android - How to update list item in listview? -

i have listview smsarrayadapter of smsitem objects.

smsarrayadapter.java

public class smsarrayadapter extends arrayadapter<smsitem> 

i want update item of listview. why taking smsitem objects in onitemclick method , trying mark them read.

smsitem smsmessagestr = (smsitem) arrayadapter.getitem(pos);  if (smsmessagestr.status == false) {     ((smsarrayadapter) arrayadapter).setread(pos, smsmessagestr.id);       toast.maketext(this, "id " + smsmessagestr.id, toast.length_long).show();      arrayadapter.notifydatasetchanged(); } 

the method marking sms read follows declared in smsarrayadapter.java

public void setread(int position, string smsmessageid) {         smsbody.get(position).status = true;         smsitem smsitem = smsbody.get(position);         smsitem.status = true;         smsbody.set(position, smsitem);         contentvalues values = new contentvalues();         values.put("read", true);         int flag = context.getcontentresolver().update(uri.parse("content://sms/inbox"),             values, "_id=" + smsmessageid, null);     toast.maketext(context, "the result "+flag, toast.length_long).show();     } 

the sms not marking read. problem ?