RecyclerView点击事件监听

通过一个demo记录recyclerview的基础用法，包括设置item间距，adapter内监听点击和接口回调监听。
MyAdapter

package com.example.kw.recyclerviewtest;

import android.content.Context;
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.TextView;
import android.widget.Toast;

import java.util.List;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    private Context mContext;
    private List<String> mData;
    private OnItemClickListener mListener;

    public MyAdapter(Context context, List<String> data, OnItemClickListener listener){
        this.mContext = context;
        this.mData = data;
        this.mListener = listener;
    }

    @NonNull
    @Override
    public MyAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        MyViewHolder myViewHolder = new MyViewHolder(LayoutInflater.from(mContext).
                inflate(R.layout.my_item, viewGroup, false)); // 传入item布局
        return myViewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull MyAdapter.MyViewHolder viewHolder, final int i) {
        viewHolder.textView.setText(mData.get(i));
        viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Toast.makeText(mContext, "内部点击", Toast.LENGTH_SHORT).show();
                mListener.onClick(i);
            }
        });
    }

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

    class MyViewHolder extends RecyclerView.ViewHolder {
        private TextView textView;
        public MyViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.tv_item); // 通过布局找子控件,itemView是item布局，即my_item.xml的inflate
        }
    }

    // 外部接口回调监听
    public interface OnItemClickListener {
        void onClick(int pos);
    }
}

my_item.xml
这是单个item的布局，可以放置多个子控件，这里只放了一个TextView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#FFFFFF">

    <TextView
        android:id="@+id/tv_item"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:gravity="center"
        android:textColor="#000"
        android:textSize="20sp"/>

</LinearLayout>

activity_linear_recyclerViewActivity
这个是recyclerview的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FF353F47">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_main"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </android.support.v7.widget.RecyclerView>

</LinearLayout>

dimens.xml
间距插件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="dividerHeight">3dp</dimen>
</resources>

使用recyclerview的活动

package com.example.kw.recyclerviewtest;

import android.graphics.Rect;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class LinearRecyclerViewActivity extends AppCompatActivity {
    private RecyclerView mRvMain;
    private List<String > mData = new ArrayList<String>();

    private void initData() {
        mData.add("巴塞罗那");
        mData.add("皇家马德里");
        mData.add("尤文图斯");
        mData.add("拜仁慕尼黑");
        mData.add("曼城");
        mData.add("曼联");
        mData.add("多特蒙德");
        mData.add("利物浦");
        mData.add("巴黎圣日耳曼");
        mData.add("沙尔克04");
        mData.add("勒沃库森");
        mData.add("托特纳姆热刺");
        mData.add("那不勒斯");
        mData.add("国际米兰");
        mData.add("AC米兰");
        mData.add("马德里竞技");
        mData.add("切尔西");
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_linear_recycler_view);
        initData();
        mRvMain = findViewById(R.id.rv_main);
        mRvMain.setLayoutManager(new LinearLayoutManager(LinearRecyclerViewActivity.this));
        mRvMain.addItemDecoration(new MyDecoration());
        mRvMain.setAdapter(new MyAdapter(LinearRecyclerViewActivity.this, mData, new MyAdapter.OnItemClickListener() {
            @Override
            public void onClick(int pos) {
                Toast.makeText(LinearRecyclerViewActivity.this, "外部点击 " + pos, Toast.LENGTH_SHORT).show();
            }
        }));
    }

    class MyDecoration extends RecyclerView.ItemDecoration {
        @Override
        public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
            super.getItemOffsets(outRect, view, parent, state);
            outRect.set(0, 0, 0, getResources().getDimensionPixelOffset(R.dimen.dividerHeight)); // 1dp间隔下划线
        }
    }
}