三个不同设计的CardView只能用一个RecyclerView吗？

Question

我可以只创建一个 recycler_view.xml 来处理我的三组不同设计的 cardview.xml 吗？ 或者我需要创建单独的 recyclerView 我的每一个 cardViews。

例如，News, Activities and Groups 有不同的 CardView。

Answer 1

是的，你可以使用 getItemViewType()

根据视图类型为项目展开不同的布局

Example

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    class ViewHolder0 extends RecyclerView.ViewHolder {
        ...
    }

    class ViewHolder2 extends RecyclerView.ViewHolder {
        ...
    }

    @Override
    public int getItemViewType(int position) {

        return viewType;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         switch (viewType) {
             case 0: return new ViewHolder0(...);
             case 2: return new ViewHolder2(...);
             ...
         }
    }
}

Answer 2

是的，我们可以使用多个 cardView。参考见下文link Sample Adapter

这里我显示评论列表，当没有评论时我显示没有可用的评论。在这里，我正在创建 2 个 ViewHolders，一个用于我的评论项目，另一个用于没有评论可用的项目。

代码：

package com.subbu.moviemasti.adapter;

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.subbu.moviemasti.R;
import com.subbu.moviemasti.entities.Review;
import com.subbu.moviemasti.fragment.IReviewView;

import java.util.List;

import butterknife.Bind;
import butterknife.ButterKnife;

/**
 * Created by subrahmanyam on 24-12-2015.
 */
public class ReviewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private final List<Review> results;

    public ReviewAdapter(IReviewView reviewFragment, List<Review> results) {
        this.results = results;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = null;
        RecyclerView.ViewHolder viewHolder = null;
        switch (viewType) {
            case 0:
                view = View.inflate(parent.getContext(), R.layout.list_item_empty_view, null);
                viewHolder = new EmptyViewHolder(view);
                break;
            case 1:
                view = View.inflate(parent.getContext(), R.layout.review_list_item, null);
                viewHolder = new ViewHolder(view);
                break;
        }
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        int viewType = getItemViewType(position);
        switch (viewType) {
            case 0:
                EmptyViewHolder emptyViewHolder = (EmptyViewHolder) holder;
                emptyViewHolder.emptyView.setText(((EmptyViewHolder) holder).emptyView.getResources().getString(R.string.no_trailers));
                break;
            case 1:
                Review review = results.get(position);
                ViewHolder viewHolder = (ViewHolder) holder;
                viewHolder.userName.setText(review.getAuthor());
                viewHolder.review.setText(review.getContent());
                break;
        }
    }

    @Override
    public int getItemCount() {
        return results.size() > 0 ? results.size() : 1;
    }

    @Override
    public int getItemViewType(int position) {
        return results.size() == 0 ? 0 : 1;
    }

    class ViewHolder extends RecyclerView.ViewHolder {
        @Bind(R.id.review_user)
        TextView userName;
        @Bind(R.id.review_review)
        TextView review;

        public ViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }
}

三个不同设计的CardView只能用一个RecyclerView吗？

Can I Use Only One RecyclerView For The Three Different CardView With Different Design?

android

android-cardview

android-recyclerview