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    <p>To hopefully explain, take a look at the <a href="http://developer.android.com/guide/topics/fundamentals/fragments.html#Design">Design Philosophy</a> for Fragments in the Dev Guide.</p> <p>If you look at the image, to the left it shows how a phone would show an intial Activity A which would then start Activity B when an item in a list is selected.</p> <p>To the right, however, it is showing how those two Activities can be shown as Fragments at the same time. Notice Fragment A is taking 1/3 of the screen and Fragment B is filling 2/3 of the screen.</p> <p>Now look at the XML for that layout from <a href="http://developer.android.com/guide/topics/fundamentals/fragments.html#Adding">Adding a fragment to an activity</a> from the same Dev Guide article...</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent"&gt; &lt;fragment android:name="com.example.news.ArticleListFragment" android:id="@+id/list" android:layout_weight="1" android:layout_width="0dp" android:layout_height="match_parent" /&gt; &lt;fragment android:name="com.example.news.ArticleReaderFragment" android:id="@+id/viewer" android:layout_weight="2" android:layout_width="0dp" android:layout_height="match_parent" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>You can see that both Fragments have a <code>layout_width</code> of 0dp but they also each have a <code>layout_weight</code> attribute. The first has a weight of 1 and the second a weight of 2.</p> <p>In short, when using a layout like this, setting the 'width' to be 0 means you don't want to explicitly enforce a width and that the OS should work out the relative widths as fractions of total weight. In other words 1+2=3 (total weight) but the first Activity wants a width of 1 / total weight = 1/3 of the screen width and Fragment B wants 2 / total width = 2/3 of the screen width.</p> <p>Now suppose you add a third fragment which also has width=0dp and weight=2. In this case, the total weight is 1+2+2=5 and the first fragment will have a relative width of 1/5 and the other two fragments 2/5 of the screen or 20% / 40% / 40%.</p>
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    1. POWhy android:layout_width=”0px” for fragments?
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    1. POWhy android:layout_width=”0px” for fragments?
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    1. COThe answer can't be more clear than yours, thanks! :)
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    2. COGlad I could help.
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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.

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