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来源:互联网 发布:开淘宝店铺能挣钱吗 编辑:程序博客网 时间:2024/05/16 07:23

声明出处http://blog.csdn.net/zhongkejingwang/article/details/38868463

 前面写过一篇关于下拉刷新控件的博客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。(csdn上的demo有小bug,最新代码已上传到github:https://github.com/jingchenUSTC/PullToRefreshAndLoad)依照惯例,下面将会是效果图:

这里写图片描述

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等等;

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:

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  && (state == RELEASE_TO_REFRESH || state == DONE)) {                 // 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                 changeState(INIT);  }  if (pullDownY >= refreshDist && (state == INIT || state == DONE)) {  // 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  changeState(RELEASE_TO_REFRESH);  }  // 下面是判断上拉加载的,同上,注意pullUpY是负值  if (-pullUpY <= loadmoreDist  && (state == RELEASE_TO_LOAD || state == DONE)) {  changeState(INIT);  }  if (-pullUpY >= loadmoreDist && (state == INIT || state == DONE)) {  changeState(RELEASE_TO_LOAD);  }              // 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: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:[java] view plain copypackage 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:[java] view plain copypackage 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:[java] view plain copypackage 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。
OK了,整个demo的代码有点多,就不贴了。

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