FirebaseRecyclerAdapter和Android上的多项目类型 [英] FirebaseRecyclerAdapter and multiply item types on android

问题描述

我想添加2种类型：

1. with image


2. li>
   

在我的 recyclerview 中。我知道我需要覆盖从 FirebaseRecyclerAdapter 的方法，但我不知道如何。
帮我请这个。

  @Override 
 public int getItemViewType（int position）{
 return mModelLayout; 
 
 
 
抽象保护无效populateViewHolder（VH viewHolder，T模型，int位置）; 
 
 
 
 
 $ b所以我想从T模型类型的项目通过int（1  - 与图像，2 - 无），根据这个信息更改mModelLayout。我可以添加if else语句吗？ 
解决方案
这个答案建立在hatboysam的答案上。我花了很长时间才弄清楚所有事情是如何组合在一起的，所以我想我会在这里详细描述解决方案： 
 
 
  mRecyclerViewAdapter = new FirebaseRecyclerAdapter< DataObjectModel，ViewHolder>（
 DataObjectModel.class，R.layout.defaultitem_layout，ViewHolder.class，mDatabaseRef）{
 $ b $ @Override 
 public void populateViewHolder（ViewHolder viewholder，final DataObjectModel dataobject，int position）{
 
 if（getItemViewType（position）== R.layout.my_image_item）{
 viewholder.setName（dataobject.getName（））; 
} 
 else if（getItemViewType（position）== R.layout.my_no_image_item {
 viewholder.setText（dataobject.getText（））; 
} 
 
 $ b $ @Override 
 public int getItemViewType（int position）{
 DataObjectModel dataobject = getItem（position）; 
 if（dataobject.getType（）！= null&& dataobject.getType（）。equals（image））{
 //带有图片的项目的布局
 return R.layout.my_image_item）; 
} else if（dataobject.getType（）！= null&& datobject.getType（）。equals（noimage））{
 //没有图片的项目布局
返回R.layout.my_no_image_item; 
} 
} 
}; 
  
 // getName（）和setText（）是您必须在public static class ChatHolder扩展了RecyclerView.ViewHolderclass 
 
 
 
 //这里是ViewHolder类的一个很好的测量方法
 
 pre $ code> public static class ViewHolder extends RecyclerView.ViewHolder {
 View mView; 
 
 public ViewHolder（View itemView）{
 super（itemView）; 
 mView = itemView; 
 
 
 public void setName（String name）{
 TextView field =（TextView）mView.findViewById（R.id.name_text）; 
 field.setText（name）; 
 
 $ b $ public void setText（String text）{
 TextView field =（TextView）mView.findViewById（R.id.message_text）; 
 field.setText（text）; 
} 
} 
  

I want to add 2 types:-

1. with image
2. without image

in my recyclerview. I know that I need to override method from FirebaseRecyclerAdapter but I don't know how. Help me please with this.

@Override
public int getItemViewType(int position) {
    return mModelLayout;
}


abstract protected void populateViewHolder(VH viewHolder, T model, int position);

So I want to get from T-model type of item via int (1 - with image, 2 - without) and change mModelLayout basing on this info. Can I just add if else statement there ?

解决方案

This answer builds on hatboysam's answer. It took me ages to figure out how everything fits together so I thought I'd describe the solution thoroughly here:

    mRecyclerViewAdapter = new FirebaseRecyclerAdapter<DataObjectModel, ViewHolder>(
            DataObjectModel.class, R.layout.defaultitem_layout, ViewHolder.class, mDatabaseRef) {

        @Override
        public void populateViewHolder(ViewHolder viewholder, final DataObjectModel dataobject, int position) {

            if (getItemViewType(position) == R.layout.my_image_item){
                viewholder.setName(dataobject.getName()); 
            }
            else if (getItemViewType(position) == R.layout.my_no_image_item{
                viewholder.setText(dataobject.getText());
        }


        @Override
        public int getItemViewType(int position) {
            DataObjectModel dataobject = getItem(position);
            if (dataobject.getType() != null && dataobject.getType().equals("image")) {
                // Layout for an item with an image
                return  R.layout.my_image_item);
            } else if (dataobject.getType() != null && dataobject.getType().equals("noimage")) {
                // Layout for an item without an image
                return  R.layout.my_no_image_item;
            }
        }
    };

//getName() and setText() are methods you have to write in the "public static class ChatHolder extends RecyclerView.ViewHolder" class

// Here's the ViewHolder Class for good measure

    public static class ViewHolder extends RecyclerView.ViewHolder {
        View mView;

        public ViewHolder (View itemView) {
            super(itemView);
            mView = itemView;
        }

        public void setName(String name) {
            TextView field = (TextView) mView.findViewById(R.id.name_text);
            field.setText(name);
        }

        public void setText(String text) {
            TextView field = (TextView) mView.findViewById(R.id.message_text);
            field.setText(text);
        }
}

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