title: Android databinding set padding if value is true
body: <p>I want to be able to to be able to set padding values if a boolean is true. The problem is that Android studio cannot parse the layout because it thinks 2dp is a decimal with a value of 2 and then doesn't know what to do with the p. how do I format this so that it understands i mean 2 density pixels.</p>
  
  <p>Data layout:</p>
  
  <pre><code>&lt;data class=".ItemBinding"&gt;
      &lt;variable name="isGroupType" type="Boolean"/&gt;
  &lt;/data&gt;
  </code></pre>
  
  <p>View layout(whats important):</p>
  
  <pre><code>&lt;android.support.v7.widget.AppCompatImageView
              android:layout_width="64dp"
              android:layout_height="64dp"
              android:paddingBottom='@{isGroupType ? 2dp : 0dp}'
              android:paddingTop='@{isGroupType ? 8dp : 0dp}'
              android:paddingRight='@{isGroupType ? 2dp : 0dp}'
              android:paddingLeft='@{isGroupType ? 2dp : 0dp}'/&gt;
  </code></pre>