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    <p>Bit annoying that I've just done it, but here is a method of doing it using the built-in Spinner in the action bar. All you need to do is make your spinner item's main container a <code>RelativeLayout</code> and set its gravity to fillHorizontal, like so:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/RelativeLayout1" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="fill_horizontal" android:orientation="vertical" &gt; &lt;TextView android:id="@android:id/text1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginBottom="-4dip" android:text="@string/gen_placeholder" android:textAppearance="?android:attr/textAppearanceMedium" /&gt; &lt;TextView android:id="@+id/TextView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@android:id/text1" android:text="@string/app_name" android:textAppearance="?android:attr/textAppearanceSmall" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>And initialising the Adapter as so:</p> <pre><code>ArrayAdapter&lt;CharSequence&gt; barAdapter = new ArrayAdapter&lt;CharSequence&gt;(this, R.layout.subtitled_spinner_item, android.R.id.text1, getResources().getStringArray(R.array.actionList)); barAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); </code></pre> <p>which then gives the required spinner spanning the entire actionbar (except for the action buttons): </p> <p><img src="https://i.stack.imgur.com/8RBGW.png" alt="Spanned actionbar"></p>
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    1. COCan you expand on what you mean by setting the spinner item's "main container"? Any chance you could give an example of how you added the above layout?
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    2. COI mean the enclosing layout of your spinner item. The xml code above generates the full-width spinner as shown.
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    3. COSo do you need a custom adapter to go with this?
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