Why can't I open an application compiled into apk format when importing bluetooth?

Question

Python

Good day. The question is this: Why, when compiling the python code, I don’t see an application on android, but at the same time I found out that if I remove import bluetooth and all its components, it will work? There is one more question, what Do I need to make bluetooth work on android? Here is the code itself:

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.widget import Widget
from kivy.uix.button import Button
import bluetooth
class Widgets(Widget):
    def __init__(self):
        super(Widgets, self).__init__()
 
    def btn_clk1(self):
        a = self.lbl.text 
        client=bluetooth.BluetoothSocket( bluetooth.RFCOMM )
        ADDR = "00:68:58:00:6F:EA"
        client.connect((ADDR,1))
        client.send(a)
        client.close()
        
    def btn_clk2(self):
        server_sock=bluetooth.BluetoothSocket( bluetooth.RFCOMM )
 
        port = 1
        server_sock.bind(("",port))
        server_sock.listen(1)
 
        client_sock,address = server_sock.accept()
        print ("Accepted connection from ",address)
 
        data = client_sock.recv(1024)
        self.lbl.text = data
        client_sock.close()
        server_sock.close()
class SimpleKivy(App):
    def build(self):
        return Widgets()
SimpleKivy().run()

#File name: kivyn.py
#kivy 1.9.1
 
<Widgets>:
    lbl: my_label
    labe: my_labels
    Button:
        size: 100,75
        pos: 0,0
        text: "client"
        color: 0,1,0,1
        font_size: 40
        on_press: root.btn_clk1()
    Button:
        id: 1
        size: 170,75
        pos: 100,0
        text: "server"
        color: 1,0,0,1
        font_size: 40
        on_press: root.btn_clk2()
    TextInput:
        id: my_label
        size: 300,300
        pos: 300,0
        text: ""
        color: 1,0,0,1
        font_size: 40
    TextInput:
        id: my_labels
        size: 300,300
        pos: 300,300
        text: "adr"
        color: 1,0,0,1
        font_size: 40

Thanks in advance!