title: how to specify width and height of a drawable item
body: <p>Hi is there anyway of providing width and height of a drawable defined in drawable.xml in drawable folder.</p>
  
  <p>Example:</p>
  
  <pre><code> &lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
       &lt;item android:state_pressed="true"
             android:drawable="@drawable/button_pressed" /&gt; &lt;!-- pressed --&gt;
       &lt;item android:state_focused="true"
             android:drawable="@drawable/button_focused" /&gt; &lt;!-- focused --&gt;
       &lt;item android:drawable="@drawable/button_normal" /&gt; &lt;!-- default --&gt;
   &lt;/selector&gt;
  </code></pre>
  
  <p>I wanted to specify width and height maybe somehow using "<strong>scale</strong>" tag inside it which i tried but didnt worked. This is my code:</p>
  
  <pre><code>&lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;item android:drawable="@drawable/icon_ratingstar"&gt;
          &lt;scale android:scaleWidth="20" android:scaleHeight="20" android:drawable="@drawable/icon_ratingstar" /&gt;
      &lt;/item&gt;
  &lt;/selector&gt;
  </code></pre>