lback"><span class="type-annotation"><a href="dart-ui/PlatformMessageCallback.html">PlatformMessageCallback</a></span> <span class="parameter-name">callback</span></span>)</span>
                  
</section>
        
                        <section class="summary source-code" id="source">
          <h2><span>Implementation</span></h2>
          <pre class="language-dart"><code class="language-dart">set onPlatformMessage(PlatformMessageCallback callback) {
  _onPlatformMessage = callback;
  _onPlatformMess