Error when attempting to pass bundle, Android -

i attempting pass selected items on list new activity.

i declared arrayadapter

arrayadapter madapter

before oncreate; in onresume, collect data; , assign madapter

 //variable madapter             //new arrayadapter string             madapter = new arrayadapter<string>(                     searchingmidwife.this,                     android.r.layout.simple_list_item_checked,                     locations);             //set list display madapter 

and have this, should allow for, when listitem clicked, selected items variable, , pass new activity

 protected void onlistitemclick(listview l, view v, int position, long id) {         super.onlistitemclick(l, v, position, id);          //in checked, in listview item positions checked items         sparsebooleanarray checked = l.getcheckeditempositions();          //assign selected items new string arraylist         arraylist<string> selecteditems = new arraylist<string>();           //determine size of items checked (number)         (int = 0; < checked.size(); i++) {             // item position in adapter             position = checked.keyat(i);             // add location if checked i.e.) == true!             if (checked.valueat(i))                 //add selected items madapter                 selecteditems.add(madapter.getitem(position));         }          //create string output array, store new string array selected items         string[] outputstrarr = new string[selecteditems.size()];          (int = 0; < selecteditems.size(); i++) {             outputstrarr[i] = selecteditems.get(i);         }          intent intent = new intent(getapplicationcontext(),                 midwiferesultlist.class);          // create bundle object         bundle b = new bundle();           b.putstringarray("selecteditems", outputstrarr);          // add bundle intent.         intent.putextras(b);          // start resultactivity         startactivity(intent);       } 

i have result activity designed collect selected item , display it:

 protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_midwife_result_list);          bundle b = getintent().getextras();          string[] resultarr = b.getstringarray("selecteditems");          listview lv = (listview) findviewbyid(r.id.list);          arrayadapter<string> adapter = new arrayadapter<string>(this, android.r.layout.simple_list_item_1, resultarr);          lv.setadapter(adapter);       } 

when run program, can see listitem results, when select 1 program stops, , there error:

unable start activity componentinfo{android.bignerdranch.com.mobilemidwife/android.bignerdranch.com.mobilemidwife.midwiferesultlist}: java.lang.nullpointerexception: storage == null

pointing line of code:

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

the code seems right...why there null value on resultarr?

b.putstringarray("selecteditems", outputstrarr);  ...  string[] resultarr = b.getstringarray("selecteditems"); 

you have typo, in 1 place write "selecteditems" , in write "selecteditems". notice first letter capitalized in 1 not other. should change them same.