ListView in Android, handler for clicking item -

i have activity in android uses listview. when click on item in listview, able determine item clicked. have following code:

@override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setrequestedorientation (activityinfo.screen_orientation_portrait);      setcontentview(r.layout.listr);     //setupdb();      //populatelist3();    listview lv = (listview) findviewbyid(r.id.listview01);    lv.setclickable(true);     lv.setonitemclicklistener(new onitemclicklistener() {     public void onitemclick(adapterview<?> parent, view view, int position, long id) {               toast.maketext(listrecords.this,"clicked!", toast.length_long).show();        }    }); 

}

my layout.xml:

<?xml version="1.0" encoding="utf-8"?>   <linearlayout       xmlns:android="http://schemas.android.com/apk/res/android"         android:id="@+id/linear03lr"      android:layout_width="fill_parent"        android:orientation="vertical"        android:gravity="center"      android:layout_height="fill_parent">      <!--put form controls here-->       <listview android:id="@+id/listview01"   android:layout_width="wrap_content"  android:layout_height="400dp" />       <button         android:id="@+id/previousbutton"         android:gravity="center_horizontal"         android:layout_width = "fill_parent"         android:layout_height = "fill_parent"          android:text="previous menu"/> </linearlayout>   

what missing here able intercept clicks on listview?

it might easier use listactivity, have over-ride onlistitemclick.