Android中Listview下拉刷新和上拉加载更多的多种实现方案

import com.itheima.pulltorefreshlistview.r;
import android.content.context;
import android.util.attributeset;
import android.view.motionevent;
import android.view.view;
import android.view.animation.rotateanimation;
import android.widget.abslistview;
import android.widget.imageview;
import android.widget.listview;
import android.widget.progressbar;
import android.widget.textview;
public class pulltorefreshlistview extends listview {
  private view headerview;
  private float downy;
  private int headerviewheight;
  /** 状态：下拉刷新 */
  private static final int state_pull_to_refresh = 0;
  /** 状态：松开刷新 */
  private static final int state_release_refresh = 1;
  /** 状态：正在刷新 */
  private static final int state_refreshing = 2;
  /** 当前状态 */
  private int currentstate = state_pull_to_refresh;  // 默认是下拉刷新状态
  private imageview iv_arrow;
  private progressbar progress_bar;
  private textview tv_state;
  private rotateanimation upanim;
  private rotateanimation downanim;
  private onrefreshinglistener monrefreshinglistener;
  private view footerview;
  private int footerviewheight;
  /** 正在加载更多 */
  private boolean loadingmore;
  public pulltorefreshlistview(context context, attributeset attrs) {
    super(context, attrs);
    initheaderview();
    initfooterview();
  }
  private void initheaderview() {
    headerview = view.inflate(getcontext(), r.layout.header_view, null);
    iv_arrow = (imageview) headerview.findviewbyid(r.id.iv_arrow);
    progress_bar = (progressbar) headerview.findviewbyid(r.id.progress_bar);
    showrefreshingprogressbar(false);
    tv_state = (textview) headerview.findviewbyid(r.id.tv_state);
    headerview.measure(0, 0);  // 主动触发测量，mesure内部会调用onmeasure
    headerviewheight = headerview.getmeasuredheight();
    hideheaderview();
    super.addheaderview(headerview);
    upanim = createrotateanim(0f, -180f);
    downanim = createrotateanim(-180f, -360f);
  }
  private void initfooterview() {
    footerview = view.inflate(getcontext(), r.layout.footer_view, null);
    footerview.measure(0, 0);// 主动触发测量，mesure内部会调用onmeasure
    footerviewheight = footerview.getmeasuredheight();
    hidefooterview();
    super.addfooterview(footerview);
    super.setonscrolllistener(new onscrolllistener() {
      // 当listview滚动的状态发生改变的时候会调用这个方法
      @override
      public void onscrollstatechanged(abslistview view, int scrollstate) {
        if (scrollstate == onscrolllistener.scroll_state_idle  // listview处于空闲状态
            && getlastvisibleposition() == getcount() - 1  // 界面上可见的最后一条item是listview中最后的一条item
            && loadingmore == false              // 如果当前没有去做正在加载更多的事情
            ) {
          loadingmore = true;
          showfooterview();
          setselection(getcount() - 1);
          if (monrefreshinglistener != null) {
            monrefreshinglistener.onloadmore();
          }
        }
      }
      // 当listview滚动的时候会调用这个方法
      @override
      public void onscroll(abslistview view, int firstvisibleitem, int visibleitemcount, int totalitemcount) {
      }
    });
  }
  private void hidefooterview() {
    int paddingtop = -footerviewheight;
    setfooterviewpaddingtop(paddingtop);
  }
  private void showfooterview() {
    int paddingtop = 0;
    setfooterviewpaddingtop(paddingtop);
  }
  private void setfooterviewpaddingtop(int paddingtop) {
    footerview.setpadding(0, paddingtop, 0, 0);
  }
  /**
   * 设置显示进度的圈圈
   * @param showprogressbar 如果是true，则显示progressbar，否则的话显示箭头
   */
  private void showrefreshingprogressbar(boolean showprogressbar) {
    progress_bar.setvisibility(showprogressbar ? view.visible : view.gone);
    iv_arrow.setvisibility(!showprogressbar ? view.visible : view.gone);
    if (showprogressbar) {
      iv_arrow.clearanimation();  // 有动画的view要清除动画才能真正的隐藏
    }
  }
  /**
   * 创建旋转动画
   * @param fromdegrees 从哪个角度开始转
   * @param todegrees 转到哪个角度
   * @return 
   */
  private rotateanimation createrotateanim(float fromdegrees, float todegrees) {
    int pivotxtype = rotateanimation.relative_to_self;    // 旋转点的参照物
    int pivotytype = rotateanimation.relative_to_self;    // 旋转点的参照物
    float pivotxvalue = 0.5f;  // 旋转点x方向的位置
    float pivotyvalue = 0.5f;  // 旋转点y方向的位置
    rotateanimation ra = new rotateanimation(fromdegrees, todegrees, pivotxtype, pivotxvalue, pivotytype, pivotyvalue);
    ra.setduration(300);
    ra.setfillafter(true);  // 让动画停留在结束位置
    return ra;
  }
  /** 隐藏headerview */
  private void hideheaderview() {
    int paddingtop = -headerviewheight;
    setheaderviewpaddingtop(paddingtop);
  }
  /** 显示headerview */
  private void showheaderview() {
    int paddingtop = 0;
    setheaderviewpaddingtop(paddingtop);
  }
  /**
   * 设置headerview的paddingtop
   * @param paddingtop
   */
  private void setheaderviewpaddingtop(int paddingtop) {
    headerview.setpadding(0, paddingtop, 0, 0);
  }
  @override
  public boolean ontouchevent(motionevent ev) {
    switch (ev.getaction()) {
    case motionevent.action_down:
      downy = ev.gety();
      break;
    case motionevent.action_move:
      if (currentstate == state_refreshing) {
        // 如果当前已经是“正在刷新“的状态了，则不用去处理下拉刷新了
        return super.ontouchevent(ev);
      }
      int fingermovedistancey = (int) (ev.gety() - downy);    // 手指移动的距离
      // 如果是向下滑动，并且界面上可见的第一条item是listview的索引为0的item时我们才处理下拉刷新的操作
      if (fingermovedistancey > 0 && getfirstvisibleposition() == 0) {
        int paddingtop = -headerviewheight + fingermovedistancey;
        setheaderviewpaddingtop(paddingtop);
        if (paddingtop < 0 && currentstate != state_pull_to_refresh) {
          // 如果paddingtop小于0，说明headerview没有完全显示出来，则进入下拉刷新的状态
          currentstate = state_pull_to_refresh;
          tv_state.settext("下拉刷新");
          iv_arrow.startanimation(downanim);
          showrefreshingprogressbar(false);
          // 让箭头转一下
        } else if (paddingtop >= 0 && currentstate != state_release_refresh) {
          // 如果paddingtop>=0，说明headerview已经完全显示出来，则进入松开刷新的状态
          currentstate = state_release_refresh;
          tv_state.settext("松开刷新");
          iv_arrow.startanimation(upanim);
          showrefreshingprogressbar(false);
        }
        return true;
      }
      break;
    case motionevent.action_up:
      if (currentstate == state_release_refresh) {
        // 如果当前状态是松开刷新，并且抬起了手，则进入正在刷新状态
        currentstate = state_refreshing;
        tv_state.settext("正在刷新");
        showrefreshingprogressbar(true);
        showheaderview();
        if (monrefreshinglistener != null) {
          monrefreshinglistener.onrefreshing();
        }
      } else if (currentstate == state_pull_to_refresh) {
        // 如果抬起手时是下拉刷新状态，则把headerview完成隐藏
        hideheaderview();
      }
      break;
    }
    return super.ontouchevent(ev);
  }
  public void setonrefreshinglistener(onrefreshinglistener monrefreshinglistener) {
    this.monrefreshinglistener = monrefreshinglistener;
  }
  /** listview刷新的监听器 */
  public interface onrefreshinglistener {
    /** 当listview可以刷新数据的时候会调用这个方法 */
    void onrefreshing();
    /** 当listview可以加载更多 的时候会调用这个方法 */
    void onloadmore();
  }
  /** 联网刷新数据的操作已经完成了 */
  public void onrefreshcomplete() {
    hideheaderview();
    currentstate = state_pull_to_refresh;
    showrefreshingprogressbar(false);
  }
  /** 加载更多新数据的操作已经完成了 */
  public void onloadmorecomplete() {
    hidefooterview();
    loadingmore = false;
  }
}

@override
  public int getviewtypecount() {
    return super.getviewtypecount() + 1;
  }
  @override
  public int getitemviewtype(int position) {
    if (position == getcount() - 1) {
      return 0;
    } else {
      return addviewtype(position); //构造一个方法出来，方便子类修改，添加更多的样式
    }
  }
  public int addviewtype(int position) {
    return 1;
  }

 @override
  public view getview(int position, view convertview, viewgroup parent) {
    baseholdle holdle;
    if (convertview == null) {
      if (getitemviewtype(position) == 0) { //type为0 表示应该加载加载更多的视图
        holdle = getloadmoreholdle();
      } else {                //否则为普通视图
        holdle = getspecialbaseholdle(position);
      }
    } else {
      holdle = (baseholdle) convertview.gettag();
    }
    if (getitemviewtype(position) == 0) {   //加载更多视图，请求网络获取数据
      if (havemore()) {
        holdle.setdataandrefreshholdleview(loadmoreholdle.loadmore_loding);
        triggleloadmoredata();
      } else {               
        holdle.setdataandrefreshholdleview(loadmoreholdle.loadmore_none);
      }
    } else {                 //普通视图视图，请求网络获取数据
      t data = (t) mdata.get(position);
      holdle.setdataandrefreshholdleview(data);
    }
    mholdleview = holdle.mholdleview;
    mholdleview.setscalex(0.6f);
    mholdleview.setscaley(0.6f);
    viewcompat.animate(mholdleview).scalex(1).scaley(1).setduration(400).setinterpolator(new overshootinterpolator(4)).start();
    return mholdleview;
  }

private baseholdle getloadmoreholdle() {
    if (mloadmoreholdle == null) {
      mloadmoreholdle = new loadmoreholdle();
    }
    return mloadmoreholdle;
  }
  public class loadmoreholdle extends baseholdle {
  @bind(r.id.item_loadmore_container_loading)
  linearlayout itemloadmorecontainerloading;
  @bind(r.id.item_loadmore_container_retry)
  linearlayout itemloadmorecontainerretry;
  @bind(r.id.item_loadmore_tv_retry)
  textview item_loadmore_tv_retry;
  public static final int loadmore_loding = 0;
  public static final int loadmore_error = 1;
  public static final int loadmore_none = 2;
  private int mcurretstate;
  @override
  public void refreshholdleview(object data) {
    itemloadmorecontainerloading.setvisibility(view.gone);
    itemloadmorecontainerretry.setvisibility(view.gone);
    mcurretstate = (int) data;
    switch (mcurretstate) {
      case loadmore_loding:
        itemloadmorecontainerloading.setvisibility(view.visible);
        break;
      case loadmore_error:
        itemloadmorecontainerretry.setvisibility(view.visible);
        break;
      case loadmore_none:
        break;
    }
  }
  @override
  public view ininviewholdle() {
    view view = view.inflate(uiutils.getcontext(), r.layout.itemloadmore, null);
    butterknife.bind(this, view);
    return view;
  }
}
//holder基类，提取公共的方法
public abstract class baseholdle<t> {
  public view mholdleview;
  public t mdata;
  public baseholdle() {
    mholdleview = ininviewholdle();
    mholdleview.settag(this);
  }
  public void setdataandrefreshholdleview(t mdata) {
    this.mdata = mdata;
    refreshholdleview(mdata);
  }
  public abstract void refreshholdleview(t data);
  public abstract view ininviewholdle();
}

 refreshlayout = (swiperefreshlayout) findviewbyid(r.id.refresh);
   refreshlayout.setonrefreshlistener(this); 
   refreshlayout.setcolorschemeresources(android.r.color.holo_blue_bright,
      android.r.color.holo_green_light,android.r.color.holo_orange_light,
      android.r.color.holo_red_light);
   refreshlayout.setprogressbackgroundcolor(r.color.refresh_bg);
   refreshlayout.setprogressbackgroundcolor(r.color.refresh_bg);

@override  
  public void onrefresh() { 
   refreshlayout.postdelayed(new runnable() {
    @override
    public void run() {
     //请求网络，获取数据        
     refreshlayout.setrefreshing(false);
    }
    },3000);
  }