对于RecyclerView的使用越来越多。
首先来看效果图

recyclerView.gif

我们来进行代码的编写 ，recyclerView 添加了一个头部，底部。
首先来讲它们对应的布局创建一下。
layout_header.xml

<?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="wrap_content">
    <TextView
        android:id="@+id/tv_header"
        android:text="Header"
        android:textSize="30sp"
        android:gravity="center_horizontal|center_vertical"
        android:background="@color/colorAccent"
        android:layout_width="match_parent"
        android:layout_height="200dp" />

</LinearLayout>

layout_footer:

<?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="wrap_content">
    <TextView
        android:id="@+id/tv_loading"
        android:gravity="center"
        android:text="footer"
        android:layout_width="match_parent"
        android:layout_height="30dp" />

</LinearLayout>

中间的item布局：
layout_item:

<?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="wrap_content">
    <TextView
        android:background="@color/colorPrimary"
        android:id="@+id/tv_test"
        android:textSize="20sp"
        android:text="123"
        android:gravity="center"
        android:textColor="#000"
        android:layout_width="match_parent"
        android:layout_height="100dp" />

</LinearLayout>

再看activity的xml，很简单就是一个RecyclerView,做之前要依赖一下recyclerview的控件

<?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:orientation="vertical"
    >
    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_second"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </android.support.v7.widget.RecyclerView>

</LinearLayout>

现在我们首先来编写RecyclerView 的适配器：

package com.example.chen.loadingtest;

import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

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

/**
 * author : chen
 * date   : 2018/8/22  10:16
 * desc   :
 */
public class SecondActivity extends AppCompatActivity {

    private RecyclerView rv_second;
    private List<String> data = new ArrayList<>();
    private SecAdapter adapter;
    private GridLayoutManager manager;
    private int lastVisibleItem = 0;
    private final int PAGE_COUNT = 10;   //模拟分页10个数据为一页

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        initView();
        initData();
        initRecy();

    }



    private void initRecy() {
        adapter = new SecAdapter(getDatas(0,PAGE_COUNT),this,getDatas(0,PAGE_COUNT).size()>0?true:false);
        //添加头部和底部
        adapter.setmHeadView(LayoutInflater.from(this).inflate(R.layout.layout_header,null));
        adapter.setmFooterView(LayoutInflater.from(this).inflate(R.layout.layout_footer,null));

        manager = new GridLayoutManager(this,1);
        rv_second.setLayoutManager(manager);
        //添加下划线
        rv_second.addItemDecoration(new DividerItemDecoration(this,MyDecoration.VERTICAL_LIST));
        rv_second.setAdapter(adapter);
        //item的监听事件
        adapter.setOnItemListener(new SecAdapter.OnItemListener() {
            @Override
            public void OnItemClick(View view) {
                int position = rv_second.getChildAdapterPosition(view);
                Toast.makeText(SecondActivity.this,data.get(position-1),Toast.LENGTH_SHORT).show();
            }
        });
        rv_second.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                //对于滑动的事件操作
                if(newState==RecyclerView.SCROLL_STATE_IDLE){
                    Log.e("tag","多少个:"+adapter.getItemCount());
                    Log.e("tag","现在个:"+lastVisibleItem);
                    Log.e("tag","fadeTip:"+adapter.isfadeTip());
                    //lastVisibleItem最后可看见的item
                    if(adapter.isfadeTip()==false&&lastVisibleItem+1==adapter.getItemCount()){
                        new Handler().postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                //减去2是因为头部和底部是增加出来的View
                                updateData(adapter.getItemCount()-2,adapter.getItemCount()+PAGE_COUNT-2);
                            }
                        },1000);

                    }else if(adapter.isfadeTip()==true){
                        new Handler().postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                updateData(adapter.getItemCount()-2,adapter.getItemCount()+PAGE_COUNT-2);
                            }
                        },1000);

                    }

                }
            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                //找到对吼一个可见的item
                lastVisibleItem = manager.findLastVisibleItemPosition();

            }
        });
    }

    private void updateData(int fromIndex, int toIndex) {
        List<String> newDatas = getDatas(fromIndex, toIndex);
        Log.e("tag","数量:"+newDatas.size());
        if (newDatas.size() > 0) {
            adapter.updateList(newDatas, true);
        } else {
            adapter.updateList(null, false);
        }

    }

    private List<String> getDatas(final int firstIndex, final int lastIndex) {
        List<String> resList = new ArrayList<>();
        for (int i = firstIndex; i < lastIndex; i++) {
            if (i < data.size()) {
                resList.add(data.get(i));
            }
        }
        return resList;
    }

    private void initData() {
        for(int i=1;i<=41;i++){
            data.add("序号"+i);
        }
    }

    private void initView() {
        rv_second = (RecyclerView) findViewById(R.id.rv_second);
    }
}

下划线：

package com.example.chen.loadingtest;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

/**
 * author : chen
 * date   : 2018/8/22  11:03
 * desc   :
 */
public class MyDecoration extends RecyclerView.ItemDecoration{

    private Context mContext;
    private Drawable mDivider;
    private int mOrientation;
    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    //我们通过获取系统属性中的listDivider来添加，在系统中的AppTheme中设置
    public static final int[] ATRRS  = new int[]{
            android.R.attr.listDivider
    };

    public MyDecoration(Context context, int orientation) {
        this.mContext = context;
        final TypedArray ta = context.obtainStyledAttributes(ATRRS);
        this.mDivider = ta.getDrawable(0);
        ta.recycle();
        setOrientation(orientation);
    }

    //设置屏幕的方向
    public void setOrientation(int orientation){
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST){
            throw new IllegalArgumentException("invalid orientation");        }        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        if (mOrientation == HORIZONTAL_LIST){
            drawVerticalLine(c, parent, state);
        }else {
            drawHorizontalLine(c, parent, state);
        }
    }

    //画横线, 这里的parent其实是显示在屏幕显示的这部分
    public void drawHorizontalLine(Canvas c, RecyclerView parent, RecyclerView.State state){
        int left = parent.getPaddingLeft();
        int right = parent.getWidth() - parent.getPaddingRight();
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++){
            final View child = parent.getChildAt(i);

            //获得child的布局信息
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams)child.getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
            //Log.d("wnw", left + " " + top + " "+right+"   "+bottom+" "+i);
        }
    }

    //画竖线
    public void drawVerticalLine(Canvas c, RecyclerView parent, RecyclerView.State state){
        int top = parent.getPaddingTop();
        int bottom = parent.getHeight() - parent.getPaddingBottom();
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++){
            final View child = parent.getChildAt(i);

            //获得child的布局信息
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams)child.getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDivider.getIntrinsicWidth();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    //由于Divider也有长宽高，每一个Item需要向下或者向右偏移
    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        if(mOrientation == HORIZONTAL_LIST){
            //画横线，就是往下偏移一个分割线的高度
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        }else {
            //画竖线，就是往右偏移一个分割线的宽度
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }
}

也是可以结合android.support.v4.widget.SwipeRefreshLayout控件来进行使用的：