android - qpython kivy textinput and display -

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using qpython , kivy on android phone, i'm trying write program inputs text, processes , shows output. 

from kivy.app import app kivy.uix.button import button kivy.uix.textinput import textinput  class testapp(app):     def build(self)         r = textinput(multiline=false).text         y = self.dosomething(r)         return button(text = y)      def dosomething(self, x):         y = x + ' something'         return y  testapp().run

this fails - when push run doesn't ask input , display 'something'.

how fix can text input user?

edit replace build with:

def build(self):    def cb(instance, value):       print(value)    r = textinput(focus=true, multiline=false)    r.bind(text=cb)    return r


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