How to call an added image in android? -


i have written code. have 4 images called. 3 images running in emulator.

the other image not visible.

please let me know why image not being called correctly?

package com.mobility.visiontest.ui;  import com.mobility.visiontest.r;  import android.app.alertdialog; import android.content.dialoginterface; import android.content.intent; import android.os.bundle; import android.view.motionevent; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.imageview; import android.widget.textview; public class duochrometest extends uiscreenactivity {      private boolean islefteye = false;     private boolean isrighteye = false;     private int correctanscount = 0;     private int tapcount = 0;     private int testcount = 1;     private int images[] = {r.drawable.d1,r.drawable.d2,r.drawable.d3,r.drawable.d4,r.drawable.dc1};     private int dtest_image;     @override     protected void oncreate(bundle savedinstancestate) {         // todo auto-generated method stub         super.oncreate(savedinstancestate);         setcontentview(r.layout.duochrome_image);         imageview image = (imageview) findviewbyid(dtest_image);         button button= (button) findviewbyid(r.id.button1);         button.setonclicklistener(new onclicklistener()         {@override     public void onclick(view arg0) {             // todo auto-generated method stub             resetview();         } });     }        public void resetview(){         setcontentview(r.layout.duochrometest);         setobjects();         int a[] = { r.id.lefteye, r.id.righteye };         setonclicklistener(a);                  }       @override     public void onclick(view v) {         // todo auto-generated method stub         switch (v.getid()) {         case r.id.lefteye:         case r.id.righteye:             resettestview(r.layout.duochrome_layout);             break;         case r.id.option1:         case r.id.option2:         case r.id.option3:         case r.id.option4:             ++tapcount;             if(v instanceof button){                 button button =(button)v;             if(button.gettext().equals(getstring(r.string.clearboth) )||                     button.gettext().equals(getstring(r.string.yes))){                 ++correctanscount;             }             }             updatequestionandanswers();             break;         case r.id.testagain:             ++testcount;             resetview();             break;         case r.id.backtotests:             backtotests();             break;         default:             break;         }     }        private void resettestview() {         // todo auto-generated method stub      }      private void backtotests() {         // todo auto-generated method stub         intent = new intent();         i.setclassname(getapplicationcontext(),getstring(r.string.tests));         startactivity(i);         finish();      }        private void updatequestionandanswers() {         // todo auto-generated method stub         if(tapcount == 3){ //          textview question = (textview)findviewbyid(r.id.question);              ((textview)findviewbyid(r.id.question)).settext(r.string.duochromequestion2);              ((button)findviewbyid(r.id.option1)).settext(r.string.clearred);             ((button)findviewbyid(r.id.option2)).settext(r.string.cleargreen);             ((button)findviewbyid(r.id.option3)).settext(r.string.notvisible);              ((button)findviewbyid(r.id.option4)).setvisibility(view.invisible);         }else if(tapcount > 3){             showresult();         }else{              ((imageview)findviewbyid(r.id.imageview)).setimageresource(images[tapcount]);         }     }      private void showresult() {         // todo auto-generated method stub setcontentview(r.layout.duochrometestresult);          int a[] = { r.id.testagain, r.id.backtotests};         setonclicklistener(a);          string result = null;          if(correctanscount < 4 ){             result = getstring(r.string.duochromeresult2);             if(testcount == 2 ){                 result = getstring(r.string.duochromeresultiteration1);                 ((button)findviewbyid(r.id.testagain)).setvisibility(view.invisible);                 testcount =1 ;             }         }else if( correctanscount == 3){             result = getstring(r.string.duochromeresult1);             ((button)findviewbyid(r.id.testagain)).setvisibility(view.invisible);     }          ((textview)findviewbyid(r.id.atresult)).settext(result.replace("%d", string.valueof(correctanscount)+"/3"));             correctanscount = 0;             tapcount = 0;     }       // resets vision acuity test view         private void resettestview(int layout) {             setcontentview(layout);             ((imageview)findviewbyid(r.id.imageview)).setimageresource(images[tapcount]);             int a[] = { r.id.option1, r.id.option2, r.id.option3, r.id.option4 };             setonclicklistener(a);         }      @override     public boolean ontouch(view v, motionevent event) {         // todo auto-generated method stub         return false;     }      @override     public void setobjects() {         // todo auto-generated method stub     }      // mainmenu.     private void backtomain() {         intent = new intent();         i.setclassname(getapplicationcontext(), getstring(r.string.tests));         startactivity(i);         finish();     }      @override     public void onbackpressed() {         // todo auto-generated method stub         // super.onbackpressed();          alertdialog dialog = null;         alertdialog.builder builder = new alertdialog.builder(this);         // add buttons         builder.setpositivebutton(r.string.yes,                 new dialoginterface.onclicklistener() {                     public void onclick(dialoginterface dialog, int id) {                         // user clicked ok button                         backtomain();                     }                 });         builder.setnegativebutton(r.string.no,                 new dialoginterface.onclicklistener() {                     public void onclick(dialoginterface dialog, int id) {                         // user cancelled dialog                         dialog.dismiss();                     }                 });          builder.setmessage(getstring(r.string.exittest));         dialog = builder.create();         dialog.show();      }  }

i think in if(tapcount == 3){ condition not using 

((imageview)findviewbyid(r.id.imageview)).setimageresource(images[tapcount]);

now changing stings not showing image 4


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