java - Saving the state of a single spinner with different uses -

please have spinner in customadapterclass extends arrayadapter. want save state of spinner when activity destroyed. 1 spinner appears in listview. have searched see when there more 1 spinner, each having it's own id. how achieve please. here code

public class customlistadapterforcgpa extends arrayadapter<string> implements adapterview.onitemselectedlistener {  linearlayout colorlayout; textview usergpscoreuneditable; spinner spinnerforgradepoints; public string mathsubject= "mathematics"; public string chemsubject = "chemistry"; public string physicssubject = "physics"; public string biologysubject = "biology"; public string gssubject = "general studies"; public string cscsubject = "csc"; sharedpreferences sharedpreferences; sharedpreferences.editor editor;   public customlistadapterforcgpa(context context, arraylist<string> subjects) {     super(context, r.layout.custom_list_view_cgpa, subjects); }  @override public void onitemselected(adapterview<?> adapterview, view view, int i, long l) {  }  @override public void onnothingselected(adapterview<?> adapterview) {  }  @nonnull @override public view getview(int position, view convertview, viewgroup parent) {     layoutinflater layoutinflater = layoutinflater.from(getcontext());     view customview = layoutinflater.inflate( r.layout.custom_list_view_cgpa,parent,false);      string singlesubject = getitem(position);       textview singletext = (textview) customview.findviewbyid(r.id.listsubjectsmycoursescgpa);     colorlayout = (linearlayout)customview.findviewbyid(r.id.colorforsubjectscgpa);     usergpscoreuneditable = (textview)customview.findviewbyid(r.id.usergpscoreuneditable);     spinnerforgradepoints = (spinner)customview.findviewbyid(r.id.spinnerforgradepointcgpa);      arrayadapter<string> gradepointadapter = new arrayadapter<string>(getcontext(), android.r.layout.simple_spinner_dropdown_item, tabfirstsemestermycgpa.usersubjectgrade);     spinnerforgradepoints.setadapter(gradepointadapter);      spinnerforgradepoints.setonitemselectedlistener(new adapterview.onitemselectedlistener() {         @override         public void onitemselected(adapterview<?> adapterview, view view, int i, long l) {             string selecteditem = adapterview.getitematposition(i).tostring();               if (selecteditem.equals("a"))             {                 toast.maketext(getcontext(), "you clicked a", toast.length_short).show();             }else if ( selecteditem.equals("b"))             {                 toast.maketext(getcontext(), "you clicked b", toast.length_short).show();              }else if ( selecteditem.equals("c"))             {                 toast.maketext(getcontext(), "you clicked c", toast.length_short).show();              }else if ( selecteditem.equals("d"))             {                 toast.maketext(getcontext(), "you clicked d", toast.length_short).show();               }else if ( selecteditem.equals("e"))             {                 toast.maketext(getcontext(), "you clicked e", toast.length_short).show();              }else if ( selecteditem.equals("f"))             {                 toast.maketext(getcontext(), "you clicked f", toast.length_short).show();              }          }          @override         public void onnothingselected(adapterview<?> adapterview) {          }     });       singletext.settext(singlesubject);     colorlayout.setbackgroundcolor(usercourseselection2.usersubjectslistcolor.get(position));        return customview;    }   } 

in pure java save state static field. value persist after activity destroyed because belongs class, not instance. should work same in android.