title: Kivy/pyjnius: get android.app.Application object of my app
body: <p>Testflight api needs pointer to <code>android.app.Application</code> object for API methods like this:</p>
  
  <pre><code>TestFlight.takeOff(this, "your-token-***-***-***")
  </code></pre>
  
  <p>how can I get it for my kivy <code>App</code> object?</p>