth new activity starts display of score. instead app doesn't respond. i'm clueless.

thank you!

package com.matej.hajdukkviz;  import java.util.arraylist; import java.util.collections; import java.util.list; import java.util.random; import android.os.bundle; import android.app.activity; import android.graphics.color; import android.view.view; import android.view.window; import android.view.windowmanager; import android.view.view.onclicklistener; import android.widget.button; import android.widget.textview;  public class glavno extends activity implements onclicklistener {  int score  = 0;  textview textview1, textview2, textview3, countdown; button btn1, btn2, btn3, btn4;  arraylist<question> qsts = new arraylist<question>(); list<integer> generated = new arraylist<integer>();  arraylist<string> allanswers = new arraylist<string>();  random rng = new random(); question nextquestion;  question q1 = new question(         "q1",          "correct answer - q1",         "wrong answer 1 - q1",         "wrong answer 2 - q1",         "wrong answer 3 - q1"         ); question q2 = new question(         "q2?",          "correct answer - q2",         "wrong answer 1 - q2",         "wrong answer 2 - q2",         "wrong answer 3 - q2"         ); question q3 = new question(         "q3?",          "correct answer - q3"         "wrong answer 1 - q3",         "wrong answer 2 - q3",         "wrong answer 3 - q3"         );  question q4 = new question(         "q4?",          "correct answer - q4",         "wrong answer 1 - q4",         "wrong answer 2 - q4",         "wrong answer 3 - q4"         );  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     requestwindowfeature(window.feature_no_title);     getwindow().setflags(windowmanager.layoutparams.flag_fullscreen, windowmanager.layoutparams.flag_fullscreen);      setcontentview(r.layout.pitanja);  // add questions in arraylist qsts      qsts.add(q1);                qsts.add(q2);     qsts.add(q3);     qsts.add(q4);      textview1 = (textview) findviewbyid(r.id.textview1);     textview2 = (textview) findviewbyid(r.id.textview2);     textview3 = (textview) findviewbyid(r.id.textview3);     countdown = (textview) findviewbyid(r.id.countdown);      textview3.settext("rezultat: " + score);          btn1 = (button) findviewbyid(r.id.btn1);         btn2 = (button) findviewbyid(r.id.btn2);         btn3 = (button) findviewbyid(r.id.btn3);         btn4 = (button) findviewbyid(r.id.btn4);          btn1.setonclicklistener(this);         btn2.setonclicklistener(this);         btn3.setonclicklistener(this);         btn4.setonclicklistener(this);      generatequestion();  }      public void generatequestion(){          while(true){              int nxt = rng.nextint(4);              if (!generated.contains(nxt)){                  generated.add(nxt);                  nextquestion = qsts.get(nxt);                  textview1.settext(nextquestion.questiontext);                  allanswers.add(nextquestion.correctanswertext);                 allanswers.add(nextquestion.wronganswer1);                 allanswers.add(nextquestion.wronganswer2);                 allanswers.add(nextquestion.wronganswer3);                  collections.shuffle(allanswers);                  btn1.settext(allanswers.get(0));                 btn2.settext(allanswers.get(1));                 btn3.settext(allanswers.get(2));                 btn4.settext(allanswers.get(3));                  break;             }         }     }       @override     public void onclick(view v) {         button b = (button)v;         string buttontext = b.gettext().tostring();          if(buttontext.equals(nextquestion.correctanswertext)) {               textview2.settext("toČno!");             textview2.settextcolor(color.green);             textview3.settext("rezultat: " + (score += 10));              allanswers.clear();             generatequestion();              return;          }else{              textview2.settext("netoČno!");             textview2.settextcolor(color.red);             textview3.settext("rezultat: " + (score -= 5));              allanswers.clear();             generatequestion();              return;          }      }    

}

in generatequestion() looping while true (which case) , execute if random question has not been shown. of course endless loop. if 4 questions, can declare global variable counter increase after each question. , instead of looping while true if counter < 4 else startnewintent() or similar code mentioned codemagic.