title: Kivy crashes on resume after screen lock
body: <p>I'm writing my first app with Kivy and am using Buildozer to deploy the app to Android. Although my app resumes when I switch between applications, if ever I lock my screen, the app does not resume at all. </p>
  
  <p>Is there anything that I'm missing? The documentation seems to refer to this problem as a "bug" from previous versions. I'm using Kivy 1.10.0.</p>
  
  <p>Here is what I did to handle pause/resume:</p>
  
  <pre><code>class MyApp(App):
      def build(self):
          return sm
      def on_pause(self):
          return True
      def on_resume(self):
          return sm
  </code></pre>