title: kivy app shows black screen on android phone
body: <p>The kivy app that I have coded up won't work on my samsung galaxy s10e but will work on my computer. Maybe I need to add somthing to my .spec file but I dont know</p>
  <p>Here is the code for the app:</p>
  <pre><code>import kivy
  kivy.require('2.1.0')
  from kivy.app import App
  from kivy.uix.label import Label
  from kivy.uix.boxlayout import BoxLayout
  import random
  class MyRoot(BoxLayout):
      def __init__(self):
          super(MyRoot, self).__init__()
  
  
      def generate_number(self):
          self.random_label.text = str(random.randint(0, 1000))
  
  
  
  class randomnumber(App):
  
      def build(self):
          return MyRoot()
  
  randomint = randomnumber()
  randomint.run()
  </code></pre>