A FileHandleResolver implementation witch tests if requested file exists in a path starting with an additional folder. This can be useful when using android flavors.

DualFileHandleResolver.java

import com.badlogic.gdx.assets.loaders.FileHandleResolver;
import com.badlogic.gdx.files.FileHandle;

public class DualFileHandleResolver implements FileHandleResolver {

    private FileHandleResolver baseResolver;
    private String additionalAssetsPath;

    public DualFileHandleResolver(FileHandleResolver baseResolver, String additionalAssetsPath) {
        this.baseResolver = baseResolver;
        this.additionalAssetsPath = additionalAssetsPath;
    }

    @Override
    public FileHandle resolve(String fileName) {

        FileHandle handle = baseResolver.resolve(String.format("%s/%s", additionalAssetsPath, fileName));

        return handle.exists() ? handle : baseResolver.resolve(fileName);
    }
}