AlertDialog不显示文件列表

File folder = new File("/path/to/folder");
File[] files = folder.listFiles();

LayoutInflater inflater = getLayoutInflater();
View dialogView = inflater.inflate(R.layout.dialog_file_list, null);
RecyclerView recyclerView = dialogView.findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(new FileListAdapter(files));

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("选择文件");
builder.setView(dialogView);
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        // 处理用户点击确定按钮的事件
    }
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        // 处理用户点击取消按钮的事件
    }
});
builder.show();