不生成绑定文件

Question

Android Studio 3.1。

应用程序/的build.gradle：

android {
    dataBinding {
        enabled = true
}

xml文件的名称： preview_brand_item.xml

在我的适配器中：

import com.myproject.android.customer.databinding.PreviewBrandItemBinding;

public class PreviewBrandSortAdapter extends PreviewBaseSortAdapter {

@Override
    protected int getLayoutIdForPosition(int position) {
        return R.layout.preview_brand_item;
    }

    @Override
    protected void setClickHandler(ViewDataBinding binding) {
        PreviewBrandItemBinding previewBrandItemBinding = (PreviewBrandItemBinding) binding;
        previewBrandItemBinding.setClickHandler(this);
}
}

这里是父适配器：

public abstract class PreviewBaseSortAdapter extends RealmRecyclerViewAdapter {

@Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
        ViewDataBinding binding = DataBindingUtil.inflate(layoutInflater, viewType, parent, false);
        setClickHandler(binding);
        return new PreviewBaseViewHolder(binding);
}

}

但 PreviewBrandItemBinding 未生成，因此我收到错误：

myproject\app\src\main\java\com\myproject\android\customer\ui\adapter\PreviewBrandSortAdapter.java:17: error: package com.myproject.android.customer.databinding does not exist
import com.myproject.android.customer.databinding.PreviewBrandItemBinding;