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POMulti-layered ExpandableListView
 

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    <p>I'm currently working on a project in which I need something like the following:</p> <pre><code>- MainGroup 1 (Expandable) - SubGroup 1 (Expandable) - SubSubGroup 1 (Expandable) - Child View - Child View - ... - SubSubGroup 2 (Expandable) - Child View - Child View - ... - SubGroup 2 (Expandable) - SubSubGroup 3 (Expandable) - Child View - ... - SubSubGroup 4 (Expandable) - Child View - ... - SubGroup 3 (Expandable) - Child View - ... - MainGroup 2 (Expandable) - ... </code></pre> <p>At most it would be an <code>ExpandableListView</code> inside an <code>ExpandableListView</code> inside an <code>ExpandableListView</code> - so 3 layers of <code>ExpandableListView</code>:</p> <ul> <li><code>MainGroup</code> would only hold other <code>ExpandableListView</code>.</li> <li><code>SubGroup</code> would hold other <code>ExpandableListView</code> except for the last two, which will allways just be <code>ChildViews</code>. (I'm thinking those two could just be substituted with the one for <code>SubSubGroup</code>)</li> <li><code>SubSubGroup</code> would allways hold <code>ChildViews</code>.</li> </ul> <p>My problem is that I think I fail to understand the basic principles of how the <code>ExpandableListView</code> layouts it's children. I've looked at examples like <a href="http://mylifewithandroid.blogspot.com/2011/02/3-level-expandable-lists.html">this</a>, but can't get my head around the functionality.</p> <p>I've tried simply adding an <code>ExpandableListView</code> as a child in another - but something doesn't work as only the first item of the inner <code>ExpandableListView</code> is visible if you expand one of the outer groups. I can however by setting the height of the outer groups container manually make it big enough to show all items in the inner <code>ExpandableListView</code>. To be optimal, calculation of height should of course be done on the fly.</p> <p>So, to get to some more solid questions:</p> <ul> <li>Can someone give me an explanation of the <code>ExpandableListView</code> "lifecycle" (by this I mean instantation, re-use of views, expand/collapse listeners) including: <ul> <li>How and when is an <code>ExpandableListView</code> notified that a child is expanded/collapsed?</li> <li>How does the <code>ExpandableListView</code> know how much space to make for all children to fit into a group container?</li> </ul></li> <li>How much benefit is there in using the <code>ExpandableListView</code> to create the above, compared to just mixing together my own solution using some <code>LinearLayouts</code> and some <code>OnClickListeners</code>?</li> </ul> <hr> <p><strong>Edit</strong></p> <p>For my last question I might note that there can be anywhere from 1 to 20+ <code>MainGroups</code>.</p>
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