In ListView wird nur erstes Element angezeigt?

<?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" >
    <TextView
        android:id="@+id/textViewRoomHeader"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceLarge" />
    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
        <LinearLayout
            android:id="@+id/linearLayoutRoom"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >
        </LinearLayout>
    </ScrollView>
</LinearLayout>

      TevtView titel = (TextView) findViewById(R.id.textViewRouteHeader);
      LinearLayout layout = (LinearLayout) findViewById(R.id.linearLayoutRoom);

      titel.setText(getString(R.string.current_room, floor.getName()));

      TextView tv = null;
      ListView lv = null;
      for (Room r : floor.getRooms())
      {
         tv = new TextView(this);

         tv.setText(r.getName());
         layout.addView(tv);
         tv.setTextAppearance(this, android.R.style.TextAppearance_Large);

         lv = new ListView(this);
         lv.setAdapter(new RoomListAdapter(r.getElements(), this));
         lv.setOnItemClickListener(new OnItemClickListener()
         {
            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3)
            {
               Toast.makeText(FloorActivity.this, "ID: " + arg3, Toast.LENGTH_SHORT).show();
            }
            
         });

         layout.addView(lv);
      }