android - How to use R to select a ListView when using it with ListActivity -

i have code:

public class myactivity extends listactivity implements onclicklistener {     private arraylist<string> listitems = new arraylist<string>();     arrayadapter<string> adapter;      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          this.setadapter();         this.bindbuttons();     }     private void setadapter() {         setcontentview(r.layout.siteactivity);         adapter=new arrayadapter<string>(this,                 r.layout.siteitem,                 listitems);         setlistadapter(adapter);     }     private void bindbuttons() {         findviewbyid(r.id.buttonprevious).setonclicklistener(this);         findviewbyid(r.id.buttonnext).setonclicklistener(this);     }     // ... } 

with layout:

<?xml version="1.0" encoding="utf-8"?> <relativelayout   xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="match_parent"   android:layout_height="match_parent" android:id="@+id/siteactivity"> <linearlayout     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:id="@+id/navigation">     <button         android:text="&lt;="         android:textsize="12dp"         android:id="@+id/buttonprevious"         android:layout_width="wrap_content"         android:layout_height="wrap_content">     </button>     <button         android:text="=&gt;"         android:textsize="12dp"         android:id="@+id/buttonnext"         android:layout_width="wrap_content"         android:layout_height="wrap_content">     </button> </linearlayout> <listview      android:id="@android:id/list"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_below="@+id/navigation"      android:layout_above="@+id/transport_selection"      /> </relativelayout> 

note android:id="@android:id/list" of listview. if replace android:id="@+id/list", activity force closes, because "content must have listview id attribute 'android.r.id.list'", expected behaviour, think.

now, want add context menu items of listview. tryed registerforcontextmenu(findviewbyid(r.id.list));, doesn't work, because of android:id.

then, how can add context menu?

regards,

as using listactivity, can use following code list view in code:

listview mylistview=getlistview ();