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copied!<p>Take a look at the error message and then take a look at your <code>onCreateView()</code>-method. The error message says you're trying to add a <code>View</code> to a parent, that <em>already has</em> a parent.</p> <p>The reason you're getting the <code>IllegalStateException</code> is because you're trying to add <code>(ViewGroup) container</code> as a child to itself by <code>return</code>-ing <code>container</code> in your <code>onCreateView(...)</code>. Of course <code>container</code> already has a parent, which is why you got the error.</p> <p>Also, the part about the adapter in onCreateView() can throw an error, since your <code>ListFragment</code> doesn't have an adapter yet until you set one. The call to <code>((ImageAdapter) getListAdapter())</code> will (probably) return null, causing <code>.getImageDownloader()</code> to (probably) throw a <code>NullPointerException</code>. Try the following in your <code>Fragment</code>:</p> <pre><code>@Override public void onActivityCreated(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // You should choose what mode you want, // ImageDownloader.Mode.NO_ASYNC_TASK or // ImageDownloader.Mode.CORRECT;... no use in setting it, just // to override it again 1 line later :p ImageDownloader.Mode mode = ImageDownloader.Mode.NO_ASYNC_TASK; mode = ImageDownloader.Mode.CORRECT; ImageAdapter mImageAdapter = new ImageAdapter(); mImageAdapter.setMode(mode); setListAdapter(mImageAdapter); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { v = inflater.inflate(R.layout.imagelist, container, return v; // notice you're returning your inflated View here, // instead of container } </code></pre> <hr> <h2>Update</h2> <p>Also, change your <code>ListActivity</code> to an <code>Activity</code> (or <code>FragmentActivity</code> if you use the support library). Remove the call to <code>setListAdapter(new ImageAdapter());</code> from your <code>Activity</code>, and move the <code>implements RadioGroup.OnCheckedChangeListener</code> to the <code>ListFragment</code>.</p>

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