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copied!<p>Case A is a reference to a style attribute. It allows you to reference a particular piece of style information without knowing its actual value. There are a lot of Android-defined attributes that are used to style the Android UI, but you can also define you own attributes.</p> <p><a href="http://developer.android.com/reference/android/R.attr.html#actionBarItemBackground" rel="nofollow"><code>actionBarItemBackground</code></a> is one such attribute. There are two ways you can use this attribute:</p> <ol> <li><p>You can reference it to make the look and feel of UI elements consistent with action bar items:</p> <pre class="lang-xml prettyprint-override"><code><com.mycompany.MyView android:id="@+id/myView" android:background="?attr/actionBarItemBackground"/> </code></pre></li> <li><p>You can define a theme and set the value of this attribute to override the default L&F for your app:</p> <pre class="lang-xml prettyprint-override"><code><style name="MyTheme" parent="@android:style/Theme"> <item name="android:actionBarItemBackground">#383c44</item> </style> </code></pre></li> </ol> <p>Here are some pointers to the Android documentation:</p> <p>For styles an themes see:<br> <a href="http://developer.android.com/guide/topics/ui/themes.html" rel="nofollow">http://developer.android.com/guide/topics/ui/themes.html</a>.</p> <p>For a list of all attributes see:<br> <a href="http://developer.android.com/reference/android/R.attr.html" rel="nofollow">http://developer.android.com/reference/android/R.attr.html</a></p> <p>For defining your own attributes there is no documentation. Have a look at one of the <code>attrs.xml</code> files in the SDK (e.g. under <code>platforms\android-17\data\res\values</code>) to see how style attributes are declared. You can declare attributes in the same way by putting an <code>attrs.xml</code> file in your <code>res\values</code> folder. You can then use these attributes in your own styles and themes.</p>

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