android - Title of ContextMenu from ListView item -


i trying set title of contextmenu selected item in listview. everytime run on emulator, crashes , have force close it. ddms shows uncaught java.lang.nullpointerexception thrown. there problem dbtest.java class? have defined database operations in dbtest.java class.

note: exception thrown on line :-

cursor mcursor = (cursor) getlistadapter().getitem(info.position);

please have @ code , point out bugs.

package com.tintin.prototype_2;  import android.app.listactivity; import android.content.intent; import android.database.cursor; import android.os.bundle; import android.support.v4.widget.simplecursoradapter; import android.util.log; import android.view.contextmenu; import android.view.contextmenu.contextmenuinfo; import android.view.view; import android.view.view.onclicklistener; import android.widget.adapterview; import android.widget.button; import android.widget.listview;  public class contact_la extends listactivity {  dbtest db; simplecursoradapter dataadapter;  protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.check);     db = new dbtest(this);     displaylist(); }  public void onresume(){     cursor newcursor = db.getallcontacts();     dataadapter.changecursor(newcursor);     super.onresume(); }  public void displaylist(){     cursor cursor = db.getallcontacts();     string columns[] = new string[] {db.name, db.number};     int to[] = new int[] {r.id.textview1, r.id.textview2};     dataadapter = new simplecursoradapter(this, r.layout.check_layout, cursor, columns, to, 0);     //listview lv = (listview) findviewbyid(r.id.list);     listview lv = getlistview();     lv.setadapter(dataadapter);     registerforcontextmenu(lv);      button b = (button) findviewbyid(r.id.addcontact);      b.setonclicklistener(new onclicklistener() {          @override         public void onclick(view arg0) {             startactivity(new intent(contact_la.this, contact_add.class));         }     });     db.close(); }  public void oncreatecontextmenu(contextmenu menu, view v, contextmenuinfo menuinfo){     super.oncreatecontextmenu(menu, v, menuinfo);     adapterview.adaptercontextmenuinfo info;     try{         info = (adapterview.adaptercontextmenuinfo) menuinfo;     }catch(classcastexception e){         log.v("bad", "bad info");         return;     }     cursor mcursor = (cursor) getlistadapter().getitem(info.position);     if(mcursor == null)return;     menu.setheadertitle(mcursor.getstring(mcursor.getcolumnindex("name")));     menu.add(0, v.getid(), 0, "delete"); } }

try this

try{         info = menuinfo.getmenuinfo();; } catch(classcastexception e){         log.v("bad", "bad info");         return; }

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