package com.jingchen.pulltorefresh;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.RelativeLayout;
import android.widget.TextView;
import java.lang.ref.WeakReference;
import java.util.Timer;
import java.util.TimerTask;
import pl.droidsonroids.gif.GifDrawable;
/**
* 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，更多详解见博客http://blog.csdn.net/zhongkejingwang/article/details/38868463
*
* @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 OnPullListener 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 mMoveSpeed = 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 reverseUpAnimation;
private RotateAnimation reverseDownAnimation;
// 均匀旋转动画
private RotateAnimation refreshingAnimation;
// 默认下拉头
private View defaultRefreshView;
// 下拉的箭头
private View pullDownView;
// 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;
// 默认上拉头
private View defaultLoadmoreView;
// // 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 mCanPullDown = true;
private boolean mCanPullUp = true;
private boolean mPullDownEnable = true;
private boolean mPullUpEnable = true;
// 执行自动回滚的handler
private Handler updateHandler;
// 自定义下拉头
private View customRefreshView;
// 自定义上拉头
private View customLoadmoreView;
// 下拉刷新过程监听器
private OnPullProcessListener mOnRefreshProcessListener;
// 上拉加载更多过程监听器
private OnPullProcessListener mOnLoadmoreProcessListener;
// 下拉头
private View refreshView;
// 上拉头
private View loadmoreView;
// 是否已经准备下拉
private boolean mPreparedPullDown;
// 是否已经准备上拉
private boolean mPreparedPullUp;
public PullToRefreshLayout(Context context)
{
this(context, null, 0);
}
public PullToRefreshLayout(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public PullToRefreshLayout(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
initView(context, attrs, defStyle);
}
private void initView(Context context, AttributeSet attrs, int defStyle)
{
updateHandler = new UpdateHandler(this);
timer = new MyTimer(updateHandler);
reverseUpAnimation = (RotateAnimation) AnimationUtils.loadAnimation(
context, R.anim.reverse_up_anim);
reverseDownAnimation = (RotateAnimation) AnimationUtils.loadAnimation(
context, R.anim.reverse_down_anim);
refreshingAnimation = (RotateAnimation) AnimationUtils.loadAnimation(
context, R.anim.rotating_anim);
// 添加匀速转动动画
LinearInterpolator lir = new LinearInterpolator();
reverseUpAnimation.setInterpolator(lir);
refreshingAnimation.setInterpolator(lir);
// 添加上拉头和下拉头
LayoutInflater inflater = LayoutInflater.from(context);
defaultRefreshView = inflater.inflate(R.layout.refresh_head, this,
false);
refreshView = defaultRefreshView;
defaultLoadmoreView = inflater.inflate(R.layout.load_more, this, false);
loadmoreView = defaultLoadmoreView;
addView(defaultRefreshView);
addView(defaultLoadmoreView);
}
/**
* 获取可拉取的视图
*
* @return
*/
public View getPullableView()
{
for (int i = 0; i < getChildCount(); i++)
{
View v = getChildAt(i);
if (v instanceof Pullable)
{
pullableView = v;
return pullableView;
}
}
return pullableView;
}
/**
* 设置自定义下拉头
*
* @param v
*/
public void setCustomRefreshView(View v)
{
customRefreshView = v;
removeView(defaultRefreshView);
addView(customRefreshView);
refreshView = customRefreshView;
}
/**
* 设置自定义上拉头
*
* @param v
*/
public void setCustomLoadmoreView(View v)
{
customLoadmoreView = v;
removeView(defaultLoadmoreView);
addView(customLoadmoreView);
loadmoreView = customLoadmoreView;
}
/**
* 设置下拉刷新gif动画头
*
* @param headGifDrawable
*/
public void setGifRefreshView(GifDrawable headGifDrawable)
{
// 设置下拉头
GifHeadView headView = new GifHeadView(getContext());
headView.setGifAnim(headGifDrawable);
setCustomRefreshView(headView);
setOnRefreshProcessListener(new GifOnPullProcessListener(
headView.getDrawable()));
}
/**
* 设置上拉加载更多gif动画头
*
* @param footGifDrawable
*/
public void setGifLoadmoreView(GifDrawable footGifDrawable)
{
// 设置上拉头
GifHeadView footView = new GifHeadView(getContext());
footView.setGifAnim(footGifDrawable);
setCustomLoadmoreView(footView);
setOnLoadmoreProcessListener(new GifOnPullProcessListener(
footView.getDrawable()));
}
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(final int refreshResult)
{
new Handler().postDelayed(new Runnable()
{
@Override
public void run()
{
if (null != mOnRefreshProcessListener)
{
mOnRefreshProcessListener.onFinish(refreshView,
OnPullProcessListener.REFRESH);
}
if (null == customRefreshView)
{
refreshingView.clearAnimation();
refreshingView.setVisibility(View.GONE);
}
switch (refreshResult)
{
case SUCCEED:
// 刷新成功
if (null == customRefreshView)
{
refreshStateImageView.setVisibility(View.VISIBLE);
refreshStateTextView.setText(R.string.refresh_succeed);
refreshStateImageView
.setBackgroundResource(R.drawable.refresh_succeed);
}
break;
case FAIL:
default:
// 刷新失败
if (null == customRefreshView)
{
refreshStateImageView.setVisibility(View.VISIBLE);
refreshStateTextView.setText(R.string.refresh_fail);
refreshStateImageView
.setBackgroundResource(R.drawable.refresh_failed);
}
break;
}
if (pullDownY > 0)
{
// 刷新结果停留1秒
new RemainHandler(PullToRefreshLayout.this).sendEmptyMessageDelayed(0, 1000);
} else
{
changeState(DONE);
hide();
}
}
}, 2400);
}
/**
* 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)
{
if (null != mOnLoadmoreProcessListener)
{
mOnLoadmoreProcessListener.onFinish(loadmoreView,
OnPullProcessListener.LOADMORE);
}
if (null == customLoadmoreView)
{
loadingView.clearAnimation();
loadingView.setVisibility(View.GONE);
}
switch (refreshResult)
{
case SUCCEED:
// 加载成功
if (null == customLoadmoreView)
{
loadStateImageView.setVisibility(View.VISIBLE);
loadStateTextView.setText(R.string.load_succeed);
loadStateImageView
.setBackgroundResource(R.drawable.load_succeed);
}
break;
case FAIL:
default:
// 加载失败
if (null == customLoadmoreView)
{
loadStateImageView.setVisibility(View.VISIBLE);
loadStateTextView.setText(R.string.load_fail);
loadStateImageView
.setBackgroundResource(R.drawable.load_failed);
}
break;
}
if (pullUpY < 0)
{
// 刷新结果停留1秒
new RemainHandler(this).sendEmptyMessageDelayed(0, 1000);
} else
{
changeState(DONE);
hide();
}
}
private void changeState(int to)
{
state = to;
switch (state)
{
case INIT:
mPreparedPullDown = false;
mPreparedPullUp = false;
// 下拉布局初始状态
if (null == customRefreshView)
{
pullDownView.startAnimation(reverseDownAnimation);
refreshStateImageView.setVisibility(View.GONE);
refreshStateTextView.setText(R.string.pull_to_refresh);
pullDownView.setVisibility(View.VISIBLE);
}
// 上拉布局初始状态
if (null == customLoadmoreView)
{
pullUpView.startAnimation(reverseDownAnimation);
loadStateImageView.setVisibility(View.GONE);
loadStateTextView.setText(R.string.pullup_to_load);
pullUpView.setVisibility(View.VISIBLE);
}
break;
case RELEASE_TO_REFRESH:
if (null != mOnRefreshProcessListener)
{
mOnRefreshProcessListener.onStart(refreshView,
OnPullProcessListener.REFRESH);
}
// 释放刷新状态
if (null == customRefreshView)
{
refreshStateTextView.setText(R.string.release_to_refresh);
pullDownView.startAnimation(reverseUpAnimation);
}
break;
case REFRESHING:
if (null != mOnRefreshProcessListener)
{
mOnRefreshProcessListener.onHandling(refreshView,
OnPullProcessListener.REFRESH);
}
// 正在刷新状态
if (null == customRefreshView)
{
pullDownView.clearAnimation();
refreshingView.setVisibility(View.VISIBLE);
pullDownView.setVisibility(View.INVISIBLE);
refreshingView.startAnimation(refreshingAnimation);
refreshStateTextView.setText(R.string.refreshing);
}
break;
case RELEASE_TO_LOAD:
if (null != mOnLoadmoreProcessListener)
{
mOnLoadmoreProcessListener.onStart(loadmoreView,
OnPullProcessListener.LOADMORE);
}
// 释放加载状态
if (null == customLoadmoreView)
{
loadStateTextView.setText(R.string.release_to_load);
pullUpView.startAnimation(reverseUpAnimation);
}
break;
case LOADING:
// 正在加载状态
if (null != mOnLoadmoreProcessListener)
{
mOnLoadmoreProcessListener.onHandling(loadmoreView,
OnPullProcessListener.LOADMORE);
}
if (null == customLoadmoreView)
{
pullUpView.clearAnimation();
loadingView.setVisibility(View.VISIBLE);
pullUpView.setVisibility(View.INVISIBLE);
loadingView.startAnimation(refreshingAnimation);
loadStateTextView.setText(R.string.loading);
} else
{
customLoadmoreView.setVisibility(View.VISIBLE);
}
break;
case DONE:
refreshView.setVisibility(View.VISIBLE);
loadmoreView.setVisibility(View.VISIBLE);
break;
}
}
/**
* 不限制上拉或下拉
*/
private void releasePull()
{
mCanPullDown = true;
mCanPullUp = true;
}
/**
* 设置是否可下拉刷新
*
* @param pullDownEnable
*/
public void setPullDownEnable(boolean pullDownEnable)
{
mPullDownEnable = pullDownEnable;
}
/**
* 设置是否可上拉刷新
*/
public void setPullUpEnable(boolean pullUpEnable)
{
mPullUpEnable = pullUpEnable;
}
/*
* （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 (null != mOnRefreshProcessListener && pullDownY > 0)
{
if (!mPreparedPullDown)
{
mPreparedPullDown = true;
if (null != mOnRefreshProcessListener)
{
mOnRefreshProcessListener.onPrepare(refreshView,
OnPullProcessListener.REFRESH);
}
}
mOnRefreshProcessListener.onPull(refreshView, pullDownY,
OnPullProcessListener.REFRESH);
}
if (null != mOnLoadmoreProcessListener && pullUpY < 0)
{
if (!mPreparedPullUp)
{
mPreparedPullUp = true;
if (null != mOnLoadmoreProcessListener)
{
mOnLoadmoreProcessListener.onPrepare(loadmoreView,
OnPullProcessListener.LOADMORE);
}
}
mOnLoadmoreProcessListener.onPull(loadmoreView, pullUpY,
OnPullProcessListener.LOADMORE);
}
if (mEvents == 0)
{
if (pullDownY > 0
|| (((Pullable) pullableView).canPullDown()
&& mCanPullDown && mPullDownEnable && 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;
mCanPullDown = false;
mCanPullUp = true;
}
if (pullDownY > getMeasuredHeight())
pullDownY = getMeasuredHeight();
if (state == REFRESHING)
{
// 正在刷新的时候触摸移动
isTouch = true;
}
} else if (pullUpY < 0
|| (((Pullable) pullableView).canPullUp() && mCanPullUp
&& mPullUpEnable && 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;
mCanPullDown = true;
mCanPullUp = 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))));
if (pullDownY > 0 || pullUpY < 0)
requestLayout();
if (pullDownY > 0)
{
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)
{
// 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);
}
} else if (pullUpY < 0)
{
// 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);
}
// 上拉操作
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;
}
/**
* @author chenjing 自动模拟手指滑动的task
*/
private class AutoRefreshAndLoadTask extends
AsyncTask<Integer, Float, String>
{
@Override
protected String doInBackground(Integer... params)
{
while (pullDownY < 4 / 3 * refreshDist)
{
pullDownY += mMoveSpeed;
publishProgress(pullDownY);
try
{
Thread.sleep(params[0]);
} catch (InterruptedException e)
{
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(String result)
{
changeState(REFRESHING);
// 刷新操作
if (mListener != null)
mListener.onRefresh(PullToRefreshLayout.this);
if (null != mOnRefreshProcessListener)
{
mOnRefreshProcessListener.onStart(refreshView,
OnPullProcessListener.REFRESH);
}
hide();
}
@Override
protected void onProgressUpdate(Float... values)
{
if (pullDownY > refreshDist)
changeState(RELEASE_TO_REFRESH);
requestLayout();
}
}
/**
* 自动刷新
*/
public void autoRefresh()
{
loadmoreView.setVisibility(View.GONE);
AutoRefreshAndLoadTask task = new AutoRefreshAndLoadTask();
task.execute(2);
}
/**
* 自动加载
*/
public void autoLoad()
{
refreshView.setVisibility(View.GONE);
pullUpY = -loadmoreDist;
requestLayout();
changeState(LOADING);
// 加载操作
if (mListener != null)
mListener.onLoadMore(this);
}
private void initView()
{
// 初始化下拉布局
if (null == customRefreshView)
{
pullDownView = defaultRefreshView.findViewById(R.id.pull_icon);
refreshStateTextView = (TextView) defaultRefreshView
.findViewById(R.id.state_tv);
refreshingView = defaultRefreshView
.findViewById(R.id.refreshing_icon);
refreshStateImageView = defaultRefreshView
.findViewById(R.id.state_iv);
}
// 初始化上拉布局
if (null == customLoadmoreView)
{
pullUpView = defaultLoadmoreView.findViewById(R.id.pullup_icon);
loadStateTextView = (TextView) defaultLoadmoreView
.findViewById(R.id.loadstate_tv);
loadingView = defaultLoadmoreView.findViewById(R.id.loading_icon);
loadStateImageView = defaultLoadmoreView
.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
getPullableView();
isLayout = true;
initView();
refreshView.measure(0, 0);
refreshDist = refreshView.getMeasuredHeight();
loadmoreView.measure(0, 0);
loadmoreDist = loadmoreView.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();
}
}
}
/**
* 刷新结果停留的handler
*/
static class RemainHandler extends Handler
{
private WeakReference<PullToRefreshLayout> mLayout;
public RemainHandler(PullToRefreshLayout layout)
{
mLayout = new WeakReference<>(layout);
}
@Override
public void handleMessage(Message msg)
{
PullToRefreshLayout layout = mLayout.get();
if (null != layout)
{
layout.changeState(DONE);
layout.hide();
}
}
}
/**
* 执行自动回滚的handler
*/
static class UpdateHandler extends Handler
{
private WeakReference<PullToRefreshLayout> mLayout;
public UpdateHandler(PullToRefreshLayout layout)
{
mLayout = new WeakReference<>(layout);
}
@Override
public void handleMessage(Message msg)
{
PullToRefreshLayout layout = mLayout.get();
if (null != layout)
{
// 回弹速度随下拉距离moveDeltaY增大而增大
layout.mMoveSpeed = (float) (8 + 5 * Math.tan(Math.PI / 2
/ layout.getMeasuredHeight()
* (layout.pullDownY + Math.abs(layout.pullUpY))));
if (!layout.isTouch)
{
// 正在刷新，且没有往上推的话则悬停，显示"正在刷新..."
if (layout.state == REFRESHING
&& layout.pullDownY <= layout.refreshDist)
{
layout.pullDownY = layout.refreshDist;
layout.timer.cancel();
} else if (layout.state == LOADING
&& -layout.pullUpY <= layout.loadmoreDist)
{
layout.pullUpY = -layout.loadmoreDist;
layout.timer.cancel();
}
}
if (layout.pullDownY > 0)
layout.pullDownY -= layout.mMoveSpeed;
else if (layout.pullUpY < 0)
layout.pullUpY += layout.mMoveSpeed;
if (layout.pullDownY < 0)
{
// 已完成回弹
layout.pullDownY = 0;
if (null == layout.customRefreshView)
{
layout.pullDownView.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 (layout.state != REFRESHING && layout.state != LOADING)
layout.changeState(INIT);
layout.timer.cancel();
layout.requestLayout();
}
if (layout.pullUpY > 0)
{
// 已完成回弹
layout.pullUpY = 0;
if (null == layout.customLoadmoreView)
{
layout.pullUpView.clearAnimation();
}
// 隐藏上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 (layout.state != REFRESHING && layout.state != LOADING)
layout.changeState(INIT);
layout.timer.cancel();
layout.requestLayout();
}
// 刷新布局,会自动调用onLayout
layout.requestLayout();
// 没有拖拉或者回弹完成
if (layout.pullDownY + Math.abs(layout.pullUpY) == 0)
layout.timer.cancel();
}
}
}
;
public void setOnPullListener(OnPullListener listener)
{
mListener = listener;
}
/**
* 设置下拉刷新过程监听器
*
* @param onPullProcessListener
*/
public void setOnRefreshProcessListener(
OnPullProcessListener onPullProcessListener)
{
mOnRefreshProcessListener = onPullProcessListener;
}
/**
* 设置上拉加载更多过程监听器
*
* @param onPullProcessListener
*/
public void setOnLoadmoreProcessListener(
OnPullProcessListener onPullProcessListener)
{
mOnLoadmoreProcessListener = onPullProcessListener;
}
/**
* 刷新加载回调接口
*
* @author chenjing
*/
public interface OnPullListener
{
/**
* 刷新操作
*/
void onRefresh(PullToRefreshLayout pullToRefreshLayout);
/**
* 加载操作
*/
void onLoadMore(PullToRefreshLayout pullToRefreshLayout);
}
/**
* 下拉刷新或上拉加载更多过程监听器
*
* @author LynnChurch
*/
public interface OnPullProcessListener
{
int REFRESH = 1; // 刷新
int LOADMORE = 2; // 加载更多
/**
* 准备 （提示下拉刷新或上拉加载更多）
*
* @param v
* @param which 刷新或加载更多
*/
void onPrepare(View v, int which);
/**
* 开始 （提示释放刷新或释放加载更多）
*
* @param v
* @param which 刷新或加载更多
*/
void onStart(View v, int which);
/**
* 处理中
*
* @param v
* @param which 刷新或加载更多
*/
void onHandling(View v, int which);
/**
* 完成
*
* @param v
* @param which 刷新或加载更多
*/
void onFinish(View v, int which);
/**
* 用于获取拉取的距离
*
* @param v
* @param pullDistance
* @param which 刷新或加载更多
*/
void onPull(View v, float pullDistance, int which);
}
/**
* 用于gif动画的控制
*
* @author LynnChurch
*/
public class GifOnPullProcessListener implements OnPullProcessListener
{
private GifDrawable mGifDrawable;
private int lastFramePosition; // 上一帧的位置
public GifOnPullProcessListener(GifDrawable gifDrawable)
{
mGifDrawable = gifDrawable;
}
@Override
public void onPrepare(View v, int which)
{
// TODO Auto-generated method stub
mGifDrawable.stop();
}
@Override
public void onStart(View v, int which)
{
// TODO Auto-generated method stub
}
@Override
public void onHandling(View v, int which)
{
// TODO Auto-generated method stub
mGifDrawable.start();
}
@Override
public void onFinish(View v, int which)
{
// TODO Auto-generated method stub
mGifDrawable.stop();
}
@Override
public void onPull(View v, float pullDistance, int which)
{
// TODO Auto-generated method stub
// 动画总帧数
int frames = mGifDrawable.getNumberOfFrames();
RelativeLayout headView = (RelativeLayout) v
.findViewById(R.id.head_view);
int headViewHeight = headView.getHeight();
// 算出下拉过程中对应的动画进度
float progress = Math.abs(pullDistance % headViewHeight
/ headViewHeight);
// 当前播放帧
int currentFrame = (int) (frames * progress) + 1;
// 当前帧与上一帧不同时才进行播放，保证流畅度
if (lastFramePosition != currentFrame)
{
// 需要进行动画重置，否则不能够自由地定位到每一帧
mGifDrawable.reset();
mGifDrawable.seekToFrame(currentFrame);
lastFramePosition = currentFrame;
}
}
}
}
