android - Change CheckBox state on List item click? -

i have list , checkbox in every row of it. want whenever click on row, checkbox changes state accordingly.

checkbox.xml

<checkbox     android:id="@+id/checkbox"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:focusable="false"     android:text="" /> 

click listener list

protected void onlistitemclick(listview l, view v, int position, long id) {     toast.maketext(getapplicationcontext(), "you have selected item no."             + (position + 1) + "", toast.length_short).show();      super.onlistitemclick(l, v, position, id);     selectedrow = position;      if (v == null) {         layoutinflater lif = (layoutinflater) getsystemservice(context.layout_inflater_service);         v = lif.inflate(r.layout.posting_detail_question_row, null);     }      if (checkedtextview.ischecked()) {         toast.maketext(getapplicationcontext(), "already voted",                 toast.length_short).show();     } else {         string[] = {"option", "votes"}; // values fetch         // hashmap         int[] = {r.id.option, r.id.votes}; // id's view          simpleadapter adp = new simpleadapter(getapplicationcontext(),                 hashlist, r.layout.posting_detail_question_row, from, to);         setlistadapter(adp);         checkedtextview.setchecked(true);     } } 

posting_detail_question_row.xml

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="40dp"     android:orientation="vertical">      <linearlayout         android:layout_width="match_parent"         android:layout_height="fill_parent"         android:background="@drawable/poll_border_top_bg"         android:orientation="horizontal">          <textview             android:id="@+id/option"             android:layout_width="0dp"             android:layout_height="fill_parent"             android:layout_marginleft="10dp"             android:layout_weight=".3"             android:gravity="center_vertical"             android:text="answer 1"             android:textcolor="#333333"             android:textsize="15sp" />          <textview             android:id="@+id/votes"             android:layout_width="0dp"             android:layout_height="fill_parent"             android:layout_marginleft="10dp"             android:layout_weight="1"             android:gravity="center_vertical"             android:textcolor="#333333"             android:textsize="15sp" />          <checkbox             android:id="@+id/checkbox"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:focusable="false"             android:text="" />     </linearlayout> </linearlayout> 

my adapter simpleadapter:

    simpleadapter adp = new simpleadapter(getapplicationcontext(),             hashlist, r.layout.posting_detail_question_row, from, to);     log.v("mylog", "after simple adapter");     setlistadapter(adp); 

you need use findviewbyid pointer checkbox:

protected void onlistitemclick(listview l, view v, int position, long id) {      toast.maketext(getapplicationcontext(), "you have selected item no."                  +(position+1)+"", toast.length_short).show();      super.onlistitemclick(l, v, position, id);      if (v != null) {         checkbox checkbox = (checkbox)v.findviewbyid(r.id.checkbox);         checkbox.setchecked(!checkbox.ischecked());     } } 

if recieving onclick event v should never null have put on appropriate checks.