title: Start whatsapp from webview
body: <p>I have an app that loads a newspaper site in a webview. In that site you can share a news in facebook, twitter and whatsapp. I have facebook's and twitter's links covered with </p>
  
  <pre><code>shouldOverrideUrlLoading()
  </code></pre>
  
  <p>I can't figer out how to launch the whatsapp app. It uses a custom URL scheme:</p>
  
  <pre><code>whatsapp://send?text=
  </code></pre>
  
  <p>I get: the webpage at whatsapp://send?text= could not be loaded because:</p>
  
  <pre><code>net::ERR_UNKNOWN_URL_SCHEME
  </code></pre>