Android RecyclerView自定义上拉和下拉刷新效果

使用recyclerview越来越多了，基本可以不用listview了，但是这个新的控件谷歌官方似乎设计的没有想listview那样方便快捷，listview自带有headview和 footerview所有我们很方便的可以实现上拉，下拉刷新，但是我们使用recyclerview就没有那样的舒服了，需要自己动手来实现这两个模块了。

本人参考了其他几篇博客使用了下感觉都有bug存在，于是自己改进了下，基本实现了功能，由于时间原因代码封装的还不彻底，仅供参考。

首页布局：activity_notice

 <?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.coordinatorlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="@android:color/white"
  android:orientation="vertical"
  >

  <include layout="@layout/toolbar" />

  <android.support.v4.widget.swiperefreshlayout
    android:id="@+id/swiperefreshlayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <android.support.v7.widget.recyclerview
      android:id="@+id/recyclerview"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:scrollbars="vertical"></android.support.v7.widget.recyclerview>
  </android.support.v4.widget.swiperefreshlayout>
</android.support.design.widget.coordinatorlayout>  

子item布局：item_base

<?xml version="1.0" encoding="utf-8"?>

<android.support.v7.widget.cardview xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginleft="@dimen/margin_10"
  android:layout_marginright="@dimen/margin_10"
  android:layout_margintop="6dp"
  android:orientation="vertical"
  app:cardbackgroundcolor="@color/line"
  app:cardpreventcorneroverlap="true"
  app:cardusecompatpadding="true"
  app:contentpadding="6dp">

  <linearlayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <textview
      android:id="@+id/tv_date"
      style="@style/normaltextview"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="2016-10-9 10:00" />

    <android.support.v7.widget.cardview
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"
      app:cardbackgroundcolor="@color/white"
      app:cardpreventcorneroverlap="true"
      app:cardusecompatpadding="true"
      app:contentpadding="10dp">

      <textview
        android:id="@+id/tv_title"
        style="@style/smallgreytextview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ellipsize="end"
        android:maxlines="2"
        android:text="。。。，看到这个场景。我看着她她看着我，说道：“怎么样，我当年的手工还不错吧。。。。。。。。。”" />

    </android.support.v7.widget.cardview>
  </linearlayout>

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

脚布局 item_foot

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="40dp"
  android:gravity="center"
  android:orientation="horizontal"
  android:id="@+id/ll"
 >


  <progressbar
    android:layout_marginright="6dp"
    android:id="@+id/progressbar"
    style="?android:attr/progressbarstylesmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center" />

  <textview
    android:id="@+id/tv"
    style="@style/smallgreytextview"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:text="@string/loading" />


</linearlayout>

toolbar

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto">

  <android.support.design.widget.appbarlayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fitssystemwindows="true">

    <android.support.v7.widget.toolbar
      android:id="@+id/toolbar"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="@color/bluestatus"
      android:minheight="?attr/actionbarsize"
      app:layout_scrollflags="scroll|enteralways"
      app:navigationicon="?attr/homeasupindicator"
      app:theme="@style/theme.appcompat.noactionbar">

    </android.support.v7.widget.toolbar>
  </android.support.design.widget.appbarlayout>

首页 mainactivity

package com.lxl.refresh;

import android.os.bundle;
import android.os.handler;
import android.support.v4.widget.swiperefreshlayout;
import android.support.v7.app.appcompatactivity;
import android.support.v7.widget.linearlayoutmanager;
import android.support.v7.widget.recyclerview;
import android.support.v7.widget.toolbar;
import android.util.log;
import android.view.view;

import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;

import butterknife.butterknife;
import butterknife.injectview;

/**
 * description：
 * author：lxl
 * date： 2016/10/9 10:15
 */
public class mainactivity extends appcompatactivity {


  @injectview(r.id.toolbar)
  toolbar toolbar;
  @injectview(r.id.recyclerview)
  recyclerview recyclerview;
  @injectview(r.id.swiperefreshlayout)
  swiperefreshlayout swiperefreshlayout;
  boolean isslidingtolast = false; //判断滚动状态
  boolean isloading;
  private list<map<string, object>> data = new arraylist<>();
  private recyclerviewadapter adapter = new recyclerviewadapter(this, data);
  private handler handler = new handler();

  @override
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_notice);
    butterknife.inject(this);
    initview();
    map<string, object> map = new hashmap<>();
    initdata();
  }

  public void initview() {
    setsupportactionbar(toolbar);
    toolbar.settitle(r.string.notice);
    toolbar.setnavigationonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        finish();
      }
    });

    swiperefreshlayout.setcolorschemeresources(r.color.bluestatus);
    swiperefreshlayout.post(new runnable() {
      @override
      public void run() {
        swiperefreshlayout.setrefreshing(true);
      }
    });

    swiperefreshlayout.setonrefreshlistener(new swiperefreshlayout.onrefreshlistener() {
      @override
      public void onrefresh() {
        handler.postdelayed(new runnable() {
          @override
          public void run() {
            data.clear();
            getdata();
          }
        }, 2000);
      }
    });
    final linearlayoutmanager layoutmanager = new linearlayoutmanager(this);
    recyclerview.setlayoutmanager(layoutmanager);
    recyclerview.setadapter(adapter);
    recyclerview.addonscrolllistener(new recyclerview.onscrolllistener() {

      @override
      public void onscrollstatechanged(recyclerview recyclerview, int newstate) {
        super.onscrollstatechanged(recyclerview, newstate);
        log.d("test", "statechanged = " + newstate); //滑动状态改变时触发有0,1,2三种状态


      }

      @override
      public void onscrolled(recyclerview recyclerview, int dx, int dy) {
        super.onscrolled(recyclerview, dx, dy);
        if (dy > 0) {
          //大于0表示正在向下滚动
          isslidingtolast = true;
        } else {
          //小于等于0表示停止或向上滚动
          isslidingtolast = false;
        }
        log.d("test", "onscrolled"); //当recyclerview滑动时触发类似点击事件的motionevent.action_move
        int lastvisibleitemposition = layoutmanager.findlastvisibleitemposition();
        if (lastvisibleitemposition + 1 == adapter.getitemcount()&& isslidingtolast) {
          log.d("test", "loading executed");//当且仅当滑动到最后一项并且手指上拉抛出时才执行

          boolean isrefreshing = swiperefreshlayout.isrefreshing();
          log.d("test", "hahh"+isrefreshing);
          if (isrefreshing) { //如何在下拉刷新则隐藏脚布局并且返回
            adapter.notifyitemremoved(adapter.getitemcount());
            return;
          }
          if (!isloading) {
            isloading = true;
            handler.postdelayed(new runnable() {
              @override
              public void run() {
                getdata(); //延时执行加载
                log.d("test", "load more completed");
                isloading = false;
              }
            }, 1000);
          }
        }
      }
    });

    //添加点击事件
    adapter.setonitemclicklistener(new recyclerviewadapter.onitemclicklistener() {
      @override
      public void onitemclick(view view, int position) {
        log.d("test", "item position = " + position);
      }

      @override
      public void onitemlongclick(view view, int position) {

      }
    });
  }


  public void initdata() { //第一次进来的时候加载数据
    handler.postdelayed(new runnable() {
      @override
      public void run() {
        getdata();
      }
    }, 1500);

  }

  /**
   * 获取测试数据
   */
  private void getdata() {
    for (int i = 0; i < 6; i++) { //每次加载六条数据
      map<string, object> map = new hashmap<>();
      data.add(map);
    }
    adapter.notifydatasetchanged();
    swiperefreshlayout.setrefreshing(false); //加载数据后收起下拉刷新
    log.d("test", adapter.getitemcount()+"");

//    adapter.notifyitemremoved(adapter.getitemcount()); //加载数据后上拉刷新的脚布局移除掉

//    adapter.footerholder.ll.setvisibility(view.gone);
    //加载数据后上拉刷新的脚布局隐藏掉
    adapter.setmcreateviewholder(new recyclerviewadapter.onholdercreate() {
      @override
      public void created() {
        if (isslidingtolast==false){
          adapter.footerholder.ll.setvisibility(view.gone);
        }else{
          adapter.footerholder.ll.setvisibility(view.visible);
        }
      }
    });
  }


}

在第106行中通过这三个条件判断就可以下拉刷新的执行。
recyclerview的适配器：recyclerviewadapter

package com.lxl.refresh;

import android.content.context;
import android.support.v7.widget.recyclerview.adapter;
import android.support.v7.widget.recyclerview.viewholder;
import android.util.log;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.linearlayout;
import android.widget.progressbar;
import android.widget.textview;

import java.util.list;

public class recyclerviewadapter extends adapter<viewholder> {

  private static final int type_item = 0;
  private static final int type_footer = 1;
  private context context;
  private list data;

  protected footviewholder footerholder;

  public recyclerviewadapter(context context, list data) {
    this.context = context;
    this.data = data;
  }
  //-------------------------------------
  public interface onholdercreate{ //定义一个viewholder回调接口
    void created();
  }

  public onholdercreate getmcreateviewholder() {
    return mcreateviewholder;
  }

  public void setmcreateviewholder(onholdercreate mcreateviewholder) {
    this.mcreateviewholder = mcreateviewholder;
  }

  private onholdercreate mcreateviewholder;

  //-------------------------------------

  public interface onitemclicklistener {
    void onitemclick(view view, int position);

    void onitemlongclick(view view, int position);
  }

  private onitemclicklistener onitemclicklistener;

  public void setonitemclicklistener(onitemclicklistener onitemclicklistener) {
    this.onitemclicklistener = onitemclicklistener;
  }

  @override
  public int getitemcount() {
    return data.size() == 0 ? 0 : data.size() + 1; //添加脚布局
  }

  @override
  public int getitemviewtype(int position) {
    if (position + 1 == getitemcount()) {
      return type_footer; //脚布局
    } else {
      return type_item; //普通item
    }
  }

  @override
  public viewholder oncreateviewholder(viewgroup parent, int viewtype) {
    if (viewtype == type_item) { //创建普通类型的item布局
      view view = layoutinflater.from(context).inflate(r.layout.item_base, parent,
          false);
      log.d("test", "创建普通类型的item布局");
      return new itemviewholder(view);
    } else if (viewtype == type_footer) { //创建脚布局类型的item布局
      view view = layoutinflater.from(context).inflate(r.layout.item_foot, parent,
          false);
      footerholder=new footviewholder(view);
      log.d("test", "创建脚布局类型的item布局");

      return footerholder;
    }
    return null;
  }


  @override
  public void onbindviewholder(final viewholder holder, int position) {
    //在oncreateviewholder执行完成后回调
    if (holder instanceof footviewholder){
      if (mcreateviewholder!=null){
        mcreateviewholder.created();
      }
    }
    if (holder instanceof itemviewholder) {
      //holder.tv.settext(data.get(position));
      if (onitemclicklistener != null) {
        holder.itemview.setonclicklistener(new view.onclicklistener() {
          @override
          public void onclick(view v) {
            int position = holder.getlayoutposition();
            onitemclicklistener.onitemclick(holder.itemview, position);
          }
        });

        holder.itemview.setonlongclicklistener(new view.onlongclicklistener() {
          @override
          public boolean onlongclick(view v) {
            int position = holder.getlayoutposition();
            onitemclicklistener.onitemlongclick(holder.itemview, position);
            return false;
          }
        });
      }
    }
  }


  static class itemviewholder extends viewholder {

    textview tv;

    public itemviewholder(view view) {
      super(view);
      tv = (textview) view.findviewbyid(r.id.tv_date);
    }
  }

   class footviewholder extends viewholder {
     linearlayout ll;
     progressbar pb;
     textview tv;
    public footviewholder(view view) {
      super(view);
      ll=(linearlayout) view.findviewbyid(r.id.ll);
      pb=(progressbar) view.findviewbyid(r.id.progressbar);
      tv=(textview) view.findviewbyid(r.id.tv);
    }
  }
}

在第30行定义一个借口用来通知下拉刷新后隐藏脚布局，主要在oncreateviewholder执行完成后回调。

看看效果图

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。