Fixing Deprecated registerResGeneratingTask: How to Use registerGeneratedResFolders(FileCollection) for Seamless App Development

The registerResGeneratingTask method has been deprecated in recent Android Gradle Plugin (AGP) versions, causing some developers to encounter issues when building their projects. This guide will walk you through the process of updating your build scripts to use the new registerGeneratedResFolders(FileCollection) method, ensuring a seamless app development experience.

Table of Contents

  1. Understanding Deprecated registerResGeneratingTask
  2. Introducing registerGeneratedResFolders(FileCollection)
  3. Step-by-Step Guide on Updating Your Build Scripts
  4. FAQs
  5. Related Links

Understanding Deprecated registerResGeneratingTask

The registerResGeneratingTask method was used in earlier AGP versions to help generate resource files during the build process. However, this method has now been deprecated, and developers are encouraged to use the registerGeneratedResFolders(FileCollection) method instead.

Deprecated methods can lead to issues during the build process, and it's essential to update your build scripts to maintain compatibility with newer AGP versions.

Source: Android Developers: Migrate to Android Gradle plugin 4.1.0

Introducing registerGeneratedResFolders(FileCollection)

The new registerGeneratedResFolders(FileCollection) method is a more efficient and reliable way to register resource folders generated by your build scripts during the build process. This method allows you to specify a FileCollection object containing the locations of your generated resource folders.

Source: Google Developers: Variant API - registerGeneratedResFolders

Step-by-Step Guide on Updating Your Build Scripts

Follow these steps to update your build script and replace the deprecated registerResGeneratingTask with the registerGeneratedResFolders(FileCollection) method:

  1. Open your Android project in Android Studio.
  2. Locate your project's build.gradle file, usually found in the app module.
  3. Locate the registerResGeneratingTask method in your build script.
  4. Replace the registerResGeneratingTask method with the registerGeneratedResFolders(FileCollection) method, like this:
android {
    applicationVariants.all { variant ->
        def generatedResOutputDir = file("$buildDir/generated/res/your_custom_resources/${variant.dirName}")
  1. Replace your_custom_resources with the name of the folder where your generated resources are stored.
  2. Save the changes to your build.gradle file.
  3. Sync your project with the Gradle files by clicking the "Sync Now" button in the toolbar.
  4. Build your project to ensure that the changes have taken effect and that your project is now compatible with the new AGP version.


1. What does the "registerResGeneratingTask is deprecated" warning mean?

This warning indicates that the registerResGeneratingTask method you are using in your build script is now deprecated and may cause issues during the build process. It is recommended to update your build script to use the new registerGeneratedResFolders(FileCollection) method.

2. Why was registerResGeneratingTask deprecated?

The registerResGeneratingTask method was deprecated because it was less efficient and reliable compared to the new registerGeneratedResFolders(FileCollection) method. The new method offers a more effective way to register resource folders generated during the build process.

3. Can I still use registerResGeneratingTask in newer AGP versions?

While you may still be able to use the deprecated registerResGeneratingTask method in some cases, it is not recommended. Deprecated methods may cause build issues and may not be supported in future AGP versions. It's best to update your build script to use the new registerGeneratedResFolders(FileCollection) method.

4. How can I ensure my build scripts are always up to date?

To keep your build scripts up to date, make sure to follow the Android Developers Blog and the Android Studio Release Notes for the latest updates and best practices.

5. Can I use registerGeneratedResFolders(FileCollection) in older AGP versions?

The registerGeneratedResFolders(FileCollection) method may not be available in older AGP versions. If you need to use this method, it is recommended to update your project to a newer AGP version that supports it.

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