In attr.xml, using value = "" returns null instead of empty string, why?
<p>I'm using attr.xml to extend ProgressBar and define a few attributes. 
Sadly, using</p>

<p>
</p>

<pre><code>&lt;declare-styleable name="TextProgressBar"&gt;
    &lt;attr name="text" format="string" value = "" /&gt;
    &lt;attr name="text_color" format="color" /&gt;
    &lt;attr name="text_size" format="dimension" /&gt;
&lt;/declare-styleable&gt;
</code></pre>

<p></p>

<p>then setText(a.getString(R.styleable.TextProgressBar_text)) in my custom class will return "null" instead of "empty string". (a being my attribute set of course).</p>

<p>The documentation is empty regarding this subject.</p>

<p>Thank you</p>
