Android 中RecyclerView多种item布局的写法（头布局+脚布局）

recyclerview多个item布局的写法（头布局+脚布局）

上图

github

下载源码

initial commit第一次提交的代码，为本文内容

以下的为主要代码，看注释即可，比较简单

mainactivity

含上拉加载更多

package com.anew.recyclerviewall;

import android.os.bundle;
import android.os.handler;
import android.support.v7.app.appcompatactivity;
import android.support.v7.widget.defaultitemanimator;
import android.support.v7.widget.divideritemdecoration;
import android.support.v7.widget.linearlayoutmanager;
import android.support.v7.widget.recyclerview;
import android.support.v7.widget.toolbar;
import android.util.log;
import java.util.arraylist;
import java.util.list;
public class mainactivity extends appcompatactivity {
  private recyclerview mrecyclerview;
  private list<string> mheadlist;
  private list<string> mbodylist;
  private list<string> mfootlist;
  private myadapter madapter;
  private linearlayoutmanager mlayoutmanager;
  handler mhandler = new handler();
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);
    setsupportactionbar(toolbar);
    mheadlist = new arraylist<>();
    for (int i = 0; i < 1; i++) {
      mheadlist.add("head" + i);
    }
    mbodylist = new arraylist<>();
    for (int i = 'a'; i < 'l'; i++) {
      mbodylist.add("" + (char) i);
    }
    mfootlist = new arraylist<>();
    for (int i = 0; i < 1; i++) {
      mfootlist.add("foot" + i);
    }
    mrecyclerview = (recyclerview) findviewbyid(r.id.rv);
//    使用默认的api绘制分割线
    mrecyclerview.additemdecoration
        (new divideritemdecoration(this, divideritemdecoration.horizontal));
//    设置增加删除item的动画效果
    mrecyclerview.setitemanimator(new defaultitemanimator());
//    瀑布流
//    mrecyclerview.setlayoutmanager(new staggeredgridlayoutmanager(4,staggeredgridlayoutmanager.vertical));
    mlayoutmanager = new linearlayoutmanager(this);
    mrecyclerview.setlayoutmanager(mlayoutmanager);
    madapter = new myadapter(this, mheadlist, mbodylist, mfootlist);
    mrecyclerview.setadapter(madapter);
    // 当目前的可见条目是所有数据的最后一个时，开始加载新的数据
    mrecyclerview.addonscrolllistener(new recyclerview.onscrolllistener() {
      @override
      public void onscrolled(recyclerview recyclerview, int dx, int dy) {
        super.onscrolled(recyclerview, dx, dy);
        int lastcompletelyvisibleitemposition = mlayoutmanager.findlastcompletelyvisibleitemposition();
        if (lastcompletelyvisibleitemposition + 1 == madapter.getitemcount()) {
          mhandler.postdelayed(new runnable() {
            @override
            public void run() {
              list<string> mmorelist = new arraylist<>();
              for (int i = 0; i < 3; i++) {
                mmorelist.add("more" + i);
              }
              mbodylist.addall(mmorelist);
              madapter.notifyiteminserted(madapter.getitemcount() - 2);
            }
          }, 1500);
          log.e("qqq", "到底了" + lastcompletelyvisibleitemposition);
        }
        int firstcompletelyvisibleitemposition = mlayoutmanager.findfirstcompletelyvisibleitemposition();
        if (firstcompletelyvisibleitemposition == 0&&dy<0) {
          log.e("eeeee", "开始刷新呀呀呀");
        }
      }
    });
  }
}

myadapter

对外部：头布局list、身体布局list、脚布局list，所有的list单独计数

内部：对position进行调整，这里需要耐心调整position

package com.anew.recyclerviewall;
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;
import android.widget.toast;
import java.util.list;
/**
 * created by a on 2017/1/7.
 */
public class myadapter extends recyclerview.adapter<recyclerview.viewholder> {
  private context context;
  private list<string> mheadlist;
  private list<string> mbodylist;
  private list<string> mfootlist;
  private static final int head_type = 1;
  private static final int body_type = 2;
  private static final int foot_type = 3;
  public myadapter(context context, list<string> headlist, list<string> bodylist, list<string> footlist) {
    this.context = context;
    this.mheadlist = headlist;
    this.mbodylist = bodylist;
    this.mfootlist = footlist;
  }
  //  ★ 1. 定义规则，什么情况，是哪一种viewtype
  @override
  public int getitemviewtype(int position) {
    int viewtype = -1;
    if (position < getheadcount()) {
      viewtype = head_type;
    } else if (position > getheadcount() + getbodycount() - 1) {
      //这里最后要减去1，慢慢地去数
      viewtype = foot_type;
    } else {
      viewtype = body_type;
    }
    return viewtype;
  }
  @override
  public recyclerview.viewholder oncreateviewholder(viewgroup parent, int viewtype) {
    layoutinflater inflater = layoutinflater.from(context);
    view view = null;
    //  ★ 2. 根据viewtype来确定加载那个布局，返回哪一个viewholder
    switch (viewtype) {
      case head_type:
        view = inflater.inflate(r.layout.item_head, parent, false);
        return new headholder(view);
      case body_type:
        view = inflater.inflate(r.layout.item_body, parent, false);
        return new bodyholder(view);
      case foot_type:
        view = inflater.inflate(r.layout.item_foot, parent, false);
        return new footholder(view);
    }
    return null;
  }
  @override
  public void onbindviewholder(final recyclerview.viewholder holder, final int position) {
// ★ 3. 根据holder是哪一个viewholder的实例，来确定操作哪一个布局的ui
    if (holder instanceof headholder) {
      headholder headholder = (headholder) holder;
      headholder.mtvhead.settext(mheadlist.get(position) + "");
      headholder.mtvhead.setonclicklistener(new view.onclicklistener() {
        @override
        public void onclick(view v) {
          adddata();
        }
      });
    }
    if (holder instanceof bodyholder) {
      final bodyholder bodyholder = (bodyholder) holder;
      bodyholder.mtvbody.settext(mbodylist.get(position - getheadcount()) + "");
      bodyholder.mtvbody.setonclicklistener(new view.onclicklistener() {
        @override
        public void onclick(view v) {
          removedata(bodyholder.getadapterposition());
        }
      });
    }
    if (holder instanceof footholder) {
      final footholder footholder = (footholder) holder;
      footholder.mtvfoot.settext(mfootlist.get(position - getheadcount() - getbodycount()) + "");
      footholder.mtvfoot.setonclicklistener(new view.onclicklistener() {
        @override
        public void onclick(view v) {
          toast.maketext(context, footholder.getadapterposition() + "",
              toast.length_short).show();
        }
      });
    }
  }
  @override
  public int getitemcount() {
    return getheadcount() + getbodycount() + getfootcount();
  }
  private int getfootcount() {
    return mfootlist.size();
  }
  private int getbodycount() {
    return mbodylist.size();
  }
  private int getheadcount() {
    return mheadlist.size();
  }
  public void adddata(int position) {
    mbodylist.add(position, "insert one");
//    ★★★★ 使用notifyiteminserted去更新数据，否则没有动画效果
    notifyiteminserted(position);
  }
  /**
   * 增加bodylist条目
   */
  public void adddata() {
    mbodylist.add("1");
    mbodylist.add("2");
    mbodylist.add("3");
//    ★★★★ 使用notifyiteminserted去更新数据，否则没有动画效果
    notifyitemrangeinserted(0, 3);
  }
  /**
   * 删除bodylist条目
   */
  public void removedata(int position) {
//    经测试疯狂点击删除条目，会产生负数，导致越界异常
    if (!(position - getheadcount() < 0)) {
//    ★★★★ 防止角标越界异常，要减去头布局数量，总之去数数吧
      mbodylist.remove(position - getheadcount());
      notifyitemremoved(position);
    }
  }
  /**
   * 头布局holder
   */
  static class headholder extends recyclerview.viewholder {
    private textview mtvhead;
    public headholder(view itemview) {
      super(itemview);
      mtvhead = (textview) itemview.findviewbyid(r.id.tv_head);
    }
  }
  /**
   * 身体布局holder
   */
  static class bodyholder extends recyclerview.viewholder {
    private textview mtvbody;
    public bodyholder(view itemview) {
      super(itemview);
      mtvbody = (textview) itemview.findviewbyid(r.id.tv_body);
    }
  }
  /**
   * 脚布局holder
   */
  static class footholder extends recyclerview.viewholder {
    private textview mtvfoot;
    public footholder(view itemview) {
      super(itemview);
      mtvfoot = (textview) itemview.findviewbyid(r.id.tv_foot);
    }
  }
}

item_body

item_head和item_foot类似就不粘贴了

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:id="@+id/ll"
       android:layout_width="match_parent"
       android:layout_height="40dp"
       android:layout_marginright="11px"
       android:layout_marginbottom="11px"
       android:background="@color/colorprimary"
       android:orientation="vertical">
  <textview
    android:id="@+id/tv_body"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:textsize="17sp"
    android:layout_gravity="center"
    android:text="hello world!"/>
</linearlayout>

以上所述是小编给大家介绍的android 中recyclerview多种item布局的写法（头布局+脚布局），希望对大家有所帮助