Resolving the ModuleNotFoundError in KivyMD Apps on Android

Discover how to fix the KivyMD app crashing on Android with the `ModuleNotFoundError: No module named 'PIL'`. Learn the simple steps to add `pillow` to your buildozer requirements and get your app back up and running.
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This video is based on the question https://stackoverflow.com/q/66303837/ asked by the user 'Oleksandr K' ( https://stackoverflow.com/u/9952495/ ) and on the answer https://stackoverflow.com/a/66303927/ provided by the user 'Ankit Sangwan' ( https://stackoverflow.com/u/13936766/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the KivyMD App Crash on Android: A Step-by-step Guide

If you're a Kivy developer, you might have encountered a frustrating issue where your app crashes on an Android device, displaying the ominous message:

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

This problem can be particularly confusing, especially if your app runs smoothly on other platforms like macOS. Let's break down the cause of this error and the steps you can take to resolve it quickly.

Understanding the Problem

The error message indicates that your Android build of the KivyMD app cannot locate the Python Imaging Library (PIL). This library is essential for many functionalities in KivyMD, and without it, your app will fail to launch. Despite working previously, updates or changes to your app or libraries could have led to this new issue.

Why Does KivyMD Depend on PIL?

KivyMD is an open-source library that extends Kivy with Material Design components. It relies on PIL for handling image processing tasks, which means if PIL is missing from your project, KivyMD cannot function properly on Android devices.

How to Resolve the Issue: Step-by-Step Instructions

Step 1: Update Your buildozer.spec File

To fix the crash, you need to ensure that pillow, the modern version of PIL, is included in your project's requirements. Here's how to do it:

Open your buildozer.spec file in the root directory of your Kivy project.

Locate the requirements line, which typically looks something like this:

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

Add pillow to the list of requirements. Your updated line should look like this:

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

Step 2: Rebuild Your App

After modifying the buildozer.spec file, you'll need to rebuild your app to ensure that the changes take effect.

Run the following command to initiate the build process again:

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

Step 3: Test on Your Android Device

Once the build completes successfully, transfer the new APK to your Android device, install it, and launch the app. This time, you should find that the app starts without issues, indicating that the missing module error has been resolved.

Conclusion

Encountering a ModuleNotFoundError linked to PIL in your KivyMD app can be alarming, but with these straightforward steps, you can easily remedy the situation. Remember to include pillow in your buildozer.spec requirements, and your app should run smoothly again on your Android device.

Feel free to leave your thoughts or further questions in the comments below, and happy coding!

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