Android开发 - RecyclerView的使用

package com.haocent.Android.recyclerview.click;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.Toast;
import com.haocent.android.recyclerview.R;
import java.util.ArrayList;
import java.util.List;

public class RcvClickActivity extends AppCompatActivity implements RcvClickAdapter.OnItemClickListener {
    private static final String TAG = RcvClickActivity.class.getSimpleName();
    private List mList = new ArrayList();
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rcv_click_activity);
        initData();
        initView();
    }
    private void initData() {
        mList.add("亚特兰大老鹰");
        mList.add("夏洛特黄蜂");
        mList.add("迈阿密热火");
        mList.add("奥兰多魔术");
        mList.add("华盛顿奇才");
        mList.add("波士顿凯尔特人");
        mList.add("布鲁克林篮网");
        mList.add("纽约尼克斯");
        mList.add("费城76人");
        mList.add("多伦多猛龙");
        mList.add("芝加哥公牛");
        mList.add("克里夫兰骑士");
        mList.add("底特律活塞");
        mList.add("印第安纳步行者");
        mList.add("密尔沃基雄鹿");
        mList.add("达拉斯独行侠");
        mList.add("休斯顿火箭");
        mList.add("孟菲斯灰熊");
        mList.add("新奥尔良鹈鹕");
        mList.add("圣安东尼奥马刺");
        mList.add("丹佛掘金");
        mList.add("明尼苏达森林狼");
        mList.add("俄克拉荷马城雷霆");
        mList.add("波特兰开拓者");
        mList.add("犹他爵士");
        mList.add("金州勇士");
        mList.add("洛杉矶快船");
        mList.add("洛杉矶湖人");
        mList.add("菲尼克斯太阳");
        mList.add("萨克拉门托国王");
    }
    private void initView() {
        RcvClickAdapter adapter = new RcvClickAdapter(this, this);
        RecyclerView rcvClick = findViewById(R.id.rcv_click);
        rcvClick.setLayoutManager(new LinearLayoutManager(this));
        rcvClick.setHasFixedSize(true);
        rcvClick.setAdapter(adapter);
        adapter.setRcvClickDataList(mList);
    }
    @Override
    public void onItemClick(String content) {
        Toast.makeText(this, "你点击的是：" + content, Toast.LENGTH_SHORT).show();
    }
}

package com.haocent.android.recyclerview.click;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import com.haocent.android.recyclerview.R;
import java.util.ArrayList;
import java.util.List;

public class RcvClickAdapter extends RecyclerView.Adapter {
    private static final String TAG = RcvClickAdapter.class.getSimpleName();
    private Context mContext;
    private List mList = new ArrayList();
    private OnItemClickListener mListener;
    public RcvClickAdapter(Context context, OnItemClickListener listener) {
        mContext = context;
        mListener = listener;
    }
    public void setRcvClickDataList(List list) {
        Log.d(TAG, "setRcvClickDataList: " + list.size());
        mList = list;
        notifyDataSetChanged();
    }
    @NonNull
    @Override
    public RcvClickViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.rcv_click_recycle_item, parent, false);
        return new RcvClickViewHolder(view);
    }
    @Override
    public void onBindViewHolder(@NonNull RcvClickViewHolder holder, int position) {
        final String content = mList.get(position);
        holder.tvNum.setText(position + 1 + "");
        holder.tvContent.setText(content);
        // 第一种写法：直接在 Adapter 里写
//        holder.itemView.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View v) {
//                Toast.makeText(mContext, "你点击的是：" + content, Toast.LENGTH_SHORT).show();
//            }
//        });
        // 第二种写法：将点击事件传到 Activity 里去写
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mListener.onItemClick(content);
            }
        });
    }
    @Override
    public int getItemCount() {
        return mList == null ? 0 : mList.size();
    }
    public class RcvClickViewHolder extends RecyclerView.ViewHolder {
        TextView tvNum, tvContent;
        public RcvClickViewHolder(View itemView) {
            super(itemView);
            tvNum = itemView.findViewById(R.id.tv_num);
            tvContent = itemView.findViewById(R.id.tv_content);
        }
    }
    public interface OnItemClickListener {
        void onItemClick(String content);
    }
}

RecyclerView点击事件的两种写法：
①在Adapter里面直接对控件做点击事件

@Override
public void onBindViewHolder(@NonNull XxxViewHolder holder, int position) {
    holder.控件名.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO:
        }
    });
}

②写接口，在Activity或Fragment上实现接口中定义的方法

public interface OnItemClickListener {
    void onItemClick(参数类型 参数名 , ...);
}
private OnItemClickListener mListener;
public XxxAdapter(Context context, OnItemClickListener listener) {
    mContext = context;
    mListener = listener;
}
@Override
public void onBindViewHolder(@NonNull XxxViewHolder holder, int position) {
    holder.控件名.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mListener.onItemClick(content);
        }
    });
}
在 Activity 或 Fragment 上实现接口中定义的方法
public class XxxActivity extends AppCompatActivity implements XxxAdapter.OnItemClickListener
XxxAdapter adapter = new XxxAdapter(context, this);
@Override
public void onItemClick(String content) {
    // TODO:
}

① 在activity_main.xml内添加recyclerView，并将id设置为recyclerView
②新建rcv_click_recycle_item.xml文件，添加两个TextView组件，并将id分别设置为tv_num和tv_content

左侧列出了list中的数据，可上下滑动
右侧为点击效果，点击后有弹窗出现