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    <p>If you have to expand only 2 views, then perhaps you can use a simple trick to achieve this without <code>ExpandableListView</code>. Just define the layout of every category and subcategory in a <code>LinearLayout</code> oriented <code>vertically</code>, with the the visibility of subcategories by default to be <code>gone</code>. </p> <pre><code>&lt;LinearLayout android:id="@+id/category1" //....&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:id="@+id/subcategory1" android:visibility="gone" //....&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:id="@+id/category2" //....&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:id="@+id/subcategory2" android:visibility="gone" //....&gt; &lt;/LinearLayout&gt; </code></pre> <p>Set a click listener for each category, and when a category is clicked change its visibility: to <code>visible</code> if it's <code>gone</code>, and to <code>gone</code> if it's <code>visible</code>.</p> <p>A pseudo cod will look like this:</p> <pre><code>ViewGroup category1 = findViewById(category1); ViewGroup subcategory1 = findViewById(subcategory1); category1.setOnClickListener(new OnClickListener(){ public void onClick(){ toogle(); } }); //...... void toogle(){ if(subcategory1 is visible){ subcategory1.visibility = "gone" }else{ subcategory1.visibility = "visible" } } </code></pre> <p>In case in the future the requirements will change and you'll have to add more categories, then perhaps the <code>ExpandableListView</code> would make more sense, but for now you can achieve the desired effect with this simple trick.</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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