java - Android: Null object reference -

i trying have list of contacts, each quickcontactbadge. when tried add quickcontactbadge, application crasher , logcat says null object reference on mcursor when call getcolumnindex();. doing wrong, , code work correctly implement quickcontactbadge?

private cursoradapter madapter; private cursor mcursor; private string currentquery; private int midcolumn; private int mlookupkeycolumn; private uri mcontacturi; private quickcontactbadge mbadge; private static final string[] projection = {         contacts._id,         contacts.display_name_primary,         contacts.lookup_key,         contacts.photo_thumbnail_uri,         contacts.has_phone_number }; private static final string[] = { contacts.display_name_primary }; private static final int[] = { r.id.contact_text }; private static final string selection = "(" + contacts.in_visible_group +         " = 1) , (" + contacts.has_phone_number + " != 0 )";   @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      mcursor = null;     madapter = new simplecursoradapter(getactivity(), r.layout.contacts_list_item, mcursor, from, to, 0);      mbadge = (quickcontactbadge) getactivity().findviewbyid(r.id.badge);     midcolumn = mcursor.getcolumnindex(contacts._id);     mlookupkeycolumn = mcursor.getcolumnindex(contacts.lookup_key);     mcontacturi =             contacts.getlookupuri(                     mcursor.getlong(midcolumn),                     mcursor.getstring(mlookupkeycolumn)             );     mbadge.assigncontacturi(mcontacturi); } 

mcursor = null; madapter = new simplecursoradapter(getactivity(), r.layout.contacts_list_item, mcursor, from, to, 0);  mbadge = (quickcontactbadge) getactivity().findviewbyid(r.id.badge); midcolumn = mcursor.getcolumnindex(contacts._id); 

check first , last line here... mcursor null, , calling getcolumnindex() on it.