android - Why don't active contextual action bar when check the checkbox on the listview? -

i want show custom action bar when checkbox checked in listview. wrote 1 xml file type of menu this:

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android" >      <item         android:id="@+id/delete"         android:title="actionbar"         android:icon="@drawable/recycle"/>  </menu> 

i use custom listview codes:

private class adapter_collection extends arrayadapter<string> {  public adapter_collection(context context, int resource, int textviewresourceid,         string[] name_collection_tbl_collection) {     super(context, resource, textviewresourceid, name_collection_tbl_collection); }  @override public view getview(int position, view convertview,  viewgroup parent) {      layoutinflater inflater = (layoutinflater) getsystemservice(context.layout_inflater_service);     view row = inflater.inflate(r.layout.listview_items, parent, false);     textview txt_item_list_collection = (textview)row.findviewbyid(r.id.textview_item_listview);     checkbox checkbox=(checkbox)row.findviewbyid(r.id.checkbox_item_listview);      checkbox.settag(position);     checkbox.setoncheckedchangelistener(new oncheckedchangelistener() {                  @override         public void oncheckedchanged(compoundbutton buttonview, boolean ischecked ) {                if (mactionmode!=null) {                 myactionmodecallback callback = new myactionmodecallback();                 mactionmode = startactionmode(callback);             }                  //toast.maketext(getapplicationcontext(), buttonview.gettag().tostring() , toast.length_short).show();               }     });     txt_item_list_collection.settext(name_collection_tbl_collection[position]);     return row; } 

}

i add class use contextual action bar :

    private class myactionmodecallback implements actionmode.callback {      @override     public boolean onactionitemclicked(actionmode mode, menuitem item) {         // todo auto-generated method stub         return false;     }      @override     public boolean oncreateactionmode(actionmode mode, menu menu) {         mode.getmenuinflater().inflate(r.menu.actionbar_menu, menu);         return true;     }      @override     public void ondestroyactionmode(actionmode mode) {         mactionmode = null;     }      @override     public boolean onprepareactionmode(actionmode mode, menu menu) {         // todo auto-generated method stub         return false;     } } 

now when check checkboxes in listview , action bar don't changed . please advice.

this problem solved change :

 checkbox.setoncheckedchangelistener(new oncheckedchangelistener() {              @override     public void oncheckedchanged(compoundbutton buttonview, boolean ischecked ) {                 myactionmodecallback callback = new myactionmodecallback();             mactionmode = startactionmode(callback);               //toast.maketext(getapplicationcontext(), buttonview.gettag().tostring() , toast.length_short).show();           } });