[Python] Getting [Errno 1] Operation is not permitted error when trying to write to...

I have been around the mulberry bush for a few weeks now trying to implement the writing of a file on an android phone. My development setup is on a Windows PC with Anaconda and Pycharm. I am using kivy and buildozer to create the android app. My test app is simply trying to write a file (test.txt) to the root directory of the SD card on the phone.

The directory is: /storage/emulated/0

The error I am getting is: [Errno 1] Operation is not permitted: '/storage/emulated/0/test.txt'

I ask for permissions in the code, but the permissions are not prompted at application startup or installation.

Here is the code;

import kivy
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.utils import platform
import os

class MyGridLayout(GridLayout):
def __init__(self, **kwargs):
super(MyGridLayout, self).__init__(**kwargs)

self.cols = 1

self.dir_button = Button(text="Show Directory")
self.dir_button.bind(on_press=self.press_dir)
self.add_widget(self.dir_button)

self.write_button = Button(text="Write File")
self.write_button.bind(on_press=self.press_write)
self.add_widget(self.write_button)

self.text_field = TextInput(multiline=True)
self.add_widget(self.text_field)

def press_dir(self, instance):
if platform == 'android':
from android.storage import primary_external_storage_path
self.file_dir = primary_external_storage_path()
else:
self.file_dir = App.get_running_app().user_data_dir

if not os.path.exists(self.file_dir):
os.mkdir(self.file_dir)

self.text_field.text = self.file_dir

def press_write(self, instance):
self.file_name = "test.txt"
self.full_name = os.path.join(self.file_dir, self.file_name)
try:
with open(self.full_name, "w") as outfile:
outfile.write("Hello World")
except Exception as e:
self.text_field.text = str(e)

class TestWriteApp(App):
def build(self):
return MyGridLayout()

if platform == 'android':
from android.permissions import request_permissions, Permission
request_permissions([Permission.WRITE_EXTERNAL_STORAGE,
Permission.READ_EXTERNAL_STORAGE])

testwriteapp = TestWriteApp()
testwriteapp.run()


Here are the screenshots during testing; Show Directory button enter image description here

Write File button enter image description here

Thanks for your help.

I tried a number of things...adding permissions in the buildozer.spec file, changing the output location to the internal user_data_dir (which worked, I think, but I need the user to be able to use the Files app to get the generated file)

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