title: how to launch an android app with custom url scheme
body: <p>I want to launch my app from a custom URL scheme. I checked the deep links section on dev android and here is a snippet of my code. This doesnt seem to fire though with a URL that looks like : myApp://?host=myhost.com</p>
  
  <p>Manifest :</p>
  
  <pre><code>&lt;intent-filter&gt;
      &lt;action android:name="android.intent.action.MAIN" /&gt;
  
      &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
      &lt;category android:name="android.intent.category.BROWSABLE" /&gt;
  
      &lt;data android:scheme="myApp" /&gt;
  &lt;/intent-filter&gt;
  </code></pre>
  
  <p>In the activity which is my main activity, i have :</p>
  
  <pre><code>Intent intent = getIntent();
  Uri uri = intent.getData();
  if (uri != null) {
      String host = uri.getQueryParameter("host");
  }
  </code></pre>
  
  <p>The app does not launch when i have email that has the url as a hyperlink.
  Also, what would be a good way to test this ?</p>