[Android] Listview - problem z višino vrstice

Pozdravljeni,
zadnja dva dni se ubadam s sledečim problemom. Vrstica v Listview-u je vedno tako velika, kakor da bi nastavil lastnost vrstice layout_height = "wrap_content". Listview napolnim s custom adapterjem. Spodaj prilagam tudi del testne kode, ki mi dela probleme. Kot lahko vidite spodaj, bi morala moja vrstica biti visoka 150dp, vendar temu ni tako. Vse druge lastnoti vrstice, kot so barva texta, ozadje, padding itd. pa dela popolnoma normalno. V čem je torej trik?

hvala, lp

test.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

activity class

@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.test);
		lv = (ListView) findViewById(R.id.listView1);

		array = new ArrayList<String>();
		array.add("prvi");
		array.add("drugi");
		array.add("tretji");
		array.add("Četrti");
		array.add("peti");
		array.add("šesti");

		CustomListViewAdapter adapter = new CustomListViewAdapter(this, array);
		lv.setAdapter(adapter);
		
	}

CustomListViewAdapter

public class CustomListViewAdapter extends BaseAdapter {

	private ArrayList<String> data;
	private Context context;
	LayoutInflater inflater;

	public CustomListViewAdapter(Context c, ArrayList<String> result) {
		this.data = result;
		this.context = c;
	}
        .
        .
        .
	public View getView(int position, View convertView, ViewGroup parent) {
		
		this.inflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		
		String s = data.get(position);

		View vi = convertView;
		if (convertView == null)
			vi = inflater.inflate(R.layout.list_row, null);

		TextView tv = (TextView) vi.findViewById(R.id.tv1);
		tv.setText(s);

		return vi;
	}

}

List_row.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/krneki"
    android:layout_width="fill_parent"
    android:layout_height="150dp" 
    android:background="@android:color/white">

    <TextView
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:textColor="@color/dark_grey"
        android:textSize="@dimen/normal_Text" />

    <Button
        android:id="@+id/btnArrow"
        android:layout_width="18dp"
        android:layout_height="18dp"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:background="@drawable/arrow" />

</RelativeLayout>

O super... minHeight reši celotno zadevo :)
hvala