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Android下拉刷新上拉加载控件(适用于所有View)

2020-01-02 07:00:17
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     前面写过一篇关于下拉刷新控件的文章下拉刷新控件终结者:PullToRefreshLayout,后来看到好多人还有上拉加载更多的需求,于是就在前面下拉刷新控件的基础上进行了改进,加了上拉加载的功能。不仅如此,我已经把它改成了对所有View都通用!可以随心所欲使用这两个功能~~

    我做了一个大集合的demo,实现了ListView、GridView、ExpandableListView、ScrollView、WebView、ImageView、TextView的下拉刷新和上拉加载。后面会提供demo的下载地址,最新代码已上传到github:https://github.com/jingchenUSTC/PullToRefreshAndLoad

依照惯例,下面将会是一大波效果图:

demo首页也是可下拉的ListView,在底下可以加入table:

                                            

ListView:

                

GridView:

                

ExpandableListView:

                

ScrollView:

               

WebView:

               

ImageView:

                

TextView:

                

很不错吧?最后的ImageView和TextView是最简单的,直接在下面的接口方法里返回true。
增加上拉加载很简单,和管理下拉头一样,再多管理一个上拉头,也不费事;至于把它改成通用的就需要统一一下View的行为了,为此,我定义了这样一个接口:
package com.jingchen.pulltorefresh.pullableview; 
 
public interface Pullable 

    /**
     * 判断是否可以下拉,如果不需要下拉功能可以直接return false
     * 
     * @return true如果可以下拉否则返回false
     */ 
    boolean canPullDown(); 
 
    /**
     * 判断是否可以上拉,如果不需要上拉功能可以直接return false
     * 
     * @return true如果可以上拉否则返回false
     */ 
    boolean canPullUp(); 

从接口名就可以看出它是一个提供判断是否可拉的方法的接口。这个接口的两个方法,canPullDown()是判断何时可以下拉的方法,canPullUp()则是判断何时可以上拉,我在demo中的判断是滑到顶部的时候可以下拉,滑到底部的时候可以上拉。所有需要上拉和下拉的View都需要实现这个接口。后面会给出一些View的实现。先来看看改进后的自定义的布局PullToRefreshLayout,增加了一个上拉头,下拉头和上拉头之间的View是实现了Pullable接口的pullableView。相比前面的版本,这里有改动的需要注意的地方如下:
1、增加了上拉头,相应的也增加了控制变量。

2、拉动时消除content_view事件防止误触发不再使用反射,直接设置                       event.setAction(MotionEvent.ACTION_CANCEL)。

3、消除了拉动过程中的多点触碰导致的剧变。

4、不再设置content_view的onTouListener,让使用者可以更加自由的设置监听器。

这个PullToRefreshLayout只负责管理三个控件,如果一个View需要有上拉下拉功能则只需实现接口就行了。下面看PullToRefreshLayout的代码,注释写了好多:

package com.jingchen.pulltorefresh;  import java.util.Timer; import java.util.TimerTask;  import android.content.Context; import android.graphics.Canvas; import android.graphics.LinearGradient; import android.graphics.Paint; import android.graphics.Paint.Style; import android.graphics.RectF; import android.graphics.Shader.TileMode; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.animation.AnimationUtils; import android.view.animation.LinearInterpolator; import android.view.animation.RotateAnimation; import android.widget.RelativeLayout; import android.widget.TextView;  import com.jingchen.pulltorefresh.pullableview.Pullable;  /**  * 自定义的布局,用来管理三个子控件,其中一个是下拉头,一个是包含内容的pullableView(可以是实现Pullable接口的的任何View),  * 还有一个上拉头  *  * @author 陈靖  */ public class PullToRefreshLayout extends RelativeLayout {  public static final String TAG = "PullToRefreshLayout";  // 初始状态  public static final int INIT = 0;  // 释放刷新  public static final int RELEASE_TO_REFRESH = 1;  // 正在刷新  public static final int REFRESHING = 2;  // 释放加载  public static final int RELEASE_TO_LOAD = 3;  // 正在加载  public static final int LOADING = 4;  // 操作完毕  public static final int DONE = 5;  // 当前状态  private int state = INIT;  // 刷新回调接口  private OnRefreshListener mListener;  // 刷新成功  public static final int SUCCEED = 0;  // 刷新失败  public static final int FAIL = 1;  // 按下Y坐标,上一个事件点Y坐标  private float downY, lastY;   // 下拉的距离。注意:pullDownY和pullUpY不可能同时不为0  public float pullDownY = 0;  // 上拉的距离  private float pullUpY = 0;   // 释放刷新的距离  private float refreshDist = 200;  // 释放加载的距离  private float loadmoreDist = 200;   private MyTimer timer;  // 回滚速度  public float MOVE_SPEED = 8;  // 第一次执行布局  private boolean isLayout = false;  // 在刷新过程中滑动操作  private boolean isTouch = false;  // 手指滑动距离与下拉头的滑动距离比,中间会随正切函数变化  private float radio = 2;   // 下拉箭头的转180°动画  private RotateAnimation rotateAnimation;  // 均匀旋转动画  private RotateAnimation refreshingAnimation;   // 下拉头  private View refreshView;  // 下拉的箭头  private View pullView;  // 正在刷新的图标  private View refreshingView;  // 刷新结果图标  private View refreshStateImageView;  // 刷新结果:成功或失败  private TextView refreshStateTextView;   // 上拉头  private View loadmoreView;  // 上拉的箭头  private View pullUpView;  // 正在加载的图标  private View loadingView;  // 加载结果图标  private View loadStateImageView;  // 加载结果:成功或失败  private TextView loadStateTextView;   // 实现了Pullable接口的View  private View pullableView;  // 过滤多点触碰  private int mEvents;  // 这两个变量用来控制pull的方向,如果不加控制,当情况满足可上拉又可下拉时没法下拉  private boolean canPullDown = true;  private boolean canPullUp = true;   /**  * 执行自动回滚的handler  */  Handler updateHandler = new Handler()  {   @Override  public void handleMessage(Message msg)  {  // 回弹速度随下拉距离moveDeltaY增大而增大  MOVE_SPEED = (float) (8 + 5 * Math.tan(Math.PI / 2   / getMeasuredHeight() * (pullDownY + Math.abs(pullUpY))));  if (!isTouch)  {  // 正在刷新,且没有往上推的话则悬停,显示"正在刷新..."  if (state == REFRESHING && pullDownY <= refreshDist)  {   pullDownY = refreshDist;   timer.cancel();  } else if (state == LOADING && -pullUpY <= loadmoreDist)  {   pullUpY = -loadmoreDist;   timer.cancel();  }   }  if (pullDownY > 0)  pullDownY -= MOVE_SPEED;  else if (pullUpY < 0)  pullUpY += MOVE_SPEED;  if (pullDownY < 0)  {  // 已完成回弹  pullDownY = 0;  pullView.clearAnimation();  // 隐藏下拉头时有可能还在刷新,只有当前状态不是正在刷新时才改变状态  if (state != REFRESHING && state != LOADING)   changeState(INIT);  timer.cancel();  }  if (pullUpY > 0)  {  // 已完成回弹  pullUpY = 0;  pullUpView.clearAnimation();  // 隐藏下拉头时有可能还在刷新,只有当前状态不是正在刷新时才改变状态  if (state != REFRESHING && state != LOADING)   changeState(INIT);  timer.cancel();  }  // 刷新布局,会自动调用onLayout  requestLayout();  }   };   public void setOnRefreshListener(OnRefreshListener listener)  {  mListener = listener;  }   public PullToRefreshLayout(Context context)  {  super(context);  initView(context);  }   public PullToRefreshLayout(Context context, AttributeSet attrs)  {  super(context, attrs);  initView(context);  }   public PullToRefreshLayout(Context context, AttributeSet attrs, int defStyle)  {  super(context, attrs, defStyle);  initView(context);  }   private void initView(Context context)  {  timer = new MyTimer(updateHandler);  rotateAnimation = (RotateAnimation) AnimationUtils.loadAnimation(  context, R.anim.reverse_anim);  refreshingAnimation = (RotateAnimation) AnimationUtils.loadAnimation(  context, R.anim.rotating);  // 添加匀速转动动画  LinearInterpolator lir = new LinearInterpolator();  rotateAnimation.setInterpolator(lir);  refreshingAnimation.setInterpolator(lir);  }   private void hide()  {  timer.schedule(5);  }   /**  * 完成刷新操作,显示刷新结果。注意:刷新完成后一定要调用这个方法  */  /**  * @param refreshResult  * PullToRefreshLayout.SUCCEED代表成功,PullToRefreshLayout.FAIL代表失败  */  public void refreshFinish(int refreshResult)  {  refreshingView.clearAnimation();  refreshingView.setVisibility(View.GONE);  switch (refreshResult)  {  case SUCCEED:  // 刷新成功  refreshStateImageView.setVisibility(View.VISIBLE);  refreshStateTextView.setText(R.string.refresh_succeed);  refreshStateImageView   .setBackgroundResource(R.drawable.refresh_succeed);  break;  case FAIL:  default:  // 刷新失败  refreshStateImageView.setVisibility(View.VISIBLE);  refreshStateTextView.setText(R.string.refresh_fail);  refreshStateImageView   .setBackgroundResource(R.drawable.refresh_failed);  break;  }  // 刷新结果停留1秒  new Handler()  {  @Override  public void handleMessage(Message msg)  {  changeState(DONE);  hide();  }  }.sendEmptyMessageDelayed(0, 1000);  }   /**  * 加载完毕,显示加载结果。注意:加载完成后一定要调用这个方法  *  * @param refreshResult  * PullToRefreshLayout.SUCCEED代表成功,PullToRefreshLayout.FAIL代表失败  */  public void loadmoreFinish(int refreshResult)  {  loadingView.clearAnimation();  loadingView.setVisibility(View.GONE);  switch (refreshResult)  {  case SUCCEED:  // 加载成功  loadStateImageView.setVisibility(View.VISIBLE);  loadStateTextView.setText(R.string.load_succeed);  loadStateImageView.setBackgroundResource(R.drawable.load_succeed);  break;  case FAIL:  default:  // 加载失败  loadStateImageView.setVisibility(View.VISIBLE);  loadStateTextView.setText(R.string.load_fail);  loadStateImageView.setBackgroundResource(R.drawable.load_failed);  break;  }  // 刷新结果停留1秒  new Handler()  {  @Override  public void handleMessage(Message msg)  {  changeState(DONE);  hide();  }  }.sendEmptyMessageDelayed(0, 1000);  }   private void changeState(int to)  {  state = to;  switch (state)  {  case INIT:  // 下拉布局初始状态  refreshStateImageView.setVisibility(View.GONE);  refreshStateTextView.setText(R.string.pull_to_refresh);  pullView.clearAnimation();  pullView.setVisibility(View.VISIBLE);  // 上拉布局初始状态  loadStateImageView.setVisibility(View.GONE);  loadStateTextView.setText(R.string.pullup_to_load);  pullUpView.clearAnimation();  pullUpView.setVisibility(View.VISIBLE);  break;  case RELEASE_TO_REFRESH:  // 释放刷新状态  refreshStateTextView.setText(R.string.release_to_refresh);  pullView.startAnimation(rotateAnimation);  break;  case REFRESHING:  // 正在刷新状态  pullView.clearAnimation();  refreshingView.setVisibility(View.VISIBLE);  pullView.setVisibility(View.INVISIBLE);  refreshingView.startAnimation(refreshingAnimation);  refreshStateTextView.setText(R.string.refreshing);  break;  case RELEASE_TO_LOAD:  // 释放加载状态  loadStateTextView.setText(R.string.release_to_load);  pullUpView.startAnimation(rotateAnimation);  break;  case LOADING:  // 正在加载状态  pullUpView.clearAnimation();  loadingView.setVisibility(View.VISIBLE);  pullUpView.setVisibility(View.INVISIBLE);  loadingView.startAnimation(refreshingAnimation);  loadStateTextView.setText(R.string.loading);  break;  case DONE:  // 刷新或加载完毕,啥都不做  break;  }  }   /**  * 不限制上拉或下拉  */  private void releasePull()  {  canPullDown = true;  canPullUp = true;  }   /*  * (非 Javadoc)由父控件决定是否分发事件,防止事件冲突  *  * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent)  */  @Override  public boolean dispatchTouchEvent(MotionEvent ev)  {  switch (ev.getActionMasked())  {  case MotionEvent.ACTION_DOWN:  downY = ev.getY();  lastY = downY;  timer.cancel();  mEvents = 0;  releasePull();  break;  case MotionEvent.ACTION_POINTER_DOWN:  case MotionEvent.ACTION_POINTER_UP:  // 过滤多点触碰  mEvents = -1;  break;  case MotionEvent.ACTION_MOVE:  if (mEvents == 0)  {  if (((Pullable) pullableView).canPullDown() && canPullDown   && state != LOADING)  {   // 可以下拉,正在加载时不能下拉   // 对实际滑动距离做缩小,造成用力拉的感觉   pullDownY = pullDownY + (ev.getY() - lastY) / radio;   if (pullDownY < 0)   {   pullDownY = 0;   canPullDown = false;   canPullUp = true;   }   if (pullDownY > getMeasuredHeight())   pullDownY = getMeasuredHeight();   if (state == REFRESHING)   {   // 正在刷新的时候触摸移动   isTouch = true;   }  } else if (((Pullable) pullableView).canPullUp() && canPullUp   && state != REFRESHING)  {   // 可以上拉,正在刷新时不能上拉   pullUpY = pullUpY + (ev.getY() - lastY) / radio;   if (pullUpY > 0)   {   pullUpY = 0;   canPullDown = true;   canPullUp = false;   }   if (pullUpY < -getMeasuredHeight())   pullUpY = -getMeasuredHeight();   if (state == LOADING)   {   // 正在加载的时候触摸移动   isTouch = true;   }  } else   releasePull();  } else  mEvents = 0;  lastY = ev.getY();  // 根据下拉距离改变比例  radio = (float) (2 + 2 * Math.tan(Math.PI / 2 / getMeasuredHeight()   * (pullDownY + Math.abs(pullUpY))));  requestLayout();  if (pullDownY <= refreshDist <span style="white-space:pre">  </span>&& (state == RELEASE_TO_REFRESH || state == DONE)) { <span style="white-space:pre"> </span>// 如果下拉距离没达到刷新的距离且当前状态是释放刷新,改变状态为下拉刷新 <span style="white-space:pre"> </span>changeState(INIT); <span style="white-space:pre"> </span>} <span style="white-space:pre"> </span>if (pullDownY >= refreshDist && (state == INIT || state == DONE)) { <span style="white-space:pre"> </span>// 如果下拉距离达到刷新的距离且当前状态是初始状态刷新,改变状态为释放刷新 <span style="white-space:pre"> </span>changeState(RELEASE_TO_REFRESH); <span style="white-space:pre"> </span>} <span style="white-space:pre"> </span>// 下面是判断上拉加载的,同上,注意pullUpY是负值 <span style="white-space:pre"> </span>if (-pullUpY <= loadmoreDist <span style="white-space:pre">  </span>&& (state == RELEASE_TO_LOAD || state == DONE)) { <span style="white-space:pre"> </span>changeState(INIT); <span style="white-space:pre"> </span>} <span style="white-space:pre"> </span>if (-pullUpY >= loadmoreDist && (state == INIT || state == DONE)) { <span style="white-space:pre"> </span>changeState(RELEASE_TO_LOAD); <span style="white-space:pre"> </span>}  // 因为刷新和加载操作不能同时进行,所以pullDownY和pullUpY不会同时不为0,因此这里用(pullDownY +  // Math.abs(pullUpY))就可以不对当前状态作区分了  if ((pullDownY + Math.abs(pullUpY)) > 8)  {  // 防止下拉过程中误触发长按事件和点击事件  ev.setAction(MotionEvent.ACTION_CANCEL);  }  break;  case MotionEvent.ACTION_UP:  if (pullDownY > refreshDist || -pullUpY > loadmoreDist)  // 正在刷新时往下拉(正在加载时往上拉),释放后下拉头(上拉头)不隐藏  isTouch = false;  if (state == RELEASE_TO_REFRESH)  {  changeState(REFRESHING);  // 刷新操作  if (mListener != null)   mListener.onRefresh(this);  } else if (state == RELEASE_TO_LOAD)  {  changeState(LOADING);  // 加载操作  if (mListener != null)   mListener.onLoadMore(this);  }  hide();  default:  break;  }  // 事件分发交给父类  super.dispatchTouchEvent(ev);  return true;  }   private void initView()  {  // 初始化下拉布局  pullView = refreshView.findViewById(R.id.pull_icon);  refreshStateTextView = (TextView) refreshView  .findViewById(R.id.state_tv);  refreshingView = refreshView.findViewById(R.id.refreshing_icon);  refreshStateImageView = refreshView.findViewById(R.id.state_iv);  // 初始化上拉布局  pullUpView = loadmoreView.findViewById(R.id.pullup_icon);  loadStateTextView = (TextView) loadmoreView  .findViewById(R.id.loadstate_tv);  loadingView = loadmoreView.findViewById(R.id.loading_icon);  loadStateImageView = loadmoreView.findViewById(R.id.loadstate_iv);  }   @Override  protected void onLayout(boolean changed, int l, int t, int r, int b)  {  if (!isLayout)  {  // 这里是第一次进来的时候做一些初始化  refreshView = getChildAt(0);  pullableView = getChildAt(1);  loadmoreView = getChildAt(2);  isLayout = true;  initView();  refreshDist = ((ViewGroup) refreshView).getChildAt(0)   .getMeasuredHeight();  loadmoreDist = ((ViewGroup) loadmoreView).getChildAt(0)   .getMeasuredHeight();  }  // 改变子控件的布局,这里直接用(pullDownY + pullUpY)作为偏移量,这样就可以不对当前状态作区分  refreshView.layout(0,  (int) (pullDownY + pullUpY) - refreshView.getMeasuredHeight(),  refreshView.getMeasuredWidth(), (int) (pullDownY + pullUpY));  pullableView.layout(0, (int) (pullDownY + pullUpY),  pullableView.getMeasuredWidth(), (int) (pullDownY + pullUpY)   + pullableView.getMeasuredHeight());  loadmoreView.layout(0,  (int) (pullDownY + pullUpY) + pullableView.getMeasuredHeight(),  loadmoreView.getMeasuredWidth(),  (int) (pullDownY + pullUpY) + pullableView.getMeasuredHeight()   + loadmoreView.getMeasuredHeight());  }   class MyTimer  {  private Handler handler;  private Timer timer;  private MyTask mTask;   public MyTimer(Handler handler)  {  this.handler = handler;  timer = new Timer();  }   public void schedule(long period)  {  if (mTask != null)  {  mTask.cancel();  mTask = null;  }  mTask = new MyTask(handler);  timer.schedule(mTask, 0, period);  }   public void cancel()  {  if (mTask != null)  {  mTask.cancel();  mTask = null;  }  }   class MyTask extends TimerTask  {  private Handler handler;   public MyTask(Handler handler)  {  this.handler = handler;  }   @Override  public void run()  {  handler.obtainMessage().sendToTarget();  }   }  }   /**  * 刷新加载回调接口  *  * @author chenjing  *  */  public interface OnRefreshListener  {  /**  * 刷新操作  */  void onRefresh(PullToRefreshLayout pullToRefreshLayout);   /**  * 加载操作  */  void onLoadMore(PullToRefreshLayout pullToRefreshLayout);  }  } 

上面就是整个布局的代码,并不是很难。
下面看各个View对Pullable接口的实现,ListView和GridView还有ExpandableListView的判断方法是一样的:
PullableListView:

package com.jingchen.pulltorefresh.pullableview;  import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.widget.ListView;  public class PullableListView extends ListView implements Pullable {   public PullableListView(Context context)  {  super(context);  }   public PullableListView(Context context, AttributeSet attrs)  {  super(context, attrs);  }   public PullableListView(Context context, AttributeSet attrs, int defStyle)  {  super(context, attrs, defStyle);  }   @Override  public boolean canPullDown()  {  if (getCount() == 0)  {  // 没有item的时候也可以下拉刷新  return true;  } else if (getFirstVisiblePosition() == 0  && getChildAt(0).getTop() >= 0)  {  // 滑到ListView的顶部了  return true;  } else  return false;  }   @Override  public boolean canPullUp()  {  if (getCount() == 0)  {  // 没有item的时候也可以上拉加载  return true;  } else if (getLastVisiblePosition() == (getCount() - 1))  {  // 滑到底部了  if (getChildAt(getLastVisiblePosition() - getFirstVisiblePosition()) != null   && getChildAt(   getLastVisiblePosition()    - getFirstVisiblePosition()).getBottom() <= getMeasuredHeight())  return true;  }  return false;  } }

 

PullableExpandableListView:

package com.jingchen.pulltorefresh.pullableview;  import android.content.Context; import android.util.AttributeSet; import android.widget.ExpandableListView;  public class PullableExpandableListView extends ExpandableListView implements  Pullable {   public PullableExpandableListView(Context context)  {  super(context);  }   public PullableExpandableListView(Context context, AttributeSet attrs)  {  super(context, attrs);  }   public PullableExpandableListView(Context context, AttributeSet attrs,  int defStyle)  {  super(context, attrs, defStyle);  }   @Override  public boolean canPullDown()  {  if (getCount() == 0)  {  // 没有item的时候也可以下拉刷新  return true;  } else if (getFirstVisiblePosition() == 0  && getChildAt(0).getTop() >= 0)  {  // 滑到顶部了  return true;  } else  return false;  }   @Override  public boolean canPullUp()  {  if (getCount() == 0)  {  // 没有item的时候也可以上拉加载  return true;  } else if (getLastVisiblePosition() == (getCount() - 1))  {  // 滑到底部了  if (getChildAt(getLastVisiblePosition() - getFirstVisiblePosition()) != null   && getChildAt(   getLastVisiblePosition()    - getFirstVisiblePosition()).getBottom() <= getMeasuredHeight())  return true;  }  return false;  }  } 

PullableGridView:

package com.jingchen.pulltorefresh.pullableview;  import android.content.Context; import android.util.AttributeSet; import android.widget.GridView;  public class PullableGridView extends GridView implements Pullable {   public PullableGridView(Context context)  {  super(context);  }   public PullableGridView(Context context, AttributeSet attrs)  {  super(context, attrs);  }   public PullableGridView(Context context, AttributeSet attrs, int defStyle)  {  super(context, attrs, defStyle);  }   @Override  public boolean canPullDown()  {  if (getCount() == 0)  {  // 没有item的时候也可以下拉刷新  return true;  } else if (getFirstVisiblePosition() == 0  && getChildAt(0).getTop() >= 0)  {  // 滑到顶部了  return true;  } else  return false;  }   @Override  public boolean canPullUp()  {  if (getCount() == 0)  {  // 没有item的时候也可以上拉加载  return true;  } else if (getLastVisiblePosition() == (getCount() - 1))  {  // 滑到底部了  if (getChildAt(getLastVisiblePosition() - getFirstVisiblePosition()) != null   && getChildAt(   getLastVisiblePosition()    - getFirstVisiblePosition()).getBottom() <= getMeasuredHeight())  return true;  }  return false;  }  } 

PullableScrollView:

package com.jingchen.pulltorefresh.pullableview;  import android.content.Context; import android.util.AttributeSet; import android.widget.ScrollView;  public class PullableScrollView extends ScrollView implements Pullable {   public PullableScrollView(Context context)  {  super(context);  }   public PullableScrollView(Context context, AttributeSet attrs)  {  super(context, attrs);  }   public PullableScrollView(Context context, AttributeSet attrs, int defStyle)  {  super(context, attrs, defStyle);  }   @Override  public boolean canPullDown()  {  if (getScrollY() == 0)  return true;  else  return false;  }   @Override  public boolean canPullUp()  {  if (getScrollY() >= (getChildAt(0).getHeight() - getMeasuredHeight()))  return true;  else  return false;  }  } 

PullableWebView:

package com.jingchen.pulltorefresh.pullableview;  import android.content.Context; import android.util.AttributeSet; import android.webkit.WebView;  public class PullableWebView extends WebView implements Pullable {   public PullableWebView(Context context)  {  super(context);  }   public PullableWebView(Context context, AttributeSet attrs)  {  super(context, attrs);  }   public PullableWebView(Context context, AttributeSet attrs, int defStyle)  {  super(context, attrs, defStyle);  }   @Override  public boolean canPullDown()  {  if (getScrollY() == 0)  return true;  else  return false;  }   @Override  public boolean canPullUp()  {  if (getScrollY() >= getContentHeight() * getScale()  - getMeasuredHeight())  return true;  else  return false;  } } 

ImageView和TextView就不贴了,我直接在方法里返回了true。
源码下载:通用版下拉刷新上拉加载大合集demo 

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