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    def button_save_down(self):
        documents_path = os.path.join(os.path.expanduser('~'), 'Documents')
        self.gps_save = str(documents_path)

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foldername='/storage/emulated/0/Documents'

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Permission denied: '/storage/emulated/0/Documents/Test.txt'

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        request_permissions([Permission.ACCESS_COARSE_LOCATION,
                             Permission.ACCESS_FINE_LOCATION,
                             Permission.WRITE_EXTERNAL_STORAGE,
                             Permission.READ_EXTERNAL_STORAGE
                             ], callback)

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        if platform == 'android':
            environment = autoclass('android.os.Environment')
            if environment.getExternalStorageState() == environment.MEDIA_MOUNTED:
                # root = environment.getExternalStorageDirectory().getAbsolutePath()
                root = environment.getExternalStoragePublicDirectory(environment.DIRECTORY_DOCUMENTS).getAbsolutePath()
            else:
                # root = context.getExternalFilesDir().getAbsolutePath()
                root = os.getcwd() + '/tmp/'
            # root += '/knapps_apps.reduce/'

            pather = os.path.join(root, "GPS-Daten.txt")
            if not os.path.isfile(pather):
                with open(pather, "w") as writer:
                    if self.gps_location is None:
                        writer.write("Hello World")
                    else:
                        writer.write(str(self.gps_location))
            else:
                try:
                    fob = open(pather, 'w')
                    fob.write(str(self.gps_location))
                    fob.close()
                except Exception as e:
                    self.gps_location = str(e)