所有控件实现下拉刷新上拉加载功能
来源:互联网 发布:m1136mfp扫描软件 编辑:程序博客网 时间:2024/06/13 13:00
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。
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();
}
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 small
*/
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)
{
// 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)
{
// 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)
{
changeState(INIT);
}
if
(-pullUpY >= loadmoreDist && state == INIT)
{
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);
}
}
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。
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