android - Retrieving Parse ObjectID in OnTimeClickListener method -

i want retrieve objectid of item (to specific, it's class called "room" in our parse model) clicked within listview. , after that, want pass retrieved objectid class using intent.

i tried parse docs' getobjectid(); method seems won't work. how should retrieve it?

here's code.

button createbtn; button searchbtn; button mygroupbtn; button settingbtn;   string[] courses; list<string> listitems; arrayadapter<string> adapter; listview listview; textview textview; // when creat button tapped public void createbtn(view view){     intent = new intent(getapplicationcontext(), create.class);     // removes animation     i.addflags(intent.flag_activity_no_animation);     startactivity(i); } // when setting button tapped public void settingbtn(view view) {     intent = new intent(getapplicationcontext(), setting.class);     // removes animation     i.addflags(intent.flag_activity_no_animation);     startactivity(i); } @override protected void oncreate(bundle savedinstancestate) {     intent intent = getintent();     string coursename = intent.getstringextra("coursename");     string coursenumber = intent.getstringextra("coursenumber");      super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_search_result);     // making links buttons on create     createbtn = (button) findviewbyid(r.id.createbtn);     searchbtn = (button) findviewbyid(r.id.searchbtn);     mygroupbtn = (button) findviewbyid(r.id.mygroupbtn);     settingbtn = (button) findviewbyid(r.id.settingbtn);       //chaning button colors     searchbtn.settextcolor(0xffffffff);     createbtn.settextcolor(0xffbfbfbf);     mygroupbtn.settextcolor(0xffbfbfbf);     settingbtn.settextcolor(0xffbfbfbf);      listview= (listview)findviewbyid(r.id.listview);     textview= (textview)findviewbyid(r.id.textview2);     textview.settext(coursename + " " + coursenumber);      listitems = new arraylist<>();       parsequery<parseobject> roomquery = parsequery.getquery("room");     roomquery.whereequalto("course" , coursename);     roomquery.whereequalto("number" , coursenumber);      roomquery.findinbackground(new findcallback<parseobject>() {         @override         public void done(list<parseobject> objects, parseexception e) {              if (e == null) {                 (parseobject room : objects) {                      log.i("appinfo", string.valueof(room.get("title")));                     string stringtoadd = "";                      string opened = string.valueof(room.get("opened"));                     string x;                     if(opened.equals(true)){                         x = "open";                     }else{                         x = "closed";                     }                      stringtoadd = stringtoadd + string.valueof(room.get("studydate")) + "   " +                             string.valueof(room.get("category")) + "    " + x + "\n"                             + string.valueof(room.get("title")) +                             "            "                     ;                     listitems.add(stringtoadd);                     log.i("appinfo", "a");                 }               } else {                 log.i("appinfo", "b");                 e.printstacktrace();             }          }     });     initlist();  } public void initlist() {      log.i("appinfo", "c");        adapter = new arrayadapter<string>(this, r.layout.list_two, r.id.txtvw, listitems);     listview.setadapter(adapter);     listview.setonitemclicklistener(this);   }   @override public void onitemclick(adapterview<?> parent, view view, int position, long id) {     intent intent = new intent(getapplicationcontext(), room.class);     string category = listitems.get(position); } 

}

your problem loose objectid of parse in "adapter": use strings , basic android adapter (there: new arrayadapter<string>(this, r.layout.list_two, r.id.txtvw, listitems);) display elements; problem converting complicated room object string not contain lot of informations makes loose objectid want keep.

the solution problem android-ish pattern called adapter or more case custom adapter explain device how render room elements every cell of app's listview.

it extremely documented (much better possibility write in post) here generic official doc , here is, me, the best tutorial concept.

ps: beginner, recommend base adapter, is, me, simplest :)