title: Install / run (not: download) APK file directly from website
body: <p>I've seen <a href="https://stackoverflow.com/a/2328710/1469208">this answer</a>, but -- as it claims -- link starts download of <code>.apk</code> file, while I'm looking for any way to run it, if it is installed, directly from the web.</p>
  
  <p>I found <a href="https://testflightapp.com/androidsplash/" rel="nofollow noreferrer">this example</a> and TestFlight's webpage. There's a link <code>Already Installed? Launch the App</code> -- a simple <code>&lt;a&gt;</code> tag with <code>href</code> set to <code>testflightapp://com.testflightapp.androidapp?scheme=http&amp;amp;host=testflightapp.com&amp;amp;path=m/builds</code>.</p>
  
  <p>However, it seems, that this kind of href / protocol is supported only by installed Test Flight application and not available in general in Android system.</p>
  
  <p>Am I right, that my own application -- the one, that I want to run via link from website -- must itself register and handle private protocol, as in this example.</p>