main.py

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.scatter import Scatter
from kivy.uix.widget import Widget

Builder.load_string("""
<MainWidget>
	Picture:
		size_hint: None, None
		width: 500
		height: 500

		canvas.before:
			Color:
				rgba: 1, 0, 0, 1
			Rectangle:
				pos: self.pos
				size: self.size

		MyWidget:
			size_hint: None, None
			width: 200
			height: 200
			pos: self.parent.right - (self.width/2), self.parent.top - (self.height/2)
			
			canvas.before:
				Color:
					rgba: 0, 1, 0, 1
				Rectangle:
					pos: self.pos
					size: self.size
""")

class Picture(Scatter):
	def on_touch_down(self, touch):
		super(Picture, self).on_touch_down(touch)
		print("Picture:" )
		print("  self.pos: {}".format(self.pos))
		print("  self.size: {}".format(self.size))
		print("  touch.pos: {}".format(touch.pos))

class MyWidget(Widget):
	def on_touch_down(self, touch):
		print("MyWidget:")
		print("  self.pos: {}".format(self.pos))
		print("  self.size: {}".format(self.size))
		print("  touch.pos: {}".format(touch.pos))


class MainWidget(BoxLayout):
	def __init__(self, **kwargs):
		super(MainWidget, self).__init__(**kwargs)


class MyApp(App):
	def build(self):
		return MainWidget()


if __name__ == '__main__' or __name__ == 'android':
    MyApp().run()