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Android IDE Support

This page outlines the current IDE support for Android projects built with Mill. Mill integrates with IntelliJ IDEA and Android Studio through the BSP (Build Server Protocol) plugin.

Static Import Features and R Class Support

Mill provides syntax highlighting and code completion for Android-specific classes such as R in supported IDEs. This enables a smooth editing experience similar to standard Android development.

R Class Support

To ensure correct resolution of generated paths and resources, you must run a compilation from the command line after making changes to resource files or build.mill definitions. This ensures the BSP server updates the IDE with the latest sources and class files.

File Type Associations and Project Layout

The IDE properly recognizes file types and project layout when imported through BSP.

Importing via BSP

  • Source files, resource folders, and generated outputs are color-coded as expected.

  • Test directories are identified and appear in green.

  • Output folders (e.g., out/) and build targets appear in orange, indicating generated content.

Ensure mill --bsp-install has been run before importing the project via BSP.

Logcat Integration

While Logcat is primarily an Android Studio feature, it can be accessed in IntelliJ IDEA with the Android plugins installed.

Logcat Integration

Troubleshooting

If IDE features seem incomplete or broken:

  • Run mill __.compile to regenerate class files and trigger updates.

  • Resync the BSP project in your IDE.

  • Delete the out directory in case of persistent issues, then recompile the project.