android中RecyclerView控件实现点击事件

RecyclerView控件实现点击事件跟ListView控件不同，并没有提供类似setOnItemClickListener()这样的注册监听器方法，而是需要自己给子项具体的注册点击事件。

本文的例子是在上一篇文章的基础上修改的，上一篇文章：android中RecyclerView控件实现瀑布流布局

上一篇文章的代码，只需要修改NewsAdapter.java，注意红色部分内容是添加的内容：

package com.example.chenrui.app1;

import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.chenrui.common.News;

import java.util.List;
import java.util.Random;

public class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.ViewHolder> {

    private List<News> newsList;

    public NewsAdapter(List<News> newsList) {
        this.newsList = newsList;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.news_item1,viewGroup,false);
        final ViewHolder viewHolder = new ViewHolder(view);

        viewHolder.newsImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int position = viewHolder.getAdapterPosition();
                News news = newsList.get(position);
                Toast.makeText(v.getContext(), "新闻图片点击：你点击了新闻：" + news.getTitle(), Toast.LENGTH_SHORT).show();
            }
        });

        viewHolder.newsTitle.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int position = viewHolder.getAdapterPosition();
                News news = newsList.get(position);
                Toast.makeText(v.getContext(), "新闻标题点击：你点击了新闻：" + news.getTitle(), Toast.LENGTH_SHORT).show();
            }
        });

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
        News news = newsList.get(i);
        viewHolder.newsImage.setImageResource(news.getPic());

        ViewGroup.LayoutParams params = viewHolder.newsImage.getLayoutParams();
        params.height = params.height + new Random().nextInt(300);
        viewHolder.newsImage.setLayoutParams(params);

        viewHolder.newsTitle.setText(news.getTitle());
    }

    @Override
    public int getItemCount() {
        return newsList.size();
    }

    static class ViewHolder extends RecyclerView.ViewHolder {

        ImageView newsImage;
        TextView newsTitle;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);

            newsImage = itemView.findViewById(R.id.newsPic);
            newsTitle = itemView.findViewById(R.id.newsTitle);
        }
    }
}

通过这个例子，点击新闻图片和新闻标题都会弹出对应的提示信息。