pydroid sample

import tkinter as tk
from jnius import autoclass

    # Access Android Toast class
Context = autoclass('android.content.Context')
Toast = autoclass('android.widget.Toast')
String=autoclass("java.lang.String")
Handler=autoclass("android.os.Handler")
Looper=autoclass("android.os.Looper")

main_handler=Handler(Looper.getMainLooper())

def exit_app():
    root.destroy()

def show_toast():
    # Get the text from the entry
    main_handler.post(toast_runnable)

def toast_runnable():
    # Get the Android application context
    app_context = autoclass('org.kivy.android.PythonActivity').mActivity
    j_msg=String(entry.get())
    # Show the toast with the message
    Toast.makeText(app_context, j_msg, Toast.LENGTH_SHORT).show()

# Create the main window
root = tk.Tk()
root.title("Tkinter with Toast")
root.geometry("300x200")  # Set the window size

# Add a label
label = tk.Label(root, text="Enter something:")
label.pack(pady=10)

# Add a text entry field
entry = tk.Entry(root, width=25)
entry.pack(pady=5)

# Add a button to close the app
exit_button = tk.Button(root, text="Return to Editor", command=exit_app)
exit_button.pack(pady=10)

# Add a button to show the toast
toast_button = tk.Button(root, text="Show Toast", command=show_toast)
toast_button.pack(pady=10)

# Run the Tkinter event loop
root.mainloop()