Android RecyclerView实现下拉刷新和上拉加载

<android.support.v4.widget.swiperefreshlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/swipe_refresh"
 android:orientation="vertical" android:layout_width="match_parent"
 android:layout_height="match_parent">

 <android.support.v7.widget.recyclerview
  android:id="@+id/swipe_target"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:scrollbars="none" />

</android.support.v4.widget.swiperefreshlayout>

 @override
 public void onscrolled(recyclerview recyclerview, int dx, int dy) {

  /**
   * 获取布局参数
   */
  recyclerview.layoutmanager layoutmanager = recyclerview.getlayoutmanager();

  //如果为null，第一次运行，确定布局类型
  if (mlayoutmanagertype == null) {
   if (layoutmanager instanceof linearlayoutmanager) {
    mlayoutmanagertype = layoutmanagertype.linear_layout;
   } else if (layoutmanager instanceof gridlayoutmanager) {
    mlayoutmanagertype = layoutmanagertype.grid_layout;
   } else if (layoutmanager instanceof staggeredgridlayoutmanager) {
    mlayoutmanagertype = layoutmanagertype.staggered_grid_layout;
   } else {
    throw new runtimeexception("layoutmanager should be linearlayoutmanager,gridlayoutmanager,staggeredgridlayoutmanager");
   }
  }

  //对于不太能够的布局参数，不同的方法获取到当前显示的最后一个条目数
  switch (mlayoutmanagertype) {
   case linear_layout:
    mlastvisibleitemposition = ((linearlayoutmanager) layoutmanager).findlastvisibleitemposition();
    break;
   case grid_layout:
    mlastvisibleitemposition = ((gridlayoutmanager) layoutmanager).findlastvisibleitemposition();
    break;
   case staggered_grid_layout:
    staggeredgridlayoutmanager staggeredgridlayoutmanager = (staggeredgridlayoutmanager) layoutmanager;
    if (mlastpostions == null) {
     mlastpostions = new int[staggeredgridlayoutmanager.getspancount()];
    }
    staggeredgridlayoutmanager.findlastvisibleitempositions(mlastpostions);
    mlastvisibleitemposition = findmax(mlastpostions);
    break;
   default:
    break;
  }

 }

/**
 *
 * recycleview的布局管理器的类型
 * created by alex_mahao on 2016/5/10.
 */
public enum layoutmanagertype {
 linear_layout,
 grid_layout,
 staggered_grid_layout
}

 /**
  * 当是瀑布流时，获取到的是每一个瀑布最下方显示的条目，通过条目进行对比
  */
 private int findmax(int[] lastpositions) {
  int max = lastpositions[0];
  for (int value : lastpositions) {
   if (value > max) {
    max = value;
   }
  }
  return max;
 }

 @override
 public void onscrollstatechanged(recyclerview recyclerview, int newstate) {

  recyclerview.layoutmanager layoutmanager = recyclerview.getlayoutmanager();

  //recycleview 显示的条目数
  int visiblecount = layoutmanager.getchildcount();

  //显示数据总数
  int totalcount = layoutmanager.getitemcount();


  // 四个条件，分别是是否有数据，状态是否是滑动停止状态，显示的最大条目是否大于整个数据（注意偏移量），是否正在加载数据
  if(visiblecount>0
    &&newstate==recyclerview.scroll_state_idle
    &&mlastvisibleitemposition>=totalcount-1
    &&!isloaddata){
   //可以加载数据
   isloaddata = true;
  }

 }

 public void setloaddatastatus(boolean isloaddata){
  this.isloaddata = isloaddata;
 }

/**
 * 实现上拉加载的监听：加载条件：滑动到最后，且是停止状态，则开始加载数据
 * created by alex_mahao on 2016/5/10.
 */
public class loaddatascrollcontroller extends recyclerview.onscrolllistener implements swiperefreshlayout.onrefreshlistener {

 /**
  * 当前布局管理器的类型
  */
 private layoutmanagertype mlayoutmanagertype;


 /**
  * 当前recycleview显示的最大条目
  */
 private int mlastvisibleitemposition;


 /**
  * 每列的最后一个条目
  */
 private int[] mlastpostions;


 /**
  * 是否正在加载数据 包括刷新和向上加载更多
  */
 private boolean isloaddata = false;


 /**
  * 回调接口
  */
 private onrecyclerefreshlistener mlistener;


 public loaddatascrollcontroller(onrecyclerefreshlistener onrecyclerefreshlistener) {
  this.mlistener = onrecyclerefreshlistener;
 }

 @override
 public void onscrolled(recyclerview recyclerview, int dx, int dy) {

  /**
   * 获取布局参数
   */
  recyclerview.layoutmanager layoutmanager = recyclerview.getlayoutmanager();

  //如果为null，第一次运行，确定布局类型
  if (mlayoutmanagertype == null) {
   if (layoutmanager instanceof linearlayoutmanager) {
    mlayoutmanagertype = layoutmanagertype.linear_layout;
   } else if (layoutmanager instanceof gridlayoutmanager) {
    mlayoutmanagertype = layoutmanagertype.grid_layout;
   } else if (layoutmanager instanceof staggeredgridlayoutmanager) {
    mlayoutmanagertype = layoutmanagertype.staggered_grid_layout;
   } else {
    throw new runtimeexception("layoutmanager should be linearlayoutmanager,gridlayoutmanager,staggeredgridlayoutmanager");
   }
  }

  //对于不太能够的布局参数，不同的方法获取到当前显示的最后一个条目数
  switch (mlayoutmanagertype) {
   case linear_layout:
    mlastvisibleitemposition = ((linearlayoutmanager) layoutmanager).findlastvisibleitemposition();
    break;
   case grid_layout:
    mlastvisibleitemposition = ((gridlayoutmanager) layoutmanager).findlastvisibleitemposition();
    break;
   case staggered_grid_layout:
    staggeredgridlayoutmanager staggeredgridlayoutmanager = (staggeredgridlayoutmanager) layoutmanager;
    if (mlastpostions == null) {
     mlastpostions = new int[staggeredgridlayoutmanager.getspancount()];
    }
    staggeredgridlayoutmanager.findlastvisibleitempositions(mlastpostions);
    mlastvisibleitemposition = findmax(mlastpostions);
    break;
   default:
    break;
  }

 }

 @override
 public void onscrollstatechanged(recyclerview recyclerview, int newstate) {

  recyclerview.layoutmanager layoutmanager = recyclerview.getlayoutmanager();

  //recycleview 显示的条目数
  int visiblecount = layoutmanager.getchildcount();

  //显示数据总数
  int totalcount = layoutmanager.getitemcount();


  // 四个条件，分别是是否有数据，状态是否是滑动停止状态，显示的最大条目是否大于整个数据（注意偏移量），是否正在加载数据
  if(visiblecount>0
    &&newstate==recyclerview.scroll_state_idle
    &&mlastvisibleitemposition>=totalcount-1
    &&!isloaddata){
   //可以加载数据
   if(mlistener!=null){
    isloaddata = true;
    mlistener.loadmore();
   }
  }

 }


 /**
  * 当是瀑布流时，获取到的是每一个瀑布最下方显示的条目，通过条目进行对比
  */
 private int findmax(int[] lastpositions) {
  int max = lastpositions[0];
  for (int value : lastpositions) {
   if (value > max) {
    max = value;
   }
  }
  return max;
 }


 public void setloaddatastatus(boolean isloaddata){
  this.isloaddata = isloaddata;
 }

 @override
 public void onrefresh() {
  //刷新数据的方法
  if(mlistener!=null){
   isloaddata = true;
   mlistener.refresh();
  }

 }

 /**
  * 数据加载接口回调
  */
 interface onrecyclerefreshlistener{
  void refresh();
  void loadmore();
 }
}

/**
 * 使用原生的swiperefreshlayout和代码判断
 *  实现recyclewview 的刷新和加载更多
 *
 * created by alex_mahao on 2016/5/10.
 */
public class swiperefreshactivity extends appcompatactivity implements loaddatascrollcontroller.onrecyclerefreshlistener {


 private swiperefreshlayout mswiperefresh;

 private recyclerview mrecycle;

 private homeadapter madapter;

 private loaddatascrollcontroller mcontroller;


 private progressdialog pd;

 @override
 protected void oncreate(@nullable bundle savedinstancestate) {
  super.oncreate(savedinstancestate);

  setcontentview(r.layout.activity_recycle_swiperefresh);

  mrecycle = ((recyclerview) findviewbyid(r.id.swipe_target));

  mswiperefresh = ((swiperefreshlayout) findviewbyid(r.id.swipe_refresh));

  mswiperefresh.setcolorschemecolors(color.red,color.green,color.blue);

  /**
   * 创建控制器，同时使当前activity实现数据监听回调接口
   */
  mcontroller = new loaddatascrollcontroller(this);



  madapter = new homeadapter();

  //设置垂直的线性布局管理器，orientation --> vertical:垂直 horizontal:水平
  linearlayoutmanager layoutmanager = new linearlayoutmanager(this);
  layoutmanager.setorientation(linearlayoutmanager.vertical);

  //staggeredgridlayoutmanager layoutmanager = new staggeredgridlayoutmanager(2,staggeredgridlayoutmanager.vertical);

  //添加分割线
  mrecycle.additemdecoration(new divideritemdecoration(getapplicationcontext(), divideritemdecoration.vertical_list));


  mrecycle.setlayoutmanager(layoutmanager);

  mrecycle.setitemanimator(new defaultitemanimator());

  mrecycle.setadapter(madapter);

  madapter.refresh();

  /**
   * 设置监听
   */
  mrecycle.addonscrolllistener(mcontroller);

  mswiperefresh.setonrefreshlistener(mcontroller);

 }

 @override
 public void refresh() {
  //刷新的接口调
  mswiperefresh.postdelayed(new runnable() {
   @override
   public void run() {
    madapter.refresh();
    mswiperefresh.setrefreshing(false);
    mcontroller.setloaddatastatus(false);
   }
  },2000);
 }

 @override
 public void loadmore() {
  //加载更多的接口回调
  pd = new progressdialog(this);
  pd.show();
  mswiperefresh.postdelayed(new runnable() {
   @override
   public void run() {
    madapter.add();
    //设置数据加载结束的监听状态
    mcontroller.setloaddatastatus(false);
    pd.dismiss();
   }
  },2000);
 }
}

 repositories {
  maven { url "https://jitpack.io" }
   }

 compile 'com.github.aspsine:swipetoloadlayout:1.0.3'

/**
 * 基础的refreshheadview
 */
public class refreshheaderview extends textview implements swiperefreshtrigger, swipetrigger {

 public refreshheaderview(context context) {
  super(context);
 }

 public refreshheaderview(context context, attributeset attrs) {
  super(context, attrs);
 }

 public refreshheaderview(context context, attributeset attrs, int defstyleattr) {
  super(context, attrs, defstyleattr);
 }

 @targetapi(build.version_codes.lollipop)
 public refreshheaderview(context context, attributeset attrs, int defstyleattr, int defstyleres) {
  super(context, attrs, defstyleattr, defstyleres);
 }

 @override
 public void onrefresh() {
  //下拉到一定位置松开之后，调用此方法
  settext("refresh");

  log.i("info","onrefresh");
 }

 @override
 public void onprepare() {

  //下拉之前调用此方法
  log.i("info","onprepare");
 }

 @override
 public void onmove(int yscrolled, boolean iscomplete, boolean automatic) {
  if (!iscomplete) {
   //当前y轴偏移量大于控件高度时，标识下拉到界限，显示“松开已刷新”
   if (yscrolled >= getheight()) {

   } else {
    //未达到偏移量

   }
  } 
  log.i("info","onmove");
 }

 @override
 public void onrelease() {
  //达到一定滑动距离，松开刷新时调用
  settext("onrelease");
  log.i("info","onrelease");
 }

 @override
 public void oncomplete() {
  //加载完成之后调用此方法
  settext("complete");
  log.i("info","oncomplete");
 }

 @override
 public void onreset() {
  //重置
  settext("onreset");
  log.i("info","onreset");
 }
}

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="#ecedf0"
 >

 <com.aspsine.swipetoloadlayout.swipetoloadlayout
  android:id="@+id/swipetoloadlayout"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <com.mahao.alex.systemwidgetdemo.recycleview.swipetoloadlayout.refreshheaderview
   android:id="@+id/swipe_refresh_header"
   android:layout_width="match_parent"
   android:layout_height="wrap_content" />

  <android.support.v7.widget.recyclerview
   android:id="@+id/swipe_target"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:scrollbars="vertical" />

  <com.mahao.alex.systemwidgetdemo.recycleview.swipetoloadlayout.loadermoreview
   android:id="@+id/swipe_load_more_footer"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:gravity="center"
   android:padding="20dp" />
 </com.aspsine.swipetoloadlayout.swipetoloadlayout>


</relativelayout>

/**
 * circleview 圆盘控件，可以旋转
 * created by alex_mahao on 2016/5/10.
 */
public class circleview extends view {

 /**
  * 控件的半径
  */
 private int mradius;

 /**
  * 绘制弧形的画笔
  */
 private paint marcpaint;

 /**
  * 绘制弧形的区域
  */
 private rectf mrange;


 private int[] colors = {color.red, color.blue, color.yellow, color.green};

 public circleview(context context) {
  this(context, null, 0);
 }

 public circleview(context context, attributeset attrs) {
  this(context, attrs, 0);
 }

 public circleview(context context, attributeset attrs, int defstyleattr) {
  super(context, attrs, defstyleattr);

  init();
 }

 private void init() {
  marcpaint = new paint();
  marcpaint.setantialias(true);
  marcpaint.setdither(true);
  marcpaint.setstyle(paint.style.fill);
 }

 @override
 protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
  super.onmeasure(widthmeasurespec, heightmeasurespec);

  int width = 0;
  int height = 0;

  int widthsize = measurespec.getsize(widthmeasurespec);
  int widthmode = measurespec.getmode(widthmeasurespec);

  int heightsize = measurespec.getsize(heightmeasurespec);
  int heightmode = measurespec.getmode(heightmeasurespec);


  if (widthmode == measurespec.exactly) {
   width = widthsize;
  } else {
   width = (int) typedvalue.applydimension(typedvalue.complex_unit_dip, 45, getresources().getdisplaymetrics());
  }

  if (heightmode == measurespec.exactly) {
   height = heightsize;
  } else {
   height = (int) typedvalue.applydimension(typedvalue.complex_unit_dip, 45, getresources().getdisplaymetrics());
  }

  //获取半径
  mradius = math.min(width, height) / 2;
  /**
   * 设置宽高为固定值
   */
  setmeasureddimension(mradius * 2, mradius * 2);

   mrange = new rectf(0, 0, mradius * 2, mradius * 2);
 }


 @override
 protected void ondraw(canvas canvas) {

  float degree = 360/colors.length/2f;

  for (int i = 0; i < 8; i++) {
   marcpaint.setcolor(colors[i%4]);
   canvas.drawarc(mrange,-90f+degree*i,degree,true,marcpaint);
  }

 }
}

**
 * 自定义的下拉刷新控件 头部
 * created by alex_mahao on 2016/5/10.
 */
public class circlerefreshheaderview extends relativelayout implements swipetrigger, swiperefreshtrigger {

 circleview mcircleview;

 textview mdesctext;

 private objectanimator anim;

 private boolean isrelease;

 public circlerefreshheaderview(context context) {
  this(context, null, 0);
 }

 public circlerefreshheaderview(context context, attributeset attrs) {
  this(context, attrs, 0);
 }

 public circlerefreshheaderview(context context, attributeset attrs, int defstyleattr) {
  super(context, attrs, defstyleattr);

  initview();
 }

 /**
  * 初始化布局
  */
 private void initview() {

  int circlewidth = (int) typedvalue.applydimension(typedvalue.complex_unit_dip, 30, getresources().getdisplaymetrics());

  mcircleview = new circleview(getcontext());

  linearlayout.layoutparams circleparams = new linearlayout.layoutparams(circlewidth,circlewidth);

  mcircleview.setlayoutparams(circleparams);

  mdesctext = new textview(getcontext());

  linearlayout.layoutparams descparams = new linearlayout.layoutparams(circlewidth*3, viewgroup.layoutparams.wrap_content);

  descparams.gravity = gravity.center;
  descparams.setmargins(circlewidth/2,0,0,0);
  mdesctext.setlayoutparams(descparams);
  mdesctext.settextsize(12);
  mdesctext.settextcolor(color.gray);
  mdesctext.settext("下拉刷新");

  //添加线性的父布局
  linearlayout ll = new linearlayout(getcontext());
  relativelayout.layoutparams llparams = new layoutparams(viewgroup.layoutparams.wrap_content, viewgroup.layoutparams.wrap_content);
  llparams.addrule(center_in_parent);
  ll.setlayoutparams(llparams);
  ll.setpadding(10,10,10,10);

  ll.addview(mcircleview);
  ll.addview(mdesctext);

  addview(ll);
 }

 @override
 public void onrefresh() {

  //开始刷新，启动动画
  anim = objectanimator.offloat(mcircleview, "rotation", mcircleview.getrotation(), mcircleview.getrotation()+360f)
    .setduration(500);
  anim.setrepeatcount(valueanimator.infinite);
  anim.setrepeatmode(valueanimator.restart);
  anim.start();

  mdesctext.settext("正在加载数据");
 }

 @override
 public void onprepare() {
  isrelease = false;
 }

 @override
 public void onmove(int yscroll, boolean iscomplete, boolean b1) {
  if (!iscomplete) {
   if (yscroll < getheight()) {
    mdesctext.settext("下拉刷新");
   } else {
    mdesctext.settext("松开刷新更多");
   }

   //如果是仍在下拉状态，则圆环跟随滑动进行滚动
   if (!isrelease)
    mcircleview.setrotation(((float) yscroll) / getheight() * 360f);
  }


 }

 @override
 public void onrelease() {
  isrelease = true;
 }

 @override
 public void oncomplete() {
  anim.cancel();
  mdesctext.settext("加载完成");
 }

 @override
 public void onreset() {
  //重置时，将动画置为初始状态
  mcircleview.setrotation(0f);
 }
}

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="#ecedf0"
 >

 <com.aspsine.swipetoloadlayout.swipetoloadlayout
  android:id="@+id/swipetoloadlayout"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <com.mahao.alex.systemwidgetdemo.recycleview.swipetoloadlayout.circlerefreshheaderview
   android:id="@+id/swipe_refresh_header"
   android:layout_width="match_parent"
   android:layout_height="wrap_content" />

  <android.support.v7.widget.recyclerview
   android:id="@+id/swipe_target"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:scrollbars="vertical" />

  <com.mahao.alex.systemwidgetdemo.recycleview.swipetoloadlayout.loadermoreview
   android:id="@+id/swipe_load_more_footer"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:gravity="center"
   android:padding="20dp" />
 </com.aspsine.swipetoloadlayout.swipetoloadlayout>


</relativelayout>

public class swipetolayoutactivity extends appcompatactivity implements onrefreshlistener, onloadmorelistener {



 private recyclerview mrecycleview;

 swipetoloadlayout swipetoloadlayout;

 private homeadapter adapter;


 @override
 protected void oncreate(@nullable bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_recycle_swipetolayout);


  swipetoloadlayout = ((swipetoloadlayout) findviewbyid(r.id.swipetoloadlayout));


  mrecycleview = ((recyclerview) findviewbyid(r.id.swipe_target));


  adapter = new homeadapter();

  //设置垂直的线性布局管理器，orientation --> vertical:垂直 horizontal:水平
  linearlayoutmanager layoutmanager = new linearlayoutmanager(this);
  layoutmanager.setorientation(linearlayoutmanager.vertical);

//  staggeredgridlayoutmanager layoutmanager = new staggeredgridlayoutmanager(2,staggeredgridlayoutmanager.vertical);

  //添加分割线
  mrecycleview.additemdecoration(new divideritemdecoration(getapplicationcontext(), divideritemdecoration.vertical_list));

  mrecycleview.setlayoutmanager(layoutmanager);

  mrecycleview.setitemanimator(new defaultitemanimator());

  mrecycleview.setadapter(adapter);

  adapter.refresh();

  /**
   * 设置下拉刷新和上拉加载监听
   */
  swipetoloadlayout.setonrefreshlistener(this);
  swipetoloadlayout.setonloadmorelistener(this);

 }




 @override
 public void onrefresh() {
  swipetoloadlayout.postdelayed(new runnable() {
   @override
   public void run() {
    adapter.refresh();
    swipetoloadlayout.setrefreshing(false);
   }
  },2000);
 }

 @override
 public void onloadmore() {
  swipetoloadlayout.postdelayed(new runnable() {
   @override
   public void run() {

    adapter.add();
    swipetoloadlayout.setloadingmore(false);
   }
  },2000);
 }
}

this.mheaderview = this.findviewbyid(id.swipe_refresh_header);
 this.mtargetview = this.findviewbyid(id.swipe_target);
 this.mfooterview = this.findviewbyid(id.swipe_load_more_footer);