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#main.py

from kivy.lang import Builder

从 kivymd.app 导入 MDApp

类 MainApp（MDApp）：

def build(self):
    self.theme_cls.theme_style = 'Dark'
    self.theme_cls.primary_palette = 'BlueGray'
    return Builder.load_file('main.kv')

MainApp().run()

#main.kv

#: 导入地图视图 kivy.garden.mapview.MapView

MDBoxLayout：方向：'垂直'

MDBoxLayout:
    size_hint: (1, .1)
    Label:
        text: 'how to print the on_lat and on_lon on the label below (its now print on terminal)'
MDBoxLayout:
    size_hint: (1, .8)
    MapView:
        lat: 5.66774
        lon: 116.36641
        zoom: 12
        on_lat:
            print('lat', self.lat)
        on_lon:
            print('lon', self.lon)
MDBoxLayout:
    size_hint: (1, .1)
    Label:
        id: latlon
        text: 'print (on_lat) and (on_lon) here'
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