android仿QQ列表实现

主要是2个功能

1、列表滑动当前组名始终在上面显示

2、下拉刷新

在网上找到相似的例子，修改一些以后，加以整合

以下是关键代码部分

1）组名在前面显示

private LinearLayout _groupLayout;public ExpandableListAdapter exAdapter = null; private int _groupIndex = -1; public boolean collapse = false;

@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {firstItemIndex = firstVisibleItem;//this.visibleItemCount = arg2;//visibleLastIndex = firstItemIndex + visibleItemCount - 1;if (exAdapter == null)               exAdapter = this.getExpandableListAdapter();           int ptp = view.pointToPosition(0,0);           if (ptp != AdapterView.INVALID_POSITION)        {           UserListView qExlist = (UserListView) view;                     long pos = qExlist.getExpandableListPosition(ptp);               int groupPos = ExpandableListView.getPackedPositionGroup(pos);               int childPos = ExpandableListView.getPackedPositionChild(pos);             if (groupPos < _groupIndex)             {                   _groupIndex = groupPos;                                      if (_groupLayout != null){                       _groupLayout.removeAllViews();                       _groupLayout.setVisibility(GONE);//这里设置Gone 为了不让它遮挡后面header                   }               }            else if (groupPos >= _groupIndex)             {                    long posNext = qExlist.getExpandableListPosition(ptp+1);                       int groupPosNext = ExpandableListView.getPackedPositionGroup(posNext);                       int childPosNext = ExpandableListView.getPackedPositionChild(posNext);                     final FrameLayout fl = (FrameLayout) getParent();                     if(childPosNext < 0)            {            return;            }                    JDingDebug.printfSystem("index" + _groupIndex + "  pos:" + groupPos + " child:" + childPosNext);               if(_groupIndex == groupPos && groupPos != 0)                   {                   return;                   }               if(groupPos == 0 && childPosNext == 0)               {               return;               }                             _groupIndex = groupPos;   //                if (_groupLayout != null)   //                fl.removeView(_groupLayout);                  _groupLayout = (LinearLayout)getExpandableListAdapter().getGroupView(groupPos, true, null, null);                  // JDingDebug.printfSystem("_groupLayout:" + _groupLayout);                fl.addView(_groupLayout,fl.getChildCount(), new LayoutParams(                           LayoutParams.FILL_PARENT, 40));                  _groupLayout.setOnClickListener(new OnClickListener()                {                       @Override                      public void onClick(View v)                     {                       JDingDebug.printfSystem("按下");                        collapseGroup(_groupIndex);                        new Handler().post(new Runnable()                         {                               @Override                              public void run() {                                   fl.removeViews(1, fl.getChildCount()-1);                            }                           });                       }                   });                              }           }   }

2）下拉刷新

private final static int RELEASE_To_REFRESH = 0;private final static int PULL_To_REFRESH = 1;private final static int REFRESHING = 2;private final static int DONE = 3;private final static int LOADING = 4;private boolean isRefreshable;private int firstItemIndex;private boolean isRecored;private int startY;private int state;private boolean isBack;

// 实际的padding的距离与界面上偏移距离的比例private final static int RATIO = 3;private int headContentWidth;private int headContentHeight;private LinearLayout headView;private LayoutInflater inflater;

@Overridepublic boolean onTouchEvent(MotionEvent event) {if (isRefreshable) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:if (firstItemIndex == 0 && !isRecored) {isRecored = true;startY = (int) event.getY();}break;case MotionEvent.ACTION_UP:if (state != REFRESHING && state != LOADING) {if (state == DONE) {// 什么都不做}if (state == PULL_To_REFRESH) {state = DONE;resetHeadView();//changeHeaderViewByState();
//Log.v(TAG, "由下拉刷新状态，到done状态");}if (state == RELEASE_To_REFRESH) {state = REFRESHING;//onRefresh();resetHeadView();}}isRecored = false;isBack = false;break;case MotionEvent.ACTION_MOVE:int tempY = (int) event.getY();if (!isRecored && firstItemIndex == 0) {isRecored = true;startY = tempY;}if (state != REFRESHING && isRecored && state != LOADING) {if (state == RELEASE_To_REFRESH) {setSelection(0);// 往上推了，推到了屏幕足够掩盖head的程度，但是还没有推到全部掩盖的地步if (((tempY - startY) / RATIO < headContentHeight)&& (tempY - startY) > 0) {state = PULL_To_REFRESH;//changeHeaderViewByState();
//Log.v(TAG, "由松开刷新状态转变到下拉刷新状态");}// 一下子推到顶了else if (tempY - startY <= 0) {state = DONE;//changeHeaderViewByState();
//Log.v(TAG, "由松开刷新状态转变到done状态");}// 往下拉了，或者还没有上推到屏幕顶部掩盖head的地步else {// 不用进行特别的操作，只用更新paddingTop的值就行了}}// 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态if (state == PULL_To_REFRESH) {setSelection(0);// 下拉到可以进入RELEASE_TO_REFRESH的状态if ((tempY - startY) / RATIO >= headContentHeight) {state = RELEASE_To_REFRESH;isBack = true;//changeHeaderViewByState();//Log.v(TAG, "由done或者下拉刷新状态转变到松开刷新");}// 上推到顶了else if (tempY - startY <= 0) {state = DONE;//changeHeaderViewByState();//Log.v(TAG, "由DOne或者下拉刷新状态转变到done状态");}}// done状态下if (state == DONE) {if (tempY - startY > 0) {state = PULL_To_REFRESH;//changeHeaderViewByState();}}// 更新headView的sizeif (state == PULL_To_REFRESH) {headView.setPadding(0, -1 * headContentHeight+ (tempY - startY) / RATIO, 0, 0);}// 更新headView的paddingTopif (state == RELEASE_To_REFRESH){headView.setPadding(0, (tempY - startY) / RATIO- headContentHeight, 0, 0);}}break;}}return super.onTouchEvent(event);}

public void resetHeadView(){headView.setPadding(0, -1*headContentHeight, 0, 0);state = DONE;}

// 此方法直接照搬自网络上的一个下拉刷新的demo，此处是“估计”headView的width以及heightprivate 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);}

DEMO下载

http://download.csdn.net/detail/ff313976/4504777

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