Android——终极版上拉刷新下拉加载（兼容ScrlooView、ListView、GridView以及各类布局）

1、上拉下载展示的页面可以自己定制，只需要需改头部或者底部的布局就ok了

2、可以根据需求实现下拉刷新上拉加载，也可以只实现下拉刷新，对上拉进行屏蔽。反之同理。

3、布局中不仅可包含ListView、GridView还能包含其他内容

使用方法：

1、上拉刷新：头部刷新利用PullToRefreshView，实现它的onHeaderRefresh

mPullToRefreshView.setOnHeaderRefreshListener(this);
@Override
public void onHeaderRefresh(PullToRefreshView view) {
initData();
}

2、下拉加载：当滑动到底部时使用ListView等控件的OnScrollListener方法，监听到显示最后一项时，就加载数据。如下

listview.setOnScrollListener(this);
@Override
public void onScrollStateChanged(AbsListView absListView, int scrollState) {
if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE && (lastVisibileItem + 1) == projectlv.getCount()) {
//加载数据的方法
initData();

}
}

@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
lastVisibileItem = firstVisibleItem + visibleItemCount - 1;
}

附PullToRefreshView的源码

package com.ygline.frbao.view;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.ScrollView;
import android.widget.TextView;

import com.XX.R;

public class PullToRefreshView extends LinearLayout
{
//  private static final String TAG = "PullToRefreshView";
// refresh states
private static final int PULL_TO_REFRESH = 2;

private static final int RELEASE_TO_REFRESH = 3;

private static final int REFRESHING = 4;

// pull state
private static final int PULL_UP_STATE = 0;

private static final int PULL_DOWN_STATE = 1;

/**
* last y
*/
private int mLastMotionY;

private int mLastMotionX;

/**
* lock
*/
//  private boolean mLock;

/**
* header view
*/
private View mHeaderView;

/**
* footer view
*/
private View mFooterView;

/**
* list or grid
*/
private AdapterView<?> mAdapterView;

/**
* scrollview
*/
private ScrollView mScrollView;

/**
* header view height
*/
private int mHeaderViewHeight;

/**
* footer view height
*/
private int mFooterViewHeight;

/**
* header view image
*/
private ImageView mHeaderImageView;

/**
* footer view image
*/
private ImageView mFooterImageView;

/**
* header tip text
*/
private TextView mHeaderTextView;

/**
* footer tip text
*/
private TextView mFooterTextView;

/**
* header refresh time
*/
private TextView mHeaderUpdateTextView;

/**
* footer refresh time
*/
// private TextView mFooterUpdateTextView;

/**
* header progress bar
*/
private ProgressBar mHeaderProgressBar;

/**
* footer progress bar
*/
private ProgressBar mFooterProgressBar;

/**
* layout inflater
*/
private LayoutInflater mInflater;

/**
* header view current state
*/
private int mHeaderState;

/**
* footer view current state
*/
private int mFooterState;

/**
* pull state,pull up or pull down;PULL_UP_STATE or PULL_DOWN_STATE
*/
private int mPullState;

/**
* 变为向下的箭头,改变箭头方向
*/
private RotateAnimation mFlipAnimation;

/**
* 变为逆向的箭头,旋转
*/
private RotateAnimation mReverseFlipAnimation;

/**
* footer refresh listener
*/
private OnFooterRefreshListener mOnFooterRefreshListener;

/**
* footer refresh listener
*/
private OnHeaderRefreshListener mOnHeaderRefreshListener;

/**
* last update time
*/
//  private String mLastUpdateTime;

private int position = 20;

public PullToRefreshView(Context context, AttributeSet attrs)
{
super(context, attrs);
init();
}

public PullToRefreshView(Context context)
{
super(context);
init();
}

private void init()
{
//需要设置成vertical
setOrientation(LinearLayout.VERTICAL);
// Load all of the animations we need in code rather than through XML
mFlipAnimation =
new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
mFlipAnimation.setInterpolator(new LinearInterpolator());
mFlipAnimation.setDuration(250);
mFlipAnimation.setFillAfter(true);
mReverseFlipAnimation =
new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
mReverseFlipAnimation.setInterpolator(new LinearInterpolator());
mReverseFlipAnimation.setDuration(250);
mReverseFlipAnimation.setFillAfter(true);

mInflater = LayoutInflater.from(getContext());
// header view 在此添加,保证是第一个添加到linearlayout的最上端
addHeaderView();
}

private void addHeaderView()
{
// header view
mHeaderView = mInflater.inflate(R.layout.refresh_header, this, false);

mHeaderImageView = (ImageView) mHeaderView.findViewById(R.id.pull_to_refresh_image);
mHeaderTextView = (TextView) mHeaderView.findViewById(R.id.pull_to_refresh_text);
mHeaderUpdateTextView = (TextView) mHeaderView.findViewById(R.id.pull_to_refresh_updated_at);
mHeaderProgressBar = (ProgressBar) mHeaderView.findViewById(R.id.pull_to_refresh_progress);
// header layout
measureView(mHeaderView);
mHeaderViewHeight = mHeaderView.getMeasuredHeight();
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, mHeaderViewHeight);
// 设置topMargin的值为负的header View高度,即将其隐藏在最上方
params.topMargin = -(mHeaderViewHeight);
// mHeaderView.setLayoutParams(params1);
addView(mHeaderView, params);

}

private void addFooterView()
{
// footer view
mFooterView = mInflater.inflate(R.layout.refresh_footer, this, false);
mFooterView.setVisibility(View.GONE);
mFooterImageView = (ImageView) mFooterView.findViewById(R.id.pull_to_load_image);
mFooterTextView = (TextView) mFooterView.findViewById(R.id.pull_to_load_text);
mFooterProgressBar = (ProgressBar) mFooterView.findViewById(R.id.pull_to_load_progress);
// footer layout
measureView(mFooterView);
mFooterViewHeight = mFooterView.getMeasuredHeight();
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, mFooterViewHeight);
// int top = getHeight();
// params.topMargin
// =getHeight();//在这里getHeight()==0,但在onInterceptTouchEvent()方法里getHeight()已经有值了,不再是0;
// getHeight()什么时候会赋值,稍候再研究一下
// 由于是线性布局可以直接添加,只要AdapterView的高度是MATCH_PARENT,那么footer view就会被添加到最后,并隐藏
addView(mFooterView, params);
}

@Override
protected void onFinishInflate()
{
super.onFinishInflate();
// footer view 在此添加保证添加到linearlayout中的最后
addFooterView();
initContentAdapterView();
}

/**
* init AdapterView like ListView,GridView and so on;or init ScrollView
*/
private void initContentAdapterView()
{
int count = getChildCount();
if (count < 3)
{
throw new IllegalArgumentException(
"This layout must contain 3 child views,and AdapterView or ScrollView must in the second position!");
}
View view = null;
for (int i = 0; i < count - 1; ++i)
{
view = getChildAt(i);
if (view instanceof AdapterView<?>)
{
mAdapterView = (AdapterView<?>) view;
}
if (view instanceof ScrollView)
{
// finish later
mScrollView = (ScrollView) view;
}
}
if (mAdapterView == null && mScrollView == null)
{
throw new IllegalArgumentException("must contain a AdapterView or ScrollView in this layout!");
}
}

private void measureView(View child)
{
ViewGroup.LayoutParams p = child.getLayoutParams();
if (p == null)
{
p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
}

int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
int lpHeight = p.height;
int childHeightSpec;
if (lpHeight > 0)
{
childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
} else
{
childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
}
child.measure(childWidthSpec, childHeightSpec);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent e)
{
int y = (int) e.getRawY();
int x = (int) e.getRawX();
switch (e.getAction())
{
case MotionEvent.ACTION_DOWN:
// 首先拦截down事件,记录y坐标
mLastMotionY = y;
mLastMotionX = x;
break;
case MotionEvent.ACTION_MOVE:
// deltaY > 0 是向下运动,< 0是向上运动
int deltaY = y - mLastMotionY;
int deltaX = x - mLastMotionX;

if ((Math.abs(deltaX) - Math.abs(deltaY)) > 0)
{
return false;
}
if ((Math.abs(deltaY)) < 10)
{
return false;
}
if (isRefreshViewScroll(deltaY))
{
return true;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
break;
}
return false;
}

/*
* 如果在onInterceptTouchEvent()方法中没有拦截(即onInterceptTouchEvent()方法中 return
* false)则由PullToRefreshView 的子View来处理;否则由下面的方法来处理(即由PullToRefreshView自己来处理)
*/
@Override
public boolean onTouchEvent(MotionEvent event)
{
//      if (mLock) {
//          return true;
//      }
int y = (int) event.getRawY();
switch (event.getAction())
{
case MotionEvent.ACTION_DOWN:
// onInterceptTouchEvent已经记录
// mLastMotionY = y;
break;
case MotionEvent.ACTION_MOVE:
int deltaY = y - mLastMotionY;
if (mPullState == PULL_DOWN_STATE)
{//执行下拉
headerPrepareToRefresh(deltaY);
// setHeaderPadding(-mHeaderViewHeight);
} else if (mPullState == PULL_UP_STATE)
{//执行上拉
//                    footerPrepareToRefresh(deltaY);
}
mLastMotionY = y;
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
int topMargin = getHeaderTopMargin();
if (mPullState == PULL_DOWN_STATE)
{
if (topMargin >= 0)
{
// 开始刷新
headerRefreshing();
} else
{
// 还没有执行刷新，重新隐藏
setHeaderTopMargin(-mHeaderViewHeight);
}
} else if (mPullState == PULL_UP_STATE)
{
if (Math.abs(topMargin) >= mHeaderViewHeight + mFooterViewHeight)
{
// 开始执行footer 刷新
//                        footerRefreshing();
} else
{
// 还没有执行刷新，重新隐藏
setHeaderTopMargin(-mHeaderViewHeight);
}
}
break;
}
return super.onTouchEvent(event);
}

/**
* 是否应该到了父View,即PullToRefreshView滑动
*
* @param deltaY , deltaY > 0 是向下运动,< 0是向上运动
* @return
*/
private boolean isRefreshViewScroll(int deltaY)
{
if (mHeaderState == REFRESHING || mFooterState == REFRESHING)
{
return false;
}
//对于ListView和GridView
if (mAdapterView != null)
{
// 子view(ListView or GridView)滑动到最顶端
if (deltaY > 0)
{

View child = mAdapterView.getChildAt(0);
if (child == null)
{
// 如果mAdapterView中没有数据,不拦截
return false;
}
if (mAdapterView.getFirstVisiblePosition() == 0 && child.getTop() == 0)
{
mPullState = PULL_DOWN_STATE;
return true;
}
int top = child.getTop();
int padding = mAdapterView.getPaddingTop();
if (mAdapterView.getFirstVisiblePosition() == 0 && Math.abs(top - padding) <= 8)
{//这里之前用3可以判断,但现在不行,还没找到原因
mPullState = PULL_DOWN_STATE;
return true;
}

} else if (deltaY < 0)
{
View lastChild = mAdapterView.getChildAt(mAdapterView.getChildCount() - 1);
if (lastChild == null)
{
// 如果mAdapterView中没有数据,不拦截
return false;
}
// 最后一个子view的Bottom小于父View的高度说明mAdapterView的数据没有填满父view,
// 等于父View的高度说明mAdapterView已经滑动到最后
if (lastChild.getBottom() <= getHeight()
&& mAdapterView.getLastVisiblePosition() == mAdapterView.getCount() - 1)
{
mPullState = PULL_UP_STATE;
return true;
}
}
}
// 对于ScrollView
if (mScrollView != null)
{
// 子scroll view滑动到最顶端
View child = mScrollView.getChildAt(0);
if (deltaY > 0 && mScrollView.getScrollY() == 0)
{
mPullState = PULL_DOWN_STATE;
return true;
} else if (deltaY < 0 && child.getMeasuredHeight() <= getHeight() + mScrollView.getScrollY())
{
mPullState = PULL_UP_STATE;
return true;
}
}
return false;
}

/**
* header 准备刷新,手指移动过程,还没有释放
*
* @param deltaY ,手指滑动的距离
*/
private void headerPrepareToRefresh(int deltaY)
{
int newTopMargin = changingHeaderViewTopMargin(deltaY);
// 当header view的topMargin>=0时，说明已经完全显示出来了,修改header view 的提示状态
if (newTopMargin >= 0 && mHeaderState != RELEASE_TO_REFRESH)
{
mHeaderTextView.setText(R.string.pull_to_refresh_release_label);
mHeaderUpdateTextView.setVisibility(View.VISIBLE);
mHeaderImageView.clearAnimation();
mHeaderImageView.startAnimation(mFlipAnimation);
mHeaderState = RELEASE_TO_REFRESH;
} else if (newTopMargin < 0 && newTopMargin > -mHeaderViewHeight)
{// 拖动时没有释放
mHeaderImageView.clearAnimation();
mHeaderImageView.startAnimation(mFlipAnimation);
// mHeaderImageView.
mHeaderTextView.setText(R.string.pull_to_refresh_pull_label);
mHeaderState = PULL_TO_REFRESH;
}
}

/**
* footer 准备刷新,手指移动过程,还没有释放 移动footer view高度同样和移动header view
* 高度是一样，都是通过修改header view的topmargin的值来达到
*
* @param deltaY ,手指滑动的距离
*/
private void footerPrepareToRefresh(int deltaY)
{
int newTopMargin = changingHeaderViewTopMargin(deltaY);
// 如果header view topMargin 的绝对值大于或等于header + footer 的高度
// 说明footer view 完全显示出来了，修改footer view 的提示状态
if (Math.abs(newTopMargin) >= (mHeaderViewHeight + mFooterViewHeight) && mFooterState != RELEASE_TO_REFRESH)
{
mFooterTextView.setText(R.string.pull_to_refresh_footer_release_label);
mFooterImageView.clearAnimation();
mFooterImageView.startAnimation(mFlipAnimation);
mFooterState = RELEASE_TO_REFRESH;
} else if (Math.abs(newTopMargin) < (mHeaderViewHeight + mFooterViewHeight))
{
mFooterImageView.clearAnimation();
mFooterImageView.startAnimation(mFlipAnimation);
mFooterTextView.setText(R.string.pull_to_refresh_footer_pull_label);
mFooterState = PULL_TO_REFRESH;
}
}

/**
* 修改Header view top margin的值
*
* @param deltaY
*/
private int changingHeaderViewTopMargin(int deltaY)
{
LayoutParams params = (LayoutParams) mHeaderView.getLayoutParams();
float newTopMargin = params.topMargin + deltaY * 0.3f;
//这里对上拉做一下限制,因为当前上拉后然后不释放手指直接下拉,会把下拉刷新给触发了,感谢网友yufengzungzhe的指出
//表示如果是在上拉后一段距离,然后直接下拉
if (deltaY > 0 && mPullState == PULL_UP_STATE && Math.abs(params.topMargin) <= mHeaderViewHeight)
{
return params.topMargin;
}
//同样地,对下拉做一下限制,避免出现跟上拉操作时一样的bug
if (deltaY < 0 && mPullState == PULL_DOWN_STATE && Math.abs(params.topMargin) >= mHeaderViewHeight)
{
return params.topMargin;
}
params.topMargin = (int) newTopMargin;
mHeaderView.setLayoutParams(params);
invalidate();
return params.topMargin;
}

/**
* header refreshing
*/
private void headerRefreshing()
{
mHeaderState = REFRESHING;
setHeaderTopMargin(0);
mHeaderImageView.setVisibility(View.GONE);
mHeaderImageView.clearAnimation();
mHeaderImageView.setImageDrawable(null);
mHeaderProgressBar.setVisibility(View.VISIBLE);
mHeaderTextView.setText(R.string.pull_to_refresh_refreshing_label);
if (mOnHeaderRefreshListener != null)
{
mOnHeaderRefreshListener.onHeaderRefresh(this);
}
}

/**
* footer refreshing
*/
private void footerRefreshing()
{
mFooterState = REFRESHING;
int top = mHeaderViewHeight + mFooterViewHeight;
setHeaderTopMargin(-top);
mFooterImageView.setVisibility(View.GONE);
mFooterImageView.clearAnimation();
mFooterImageView.setImageDrawable(null);
mFooterProgressBar.setVisibility(View.VISIBLE);
mFooterTextView.setText(R.string.pull_to_refresh_footer_refreshing_label);
if (mOnFooterRefreshListener != null)
{
mOnFooterRefreshListener.onFooterRefresh(this);
}
}

/**
* 设置header view 的topMargin的值
*
* @param topMargin ，为0时，说明header view 刚好完全显示出来； 为-mHeaderViewHeight时，说明完全隐藏了
*/
private void setHeaderTopMargin(int topMargin)
{
LayoutParams params = (LayoutParams) mHeaderView.getLayoutParams();
params.topMargin = topMargin;
mHeaderView.setLayoutParams(params);
invalidate();
}

/**
* header view 完成更新后恢复初始状态
*/
public void onHeaderRefreshComplete()
{
setHeaderTopMargin(-mHeaderViewHeight);
mHeaderImageView.setVisibility(View.VISIBLE);
mHeaderImageView.setImageResource(R.mipmap.ic_pulltorefresh_arrow);
mHeaderTextView.setText(R.string.pull_to_refresh_pull_label);
mHeaderProgressBar.setVisibility(View.GONE);
// mHeaderUpdateTextView.setText("");
mHeaderState = PULL_TO_REFRESH;
}

/**
* Resets the list to a normal state after a refresh.
*
* @param lastUpdated Last updated at.
*/
public void onHeaderRefreshComplete(CharSequence lastUpdated)
{
setLastUpdated(lastUpdated);
onHeaderRefreshComplete();
}

/**
* footer view 完成更新后恢复初始状态
*/
public void onFooterRefreshComplete()
{
setHeaderTopMargin(-mHeaderViewHeight);
mFooterImageView.setVisibility(View.VISIBLE);
mFooterImageView.setImageResource(R.mipmap.ic_pulltorefresh_arrow_up);
mFooterTextView.setText(R.string.pull_to_refresh_footer_pull_label);
mFooterProgressBar.setVisibility(View.GONE);
// mHeaderUpdateTextView.setText("");
mFooterState = PULL_TO_REFRESH;
}

/**
* Set a text to represent when the list was last updated.
*
* @param lastUpdated Last updated at.
*/
public void setLastUpdated(CharSequence lastUpdated)
{
if (lastUpdated != null)
{
mHeaderUpdateTextView.setVisibility(View.VISIBLE);
mHeaderUpdateTextView.setText(lastUpdated);
} else
{
mHeaderUpdateTextView.setVisibility(View.GONE);
}
}

/**
* 获取当前header view 的topMargin
*/
private int getHeaderTopMargin()
{
LayoutParams params = (LayoutParams) mHeaderView.getLayoutParams();
return params.topMargin;
}

//  /**
//   * lock
//   *
//   */
//  private void lock() {
//      mLock = true;
//  }
//
//  /**
//   * unlock
//   *
//   */
//  private void unlock() {
//      mLock = false;
//  }

/**
* set headerRefreshListener
*
* @param headerRefreshListener
*/
public void setOnHeaderRefreshListener(OnHeaderRefreshListener headerRefreshListener)
{
mOnHeaderRefreshListener = headerRefreshListener;
}

public void setOnFooterRefreshListener(OnFooterRefreshListener footerRefreshListener)
{
mOnFooterRefreshListener = footerRefreshListener;
}

/**
* Interface definition for a callback to be invoked when list/grid footer
* view should be refreshed.
*/
public interface OnFooterRefreshListener
{
public void onFooterRefresh(PullToRefreshView view);
}

/**
* Interface definition for a callback to be invoked when list/grid header
* view should be refreshed.
*/
public interface OnHeaderRefreshListener
{
public void onHeaderRefresh(PullToRefreshView view);
}
}