RecyclerView与ListView原理是类似的：都是仅仅维护少量的View并且可以展示大量的数据集。RecyclerView用以下两种方式简化了数据的展示和处理:

使用LayoutManager来确定每一个item的排列方式。

为增加和删除项目提供默认的动画效果。

RecyclerView虽然作为ListView的替代者有着较好的性能提升，但是ListView的一些常用功能却没有提供，比如我们平时会经常用到的addHeaderView，addFooterView，既然RecyclerView没有提供这个方法，我们应该如何为列表添加头部和底部呢？通过看ListView的源码可以知道ListView的添加Header和Footer是靠Adapter里面动态添加的，所以我们按照这个思路也给RecyclerView添加HeaderView和FooterView，先看一下效果

如果你还不了解RecyclerView如何使用，可以看一下前几篇博文

RecyclerView的使用之HelloWorld

RecyclerView的使用之多Item布局的加载

RecyclerView实现添加HeaderView和FooterView的核心就是在Adapter里面的onCreateViewHolder根据viewType来判断是列表项还是HeaderView来分别加载不同的布局文件，当然viewType的判断规则也是由我们定义的，废话不多说，看一下具体的实现效果。

1：Gradle配置 build.gradle

compile 'com.android.support:recyclerview-v7:23.1.1'compile 'com.android.support:cardview-v7:23.1.1'

2：主布局文件 activity_main.xml 很简单里面一个RecyclerView

<?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.support.v7.widget.RecyclerViewxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:id="@+id/rv_list"/></LinearLayout>

3：列表项布局 rv_item.xml 外面一个CardView的卡片式容器里面一个TextView

<?xml version="1.0" encoding="utf-8"?><android.support.v7.widget.CardViewxmlns:card_view="http://schemas.android.com/apk/res-auto"xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="8dp"android:id="@+id/cv_item"android:foreground="?android:attr/selectableItemBackground"card_view:cardCornerRadius="4dp"card_view:cardElevation="4dp"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/tv_item_text"android:text="test"android:layout_margin="8dp"/></LinearLayout></android.support.v7.widget.CardView>

4：列表头部布局 rv_header.xml

<?xml version="1.0" encoding="utf-8"?><android.support.v7.widget.CardViewxmlns:card_view="http://schemas.android.com/apk/res-auto"xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="8dp"android:id="@+id/cv_item"android:foreground="?android:attr/selectableItemBackground"card_view:cardCornerRadius="4dp"card_view:cardElevation="4dp"card_view:cardBackgroundColor="#4CAF50"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="150dp"><TextViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:text="Header"android:textSize="30sp"android:textColor="#ffffff"android:gravity="center"/></LinearLayout></android.support.v7.widget.CardView>

5：列表底部布局 rv_footer.xml

<?xml version="1.0" encoding="utf-8"?><android.support.v7.widget.CardViewxmlns:card_view="http://schemas.android.com/apk/res-auto"xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="8dp"android:id="@+id/cv_item"android:foreground="?android:attr/selectableItemBackground"card_view:cardCornerRadius="4dp"card_view:cardElevation="4dp"card_view:cardBackgroundColor="#E91E63"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="150dp"><TextViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:text="Footer"android:textSize="30sp"android:textColor="#ffffff"android:gravity="center"/></LinearLayout></android.support.v7.widget.CardView>

6：*HeaderBottomAdapter.java，RecyclerView的Adapter，在getItemViewType方法里面判断了当前Item的类型，然后在onCreateViewHolder跟据item的类型分别加载不同的布局以实现HeaderView和FooterView，其他方法的含义可以参考注释

import android.content.Context;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;/*** Created by Lijizhou on 2016/2/24.* Blog:http://blog.csdn.net/leejizhou* QQ:3107777777*/public class HeaderBottomAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {//item类型public static final int ITEM_TYPE_HEADER = 0;public static final int ITEM_TYPE_CONTENT = 1;public static final int ITEM_TYPE_BOTTOM = 2;//模拟数据public String [] texts={"java","python","C++","Php",".NET","js","Ruby","Swift","OC"};private LayoutInflater mLayoutInflater;private Context mContext;private int mHeaderCount=1;//头部View个数private int mBottomCount=1;//底部View个数public HeaderBottomAdapter(Context context) {mContext = context;mLayoutInflater = LayoutInflater.from(context);}//内容长度public int getContentItemCount(){return texts.length;}//判断当前item是否是HeadViewpublic boolean isHeaderView(int position) {return mHeaderCount != 0 && position < mHeaderCount;}//判断当前item是否是FooterViewpublic boolean isBottomView(int position) {return mBottomCount != 0 && position >= (mHeaderCount + getContentItemCount());}//判断当前item类型@Overridepublic int getItemViewType(int position) {int dataItemCount = getContentItemCount();if (mHeaderCount != 0 && position < mHeaderCount) {//头部Viewreturn ITEM_TYPE_HEADER;} else if (mBottomCount != 0 && position >= (mHeaderCount + dataItemCount)) {//底部Viewreturn ITEM_TYPE_BOTTOM;} else {//内容Viewreturn ITEM_TYPE_CONTENT;}}//内容 ViewHolderpublic static class ContentViewHolder extends RecyclerView.ViewHolder {private TextView textView;public ContentViewHolder(View itemView) {super(itemView);textView=(TextView)itemView.findViewById(R.id.tv_item_text);}}//头部 ViewHolderpublic static class HeaderViewHolder extends RecyclerView.ViewHolder {public HeaderViewHolder(View itemView) {super(itemView);}}//底部 ViewHolderpublic static class BottomViewHolder extends RecyclerView.ViewHolder {public BottomViewHolder(View itemView) {super(itemView);}}@Overridepublic RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {if (viewType ==ITEM_TYPE_HEADER) {return new HeaderViewHolder(mLayoutInflater.inflate(R.layout.rv_header, parent, false));} else if (viewType == mHeaderCount) {return new ContentViewHolder(mLayoutInflater.inflate(R.layout.rv_item, parent, false));} else if (viewType == ITEM_TYPE_BOTTOM) {return new BottomViewHolder(mLayoutInflater.inflate(R.layout.rv_footer, parent, false));}return null;}@Overridepublic void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {if (holder instanceof HeaderViewHolder) {} else if (holder instanceof ContentViewHolder) {((ContentViewHolder) holder).textView.setText(texts[position - mHeaderCount]);} else if (holder instanceof BottomViewHolder) {}}@Overridepublic int getItemCount() {return mHeaderCount + getContentItemCount() + mBottomCount;}}

7：最后一步，MainActivity.java

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;public class MainActivity extends AppCompatActivity {private RecyclerView mRecyclerView;private HeaderBottomAdapter adapter;GridLayoutManager gridLayoutManager;LinearLayoutManager layoutManager;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mRecyclerView=(RecyclerView)findViewById(R.id.rv_list);//List布局layoutManager=new LinearLayoutManager(this);layoutManager.setOrientation(LinearLayoutManager.VERTICAL);mRecyclerView.setLayoutManager(layoutManager);mRecyclerView.setAdapter(adapter=new HeaderBottomAdapter(this));//Grid布局 // gridLayoutManager=new GridLayoutManager(MainActivity.this, 2);// mRecyclerView.setLayoutManager(gridLayoutManager);//这里用线性宫格显示 类似于grid view// mRecyclerView.setAdapter(adapter=new HeaderBottomAdapter(this));////// gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {// @Override// public int getSpanSize(int position) {// return (adapter.isHeaderView(position) || adapter.isBottomView(position)) ? gridLayoutManager.getSpanCount() : 1;// }// });}}

这里注意一点，如果你的RecyclerView使用Grid类型列表在设置Adapter后需要调用这个方法，根据当前Item类型来判断占据的横向格数，这也是Adapter里面实现isHeaderView和isBottomView的缘故

gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {@Overridepublic int getSpanSize(int position) {return (adapter.isHeaderView(position) || adapter.isBottomView(position)) ? gridLayoutManager.getSpanCount() : 1;}});

Ok，RecyclerView添加Header和Footer就这样轻松实现了，你也可以把Adapter再次封装更有利于日常的开发。

关于使用RecyclerView添加Header和Footer的方法就给大家介绍到这里，希望对大家有所帮助！