AAPT: error: resource android:attr/android:progressBarStyleSmall not found

By jacksparrow September 27, 2024

This error usually occurs when building an Android project, indicating that the resource android:attr/android:progressBarStyleSmall is missing or not being correctly referenced.

Understanding the Error

The error message itself indicates that the Android Asset Packaging Tool (AAPT) cannot locate the resource android:attr/android:progressBarStyleSmall, which defines the style for a small progress bar. This resource is typically used within a ProgressBar element in your XML layouts.

Causes of the Error

Incorrect Resource Declaration: You might be using the resource incorrectly, potentially referencing a non-existent resource or making a typographical error in the resource name.
Missing or Corrupted Support Library: The necessary Android support library, containing the progressBarStyleSmall attribute, might be missing or corrupted in your project.
Conflicting Dependencies: Incompatible library versions or conflicting dependencies might be causing the issue.

Troubleshooting Steps

1. Verify Resource Declaration

Ensure that you are correctly referencing the progressBarStyleSmall resource in your XML layouts:

<ProgressBar
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    style="?android:attr/progressBarStyleSmall" />

2. Update Support Library

Make sure your project is using the latest compatible version of the Android support library:

Open your project’s build.gradle (Module: app) file.
Check the dependencies section.
Ensure that the support library is included with the latest version:

implementation "androidx.appcompat:appcompat:1.5.1" // Example: Latest version

Sync your project after making the changes to ensure the updated dependencies are downloaded and applied.

3. Clean and Rebuild Project

Cleaning and rebuilding the project can sometimes resolve dependency issues or resolve any potential errors in your project’s configuration.

In Android Studio, go to **Build** > **Clean Project**.
After the cleaning process, go to **Build** > **Rebuild Project**.

4. Invalidate Caches and Restart

Sometimes, issues might arise due to outdated or corrupted cached files. Invalidating caches and restarting Android Studio can often resolve such problems:

In Android Studio, go to **File** > **Invalidate Caches / Restart…**
Select **Invalidate and Restart**.

5. Check Dependencies

Examine your project’s dependencies carefully, particularly those related to the Android support library or any custom libraries you’re using. Look for any conflicting versions or dependencies that might cause issues with resource availability.

dependencies {
    // ... other dependencies
    implementation 'com.example:mylibrary:1.0.0' // Example: Conflicting dependency
}

If you identify any conflicts, adjust the dependencies to resolve them or consider upgrading to compatible versions.

6. Reinstall Support Library

In rare cases, the support library might be corrupted or installed incorrectly. You can try reinstalling it:

Remove the existing support library dependency from your build.gradle file.
Sync your project to apply the changes.
Re-add the dependency using the latest version.
Sync your project again.

Preventing the Error

Use Appropriate Resources: Ensure you are referencing the correct resource names and paths within your project.
Keep Dependencies Updated: Regularly update your project’s dependencies to benefit from bug fixes, improvements, and compatibility updates.
Manage Dependencies Carefully: Be mindful of dependency conflicts and strive to use compatible versions of libraries.

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AAPT: error: resource android:attr/android:progressBarStyleSmall not found