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POAndroid - use attributes to tweak custom styles
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  1. POAndroid - use attributes to tweak custom styles
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    copied!<p>here's my issue. I have defined custom themes and styles, so as to customize various Views, in the relevant .xml files. Here are some code extracts:</p> <p>themes.xml:</p> <pre><code>... &lt;style name="Legacy" parent="android:Theme.NoTitleBar"&gt; &lt;item name="android:buttonStyle"&gt;@style/Legacy.Button&lt;/item&gt; ... &lt;/style&gt; </code></pre> <p>styles.xml:</p> <pre><code>... &lt;style name="Legacy.Button" parent="@android:style/Widget.Button"&gt; &lt;item name="android:textColor"&gt;#ffffff&lt;/item&gt; &lt;item name="android:background"&gt;@drawable/button_selector_blue&lt;/item&gt; &lt;item name="android:textSize"&gt;15dp&lt;/item&gt; &lt;/style&gt; </code></pre> <p>Let's say I set my application's theme to Legacy. If I use a Button in a layout, it will get my custom default parameters (white text, background is @drawable/button_selector_blue, etc).</p> <p>Now let's say I want to keep those parameters save for the text size: I'd like to have some buttons with a larger text size, which would be defined in an titleSize attribute in attrs.xml:</p> <pre><code>... &lt;attr name="titleSize" format="reference|dimension" /&gt; </code></pre> <p>and which value is set for each theme in my themes.xml file.</p> <p>So my layout would contain something like:</p> <pre><code>&lt;Button android:id="@+idmyButtonId" android:drawableRight="@drawable/aDrawable" android:text="@string/someText" android:textSize="?titleSize" android:layout_width="fill_parent" android:layout_height="wrap_content"&gt; &lt;/Button&gt; </code></pre> <p>When launching my app I get the following error: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x2</p> <p>So it seems I cannot tweak custom styles using attributes - at least not this way. Is such a thing possible ? If not, what would you use to achieve such a result ?</p> <p>I'd like to give the user the ability to select among different themes, so I can't just define an additionnal ButtonWithLargeText style and directly use it in my layout.</p> <p>Thanks for your help !</p>
 

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