title: How to open installed apk by URL link?
body: <p>I want to do something like this:</p>
  
  <p>click a Link (a URL of apk)</p>
  
  <ol>
  <li><p>If the apk didn't install before, so the apk will be downloaded.</p></li>
  <li><p>If the apk have installed the apk before, the apk will be open.</p></li>
  </ol>
  
  <p>So is it possible to open the apk by URL link?</p>