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    <p>I think the problem is caused by the manner you prepare the layouts in <code>prepareThemes()</code>.</p> <p>You didn't mention, but I assume your 'layout/widget_configure.xml' defines a structure like this:?</p> <pre><code>&lt;LinearLayout android:id="@+id/root"&gt; &lt;LinearLayout android:id="@+id/themeLayout&gt; &lt;!-- ... --&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:id="@+id/colorLayout&gt; &lt;!-- ... --&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:id="@+id/transpLayout&gt; &lt;!-- ... --&gt; &lt;/LinearLayout&gt; &lt;/LinearLayout&gt; </code></pre> <p>Then you inflate this in <code>prepareThemes()</code> to get the 3 sub layouts. But at this moment they are already registered as children of the surrounding layout (which I called "root"). As the error implies a <strong>view instance can be added to just one parent</strong>.</p> <p>You could store each LinearLayout in its own xml file and then inflate 3 times. Those stored layouts then could be add exactly once to a child.</p> <p>I'm not sure what you want to do, but I would guess, it would be better - instead of preparing - to just have 3 different layouts that include the part from <code>layout.itemrow</code> and then just make a <code>switch case</code> in <code>getChildView()</code> and inflate the needed layout on the fly. Because even when you store a not bind layout in prepareThemes: As soon as you have more then one group you would get the same error when adding a prestored layout to the child of the snd group.</p> <p>I hope this helps.</p>
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