title: Heap memory is not releasing down after calling "com.qoppa.notes.QPDFNotesView : releaseDocument()", using third party library "Qoppa"
body: <ul>
  <li><p>Opening Pdf using Qoppa library, specifically while debugging I can monitor heap memory usage becomes very high at below line executed..</p>
  
  <pre><code>     com.qoppa.notes.QPDFNotesView viewer = new QPDFNotesView(this);
  </code></pre></li>
  <li><p>Before going out my Activity, i am calling</p>
  
  <pre><code>     viewer.releaseDocument();
  </code></pre></li>
  <li><p>Even then heap memory is not coming down.</p></li>
  </ul>
  
  <p><strong>Note :</strong> Tried using latest qoppapdf.jar downloaded from qoppa as well.</p>