java - Arraylist<Class> passing to another activity for adding objects in that activity returning 1st activity displaying them -

my first activity in have arraylist initialized , must passed custom array-adapter adding objects array list. here first activity.

public class ordersummary extends appcompatactivity {      arraylist<order> orderitems= new arraylist<>();      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.lview);          orderadapter orderarrayadapter = new orderadapter(this,orderitems);         listview listview = (listview) findviewbyid(r.id.satya);         listview.setadapter(orderarrayadapter);      }      public arraylist<order> getorderitem() {         return this.orderitems;     } } 

second activity custom adapter adding objects arraylist<custom class>. elements added on button click.

    final button buttonname = (button)       listitemview.findviewbyid(r.id.listitems_addcart);         if ( currentposition != null ) {             buttonname.settext(currentposition.getbuttonnname());             buttonname.setonclicklistener(new view.onclicklistener() {               private int index;               context context = getcontext();                @override               public void onclick(view v) {                   if ( currentposition.getcount() == 0 ) {                       order o = new order(currentposition.getmprice(), currentposition.getmitemname(), currentposition.updatecount());                       obj.getorderitem().add(o);                       index = obj.getorderitem().indexof(o);                       toast.maketext(context, "the" + currentposition.getmitemname() + currentposition.getcount() + "  no has been added", toast.length_short).show();                   } else {                      toast.maketext(context, " " + currentposition.getmitemname() + obj.getorderitem().get(index).updatequantity() + "  no has been added", toast.length_short).show();                    }               }           }        );        ...     } 

i used getter method passing arraylist custom adapter. output must when open first activity must show data added using button click initialized intents. full custom adapter code used display content in listview.

import java.util.arraylist;  import static satya_mydream.srkrcanteen.r.layout.word_items;  //custom word adapter used display , hanndle row_iem  class wordadapter extends arrayadapter<word> {     private  ordersummary obj = new ordersummary();      wordadapter(activity context, arraylist<word> items) {          super(context, 0, items);     }      @nonnull     @override     public view getview(int position, view convertview, @nonnull viewgroup parent) {         // check if existing view being reused, otherwise inflate view         view listitemview = convertview;         if ( listitemview == null ) {             listitemview = layoutinflater.from(getcontext()).inflate(                     word_items, parent, false);         }          // {@link androidflavor} object located @ position in list         final word currentposition = getitem(position);          // find textview in list_item.xml layout id version_name          // find textview in list_item.xml layout id version_number         final textview itemtextview = (textview) listitemview.findviewbyid(r.id.listitems_item);         // version number current androidflavor object ,         // set text on number textview           if ( currentposition != null ) {             itemtextview.settext(currentposition.getmitemname());         }           textview dollartextview = (textview) listitemview.findviewbyid(r.id.listitems_dollor);         // version number current androidflavor object ,         // set text on number textview          if ( currentposition != null ) {             dollartextview.settext(currentposition.getdollar());         }           final button buttonname = (button) listitemview.findviewbyid(r.id.listitems_addcart);         if ( currentposition != null ) {             buttonname.settext(currentposition.getbuttonnname());             buttonname.setonclicklistener(new view.onclicklistener() {                                              private int index;                  `enter code here`                               context context = getcontext();                                                @override                                               public void onclick(view v) {                                                   if ( currentposition.getcount() == 0 ) {                                                       order o = new order(currentposition.getmprice(), currentposition.getmitemname(), currentposition.updatecount());                                                       obj.getorderitem().add(o);                                                       index = obj.getorderitem().indexof(o);                                                       toast.maketext(context, "the" + currentposition.getmitemname() + currentposition.getcount() + "  no has been added", toast.length_short).show();                                                   } else {                                                      toast.maketext(context, " " + currentposition.getmitemname() + obj.getorderitem().get(index).updatequantity() + "  no has been added", toast.length_short).show();                                                    }                                               }                                            }              );         }         textview pricetextview = (textview) listitemview.findviewbyid(r.id.list_items_price);                 if ( currentposition != null )                 pricetextview.settext(currentposition.getmprice()+"");             /*find imageview in list_item.xml layout id list_item_icon         imageview iconview = (imageview) listitemview.findviewbyid(r.id.list_item_icon);          image resource id current androidflavor object ,          set image iconview         iconview.setimageresource(currentandroidflavor.getimageresourceid());           return whole list item layout (containing 2 textviews , imageview)          can shown in listview */         return listitemview;     }    }