How to Control Message Display at Startup in Your KivyMD Python App

Learn how to show or dismiss startup messages based on the starting screen in your `KivyMD` Python application. Follow this guide for a clear solution!
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to show or dismissed a message at startup when the start screen is changed in KivyMD Python?

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Control Message Display at Startup in Your KivyMD Python App

When developing applications with KivyMD, it's common to have different screens that your users navigate between. A typical requirement might be controlling the visibility of certain messages or pop-ups based on which screen is currently visible.

In this post, we will address a specific problem: how to dismiss a message if the starting screen is screen1, while ensuring that the message is displayed whenever any other screen is opened. By the end, you will have a clearer understanding of how to implement this functionality using KivyMD in Python.

Background

KivyMD (Kivy Material Design) is a library that allows developers to build user interfaces with Material Design principles in Kivy. Its popularity is rooted in its versatility and the variety of UI elements it offers.

Let's break down our solution into manageable steps below.

Problem Overview

You want to display a dialog message when your app starts, but only if the selected screen is not screen1. Fortunately, we can achieve this by using Kivy's screen management features and KivyMD's dialog boxes.

Your current implementation seems to always show the message upon app startup regardless of the current screen. Thus, we need to modify the behavior in our on_start method.

Solution Steps

Here’s a step-by-step outline for achieving this requirement:

Step 1: Define Your Screens

Start by defining the two screens (screen1 and screen2) in your Kivy layout. Each of these screens will have a button that allows switching between them.

Step 2: Create a Popup Class

We’ll create a custom popup class that will be responsible for displaying the message. This will ensure a cleaner and more organized way to manage our dialog.

Step 3: Control Popup Open/Close Logic

In your main app class (MyApp), modify the functions responsible for changing screens to include logic that determines when to show the popup.

Step 4: Bind Button Actions

Finally, bind the button actions to switch screens and trigger the popup based on the current screen.

Here's how the revised code may look:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

With the steps outlined above, you should now have a KivyMD application that only displays a message if the user is not on screen1 upon starting. This approach not only makes your application more user-friendly but also provides a polished experience.

Feel free to customize the message and styling of the popup to fit your app's theme. Happy coding with KivyMD!