Android :: ListView Not Responding To Click Or Key Press

I have a simple ListView in my layout.xml file.

<ListView android:id="@+id/action_list"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />..........

And in my javacode, I add a setOnItemClickListener() to my listview:
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
System.out.println ("get onItem Click position= "+position);}});

But when I run on G1. I don't see any print out when I click an item on the ListView on the phone.Or when I select an item using track ball and press CENTER.