android - Listview not working properly -


i have listview in application. works fine when number of elements
increases on scrolling down , selecting view,it shows force close.
why so? code segment given as:

 lv1 = (listview) findviewbyid(r.id.listview);      lv1.setadapter(new arrayadapter<string>(this,r.layout.list_item,surveyname));     // lv1 = getlistview();      lv1.setonitemclicklistener(new onitemclicklistener() {            public void onitemclick(adapterview<?> arg0, view arg1, int arg2,              long arg3) {               listview lv = (listview) arg0;               textview tv = (textview) lv.getchildat(arg2);               string s = tv.gettext().tostring();               for(int i=0;i<ss;i++){                     if(surveyname[i].equals(s)){                         id=surveyid[i];                     }                 }                 intent j=new intent(surveytool.this,survey.class);                 bundle d=new bundle();                 d.putstring("surveyid", id);                 d.putstring("userid", userid);                 j.putextras(d);                 startactivity(j);             }  }); 

lv1.setadapter(new arrayadapter<string>(this,r.layout.list_item,surveyname));

replace line 

madapter = new arrayadapter<string>(this,android.r.layout.simple_list_item_1,surveyname);

hop working well...


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