title: ListView inside ViewPager won't scroll when applying a PageTransformer
body: <p>I have a ViewPager in which the pages contain ListViews. 
  Everything works fine and my viewPAger as well as ListViews work as expected : it is possible to swipe from page to page, and the listviews scroll vertically as they should. </p>
  
  <p>Now I wanted to add a PageTransformer to smooth out paging anbd I used the <a href="http://developer.android.com/training/animation/screen-slide.html#zoom-out" rel="nofollow">ZoomOutPageTransformer</a> offered in the google docs.</p>
  
  <p>Now I have a nice animation when swiping between views but the Lists are not scrollable anymore. </p>
  
  <p>Here's the code : </p>
  
  <pre><code>@Override
  public void onViewCreated(View view, Bundle savedInstanceState) {
      super.onViewCreated(view, savedInstanceState);
      LayoutInflater inflater = LayoutInflater.from(getActivity());
      viewPager = (ViewPager) view.findViewById(R.id.bookMenuPager);
      viewPager.setPageTransformer(false, new ZoomOutPageTransformer());
      pagerAdapter = new MenuPagerAdapter();
      viewPager.setAdapter(pagerAdapter);
  }
  
  
  class MenuPagerAdapter extends PagerAdapter{
  
      @Override
      public int getCount() {
  
          return 3; //change this as needed
      }
  
      @Override
      public boolean isViewFromObject(View view, Object o) {
          return view.equals( o );
      }
  
      @Override
      public Object instantiateItem(ViewGroup collection, int position) {
          LayoutInflater inflater = (LayoutInflater) collection.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  
          if(position == 0){
              if(!rootMenuAdded){
                  viewPager.addView(rootMenucont, 0);
                  rootMenuAdded = true;
              }
              return rootMenucont; 
          }else if(position == 1){
              if(!level1MenuAdded){
                  viewPager.addView(level1MenuCont, 0);
                  level1MenuAdded = true;
              }
              return level1MenuCont;
          }else if(position == 2){
              if(!level2MenuAdded){
                  viewPager.addView(level2MenuCont, 0);
                  level2MenuAdded = true;
              }
              return level2MenuCont;
          }
  
          //we got a problem houston
          return null;
      }
   }
  </code></pre>
  
  <p>and the layout for a page : </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/level1MenuCont"
  android:layout_height="match_parent"
  android:layout_width="match_parent"
  &gt;
  
  &lt;ListView
      android:id="@+id/level1Menu"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent" 
      android:background="#f02bb6"
      &gt;
  &lt;/ListView&gt;
  
  &lt;/RelativeLayout&gt; 
  </code></pre>
  
  <p>What can I do to have my lists scrolling as expected ? What does the PageTransformer break in my ListView so that it wont scroll anymore? 
  Is this a known bug?</p>
  
  <p>Thanks for any help :)</p>