在Android Studio中，布局文件默认是按照文件名的字母顺序进行排序的，而不是按照文件所在的子文件夹排序。如果希望按照子文件夹排序布局文件，可以通过自定义布局文件排序规则来实现。

1. 创建自定义的文件排序规则类，例如CustomLayoutSorter：

import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiDirectory;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiManager;
import com.intellij.psi.impl.file.PsiDirectoryImpl;
import com.intellij.psi.impl.file.PsiDirectoryImplUtil;
import com.intellij.psi.impl.file.PsiDirectoryWrapper;
import com.intellij.psi.impl.file.PsiFileSystemItemImpl;
import com.intellij.psi.impl.file.impl.FileManagerImpl;
import com.intellij.psi.impl.file.impl.FileManagerImplUtil;
import com.intellij.psi.impl.file.impl.FileManagerImplUtil.DirectoryMergeRequest;
import com.intellij.psi.impl.file.impl.FileManagerImplUtil.PsiDirectoryRequest;
import com.intellij.psi.impl.file.impl.FileManagerImplUtil.SortablePsiDirectory;
import com.intellij.psi.impl.file.impl.FileManagerImplUtil.SortingData;
import com.intellij.psi.impl.file.impl.PsiDirectoryImplUtil;
import com.intellij.psi.impl.file.impl.PsiDirectoryImplUtil.PsiDirectoryComparator;
import com.intellij.psi.impl.file.impl.PsiDirectoryImplUtil.PsiDirectoryComparatorUtil;
import com.intellij.psi.impl.file.impl.PsiDirectoryImplUtil.PsiDirectoryWrapperWithViewProviderComparator;
import com.intellij.psi.impl.file.impl.PsiDirectoryImplUtil.PsiDirectoryWrapperWithVirtualFileComparator;
import com.intellij.psi.impl.file.impl.PsiDirectoryImplUtil.SubdirectoriesComparator;
import com.intellij.psi.util.PsiUtilCore;
import org.jetbrains.android.facet.AndroidFacet;

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

public class CustomLayoutSorter {

    public static void sortLayoutFiles(Project project, VirtualFile[] files) {
        FileManagerImpl fileManager = (FileManagerImpl) PsiManager.getInstance(project).getFileManager();
        PsiDirectory[] directories = Arrays.stream(files)
                .map(file -> fileManager.findDirectory(file))
                .toArray(PsiDirectory[]::new);
        Arrays.sort(directories, new CustomComparator(project));
        for (int i = 0; i < directories.length; i++) {
            files[i] = directories[i].getVirtualFile();
        }
    }

    private static class CustomComparator implements Comparator {
        private final Project project;
        private final PsiDirectoryComparator psiDirectoryComparator;

        public CustomComparator(Project project) {
            this.project = project;
            psiDirectoryComparator = PsiDirectoryImplUtil.getComparator(project);
        }

        @Override
        public int compare(PsiDirectory o1, PsiDirectory o2) {
            if (o1 instanceof PsiDirectoryImpl && o2 instanceof PsiDirectoryImpl) {
                return comparePsiDirectoryImpl((PsiDirectoryImpl) o1, (PsiDirectoryImpl) o2);
            }
            return psiDirectoryComparator.compare(o1, o2);
        }

        private int comparePsiDirectoryImpl(PsiDirectoryImpl dir1, PsiDirectoryImpl dir2) {
            AndroidFacet facet1 = AndroidFacet.getInstance(dir1);
            AndroidFacet facet2 = AndroidFacet.getInstance(dir2);
            if (facet1 != null && facet2 != null && facet1.equals(facet2)) {
                if (facet1.isManifestFile(dir1.getVirtualFile())) {
                    return -1;
                }
                if (facet2.isManifestFile(dir2.getVirtualFile())) {
                    return 1;
                }
            }
            return psiDirectoryComparator.compare(dir1, dir2);
        }
    }
}

2. 在com.intellij.openapi.project.ex.ProjectManagerListener的实现类中添加排序逻辑。例如，在com.intellij.openapi.components.impl.stores.BatchUpdateListener中添加以下代码：

import com.intellij.openapi.project.Project;
import com.intellij.openapi.project.ex.ProjectManagerListener;
import com.intellij.openapi.vfs.VirtualFile;
import org.jetbrains.annotations.NotNull;

public class CustomLayoutSorterListener implements ProjectManagerListener {

    @Override
    public void projectOpened(@NotNull Project project) {
        project.getMessageBus().connect().subscribe(VirtualFileManager.VFS_CHANGES, new VirtualFileAdapter() {
            @Override
            public void contentsChanged(@NotNull VirtualFileEvent event) {
                VirtualFile file = event.getFile();
                if (file != null && file.getParent() != null && file.getParent().isDirectory()) {
                    VirtualFile[] children = file.getParent().getChildren();
                    if (children != null && children.length > 0 && children[0].isDirectory()) {