title: Viewflipper listener for when next view is actually displayed
body: <p>I have 2 ExpandableListViews and I'm using a ViewFlipper to switch between them using a fling action. My flipper layout looks something like this</p>
  
  <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent" android:layout_height="fill_parent"&gt;
      &lt;ViewFlipper 
          android:id="@+id/flipper" 
          android:layout_width="fill_parent"      
          android:layout_height="fill_parent"&gt;
          &lt;LinearLayout 
              android:id="@+id/view1"
              android:orientation="vertical"&gt;
              &lt;ExpandableListView 
                  android:id="@id/android:list"
                  android:layout_width="fill_parent"
                  android:layout_height="fill_parent"
                  android:drawSelectorOnTop="false"/&gt;
              &lt;ImageView
                  android:id="@id/android:empty"
                  android:src="@drawable/logo"&gt;
             &lt;/ImageView&gt;
          &lt;/LinearLayout&gt;
          &lt;LinearLayout 
              android:id="@+id/view2"
              android:orientation="vertical"&gt;
              &lt;ExpandableListView 
                  android:id="@id/android:list"
                  android:layout_width="fill_parent"
                  android:layout_height="fill_parent"
                  android:drawSelectorOnTop="false"/&gt;
              &lt;ImageView
                  android:id="@id/android:empty"
                  android:src="@drawable/logo"&gt;
             &lt;/ImageView&gt;
          &lt;/LinearLayout&gt;
      &lt;/ViewFlipper&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>I want to automatically expand the first group in the list whenever the view is switched to
  so I switch to the next view and then I expand the first group if the view has any groups present. Something like this</p>
  
  <pre><code>public void switchNextView(){
      flipper.showNext();
      expandFirstGroup();       
  }
  
  public void expandFirstGroup(){
      LinearLayout layout = (LinearLayout)flipper.getCurrentView();
      ExpandableListView view = (ExpandableListView)layout.getChildAt(0);
  
      if(view.getChildCount() &gt; 0){
          view.expandGroup(0);
      }
  }
  </code></pre>
  
  <p>Now the problem is that getChildCount() always returns 0 the first time I'm switching to the next view which tells me that the the groups have still not been added to the ExpandableListView at this point</p>
  
  <p>In order to decide when the view was actually 'ready' I created an AnimationListener and called expandFirstGroup() in the onAnimationEnd()</p>
  
  <p>This seemed to be a workaround though since I might not always have/need an animation so my question is are there any better ways of doing this i.e. finding when the view is displayed or ready to be displayed?</p>