Android下拉刷新上拉加载控件(适用于所有View)
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*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:
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希望本文所述对大家学习android下拉刷新上拉加载控件有所帮助。
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