title: How to get drawable metadata from manifest file to android library project
body: <p>I have an android library project which will handle push notifications. This library have its fcm receiver that will generate the notification on the behalf of the application which is using this library. 
  Here, in the applications Manifest.xml, I am adding notification icon as meta data as follows.</p>
  
  <pre><code>&lt;meta-data
          android:name="notification_big_icon"
          android:value="@drawable/ic_launcher" /&gt;
  
      &lt;meta-data
          android:name="notification_small_icon"
          android:value="@drawable/ic_launcher" /&gt;
  </code></pre>
  
  <p>I want to parse this these drawable resources into the library project and set the notification icons. How can I achieve this.</p>