Kivy Beginner, use on_motion for accelerometer

[Nick S]

Hi Peeps,

I'm just starting out with Kivy. I want to get motion sensor data on an android phone and I was thinking that I could use on_motion for this but I can't seem to get it to fire. I've had success with on_touch_down etc, but can't get anything out of on_motion.

My code is below. Am I implementing on_motion wrong? Do I need to investigate something like plyer? Thanks in advance.

from kivy.app import App

from kivy.uix.gridlayout import GridLayout

from kivy.uix.label import Label

from kivy.core.window import Window

class MyGrid(GridLayout):

    def __init__(self, **kwargs):

        super(MyGrid, self).__init__(**kwargs)

        self.cols = 1

        self.size_hint = (0.6, 0.7)

        self.pos_hint = {"center_x":0.5, "center_y":0.5}

        #add widgets to window   

        self.greeting = Label(text="Ready...")

        self.add_widget(self.greeting)

    def on_motion(self, eType, me, **kwargs):

        self.greeting.text = "Motion detected"

class Accelerometer(App):

    def build(self):

        grid = MyGrid()

        Window.bind(on_motion=grid.on_motion)

        return MyGrid()

if __name__ == "__main__":

    Accelerometer().run()

[Nick S]

Ooops. I returned the wrong thing from my build method, also the parameters in my on_motion method don't seem to work. I think this is better...

from kivy.app import App

from kivy.uix.gridlayout import GridLayout

from kivy.uix.label import Label

from kivy.core.window import Window

class MyGrid(GridLayout):

    def __init__(self, **kwargs):

        super(MyGrid, self).__init__(**kwargs)

        self.cols = 1

        self.size_hint = (0.6, 0.7)

        self.pos_hint = {"center_x":0.5, "center_y":0.5}

        #add widgets to window   

        self.greeting = Label(text="Ready...")

        self.add_widget(self.greeting)

    def on_motion(self, eType, me, x):

        self.greeting.text = "Motion detected"

class Accelerometer(App):

    def build(self):

        grid = MyGrid()

        Window.bind(on_motion=grid.on_motion)

        return grid

if __name__ == "__main__":

    Accelerometer().run()

The on_motion method actually runs now so I think I've implemented it more or less correctly. It only runs when I touch my phone screen though, not in response to movement. I think this means I should investigate plyer next. Still... any advice greatly appreciated.

[Elliot Garbus]

The GridLayout does not have an event on_motion.  I assume you want to to use the accelerometer on your phone. 

You will need to use plyer.  See: https://github.com/kivy/plyer

The docs: https://plyer.readthedocs.io/en/latest/#

Examples using the accelerometer:  https://github.com/kivy/plyer/tree/master/examples/accelerometer

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