import android.content.Context;
import android.database.DataSetObserver;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.PointF;
import android.graphics.Rect;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.GradientDrawable.Orientation;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.SoundEffectConstants;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.accessibility.AccessibilityEvent;
import android.widget.AbsListView;
import android.widget.HeaderViewListAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SectionIndexer;
/**
 * ListView, which is capable to pin section views at its top while the rest is still scrolled.
 */
public class PinnedSectionListView extends ListView {
    //-- inner classes
    /** List adapter to be implemented for being used with PinnedSectionListView adapter. */
    public static interface PinnedSectionListAdapter extends ListAdapter {
        /** This method shall return 'true' if views of given type has to be pinned. */
        boolean isItemViewTypePinned(int viewType);
        //这里向外提供回调接口
        void getShadowPosition(int position);
    }
    /** Wrapper class for pinned section view and its position in the list. */
    static class PinnedSection {
        public View view;
        public int position;
        public long id;
    }
    //-- class fields
    // fields used for handling touch events
    private final Rect mTouchRect = new Rect();
    private final PointF mTouchPoint = new PointF();
    private int mTouchSlop;
    private View mTouchTarget;
    private MotionEvent mDownEvent;
    // fields used for drawing shadow under a pinned section
    private GradientDrawable mShadowDrawable;
    private int mSectionsDistanceY;
    private int mShadowHeight;
    /** Delegating listener, can be null. */
    OnScrollListener mDelegateOnScrollListener;
    /** Shadow for being recycled, can be null. */
    PinnedSection mRecycleSection;
    /** shadow instance with a pinned view, can be null. */
    PinnedSection mPinnedSection;
    /** Pinned view Y-translation. We use it to stick pinned view to the next section. */
    int mTranslateY;
    /** Scroll listener which does the magic */
    private final OnScrollListener mOnScrollListener = new OnScrollListener() {
        @Override public void onScrollStateChanged(AbsListView view, int scrollState) {
            if (mDelegateOnScrollListener != null) { // delegate
                mDelegateOnScrollListener.onScrollStateChanged(view, scrollState);
            }
        }
        @Override
        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
            if (mDelegateOnScrollListener != null) { // delegate
                mDelegateOnScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
            }
            // get expected adapter or fail fast
            ListAdapter adapter = getAdapter();
            if (adapter == null || visibleItemCount == 0) return; // nothing to do
            final boolean isFirstVisibleItemSection =
                    isItemViewTypePinned(adapter, adapter.getItemViewType(firstVisibleItem));
            if (isFirstVisibleItemSection) {
                View sectionView = getChildAt(0);
                if (sectionView.getTop() == getPaddingTop()) { // view sticks to the top, no need for pinned shadow
                    destroyPinnedShadow();
                } else { // section doesn't stick to the top, make sure we have a pinned shadow
                    ensureShadowForPosition(firstVisibleItem, firstVisibleItem, visibleItemCount);
                }
            } else { // section is not at the first visible position
                int sectionPosition = findCurrentSectionPosition(firstVisibleItem);
                if (sectionPosition > -1) { // we have section position
                    ensureShadowForPosition(sectionPosition, firstVisibleItem, visibleItemCount);
                } else { // there is no section for the first visible item, destroy shadow
                    destroyPinnedShadow();
                }
            }
        };
    };
    /** Default change observer. */
    private final DataSetObserver mDataSetObserver = new DataSetObserver() {
        @Override public void onChanged() {
            recreatePinnedShadow();
        };
        @Override public void onInvalidated() {
            recreatePinnedShadow();
        }
    };
    //-- constructors
    public PinnedSectionListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView();
    }
    public PinnedSectionListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initView();
    }
    private void initView() {
        setOnScrollListener(mOnScrollListener);
        mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
        initShadow(true);
    }
    //-- public API methods
    public void setShadowVisible(boolean visible) {
        initShadow(visible);
        if (mPinnedSection != null) {
            View v = mPinnedSection.view;
            invalidate(v.getLeft(), v.getTop(), v.getRight(), v.getBottom() + mShadowHeight);
        }
    }
    //-- pinned section drawing methods
    public void initShadow(boolean visible) {
        if (visible) {
            if (mShadowDrawable == null) {
                mShadowDrawable = new GradientDrawable(Orientation.TOP_BOTTOM,
                        new int[] { Color.parseColor("#ffa0a0a0"), Color.parseColor("#50a0a0a0"), Color.parseColor("#00a0a0a0")});
                mShadowHeight = (int) (8 * getResources().getDisplayMetrics().density);
            }
        } else {
            if (mShadowDrawable != null) {
                mShadowDrawable = null;
                mShadowHeight = 0;
            }
        }
    }
    /** Create shadow wrapper with a pinned view for a view at given position */
    void createPinnedShadow(int position) {
//滑动的时候产生pinnedshadow，替换产生，或者新产生
        // try to recycle shadow
//((PinnedSectionListAdapter) getAdapter())获得对外回调接口对象，提供第几个位置产生数据
        ((PinnedSectionListAdapter) getAdapter()).getShadowPosition(position);
        PinnedSection pinnedShadow = mRecycleSection;
        mRecycleSection = null;
        // create new shadow, if needed
        if (pinnedShadow == null) pinnedShadow = new PinnedSection();
        // request new view using recycled view, if such
        View pinnedView = getAdapter().getView(position, pinnedShadow.view, PinnedSectionListView.this);
        // read layout parameters
        LayoutParams layoutParams = (LayoutParams) pinnedView.getLayoutParams();
        if (layoutParams == null) { // create default layout params
            layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        }
        int heightMode = MeasureSpec.getMode(layoutParams.height);
        int heightSize = MeasureSpec.getSize(layoutParams.height);
        if (heightMode == MeasureSpec.UNSPECIFIED) heightMode = MeasureSpec.EXACTLY;
        int maxHeight = getHeight() - getListPaddingTop() - getListPaddingBottom();
        if (heightSize > maxHeight) heightSize = maxHeight;
        // measure & layout
        int ws = MeasureSpec.makeMeasureSpec(getWidth() - getListPaddingLeft() - getListPaddingRight(), MeasureSpec.EXACTLY);
        int hs = MeasureSpec.makeMeasureSpec(heightSize, heightMode);
        pinnedView.measure(ws, hs);
        pinnedView.layout(0, 0, pinnedView.getMeasuredWidth(), pinnedView.getMeasuredHeight());
        mTranslateY = 0;
        // initialize pinned shadow
        pinnedShadow.view = pinnedView;
        pinnedShadow.position = position;
        pinnedShadow.id = getAdapter().getItemId(position);
        // store pinned shadow
        mPinnedSection = pinnedShadow;
    }
    /** Destroy shadow wrapper for currently pinned view */
    void destroyPinnedShadow() {
        if (mPinnedSection != null) {
            // keep shadow for being recycled later
            mRecycleSection = mPinnedSection;
            mPinnedSection = null;
        }
    }
    /** Makes sure we have an actual pinned shadow for given position. */
    void ensureShadowForPosition(int sectionPosition, int firstVisibleItem, int visibleItemCount) {
        if (visibleItemCount < 2) { // no need for creating shadow at all, we have a single visible item
            destroyPinnedShadow();
            return;
        }
        if (mPinnedSection != null
                && mPinnedSection.position != sectionPosition) { // invalidate shadow, if required
            destroyPinnedShadow();
        }
        if (mPinnedSection == null) { // create shadow, if empty
            createPinnedShadow(sectionPosition);
        }
        // align shadow according to next section position, if needed
        int nextPosition = sectionPosition + 1;
        if (nextPosition < getCount()) {
            int nextSectionPosition = findFirstVisibleSectionPosition(nextPosition,
                    visibleItemCount - (nextPosition - firstVisibleItem));
            if (nextSectionPosition > -1) {
                View nextSectionView = getChildAt(nextSectionPosition - firstVisibleItem);
                final int bottom = mPinnedSection.view.getBottom() + getPaddingTop();
                mSectionsDistanceY = nextSectionView.getTop() - bottom;
                if (mSectionsDistanceY < 0) {
                    // next section overlaps pinned shadow, move it up
                    mTranslateY = mSectionsDistanceY;
                } else {
                    // next section does not overlap with pinned, stick to top
                    mTranslateY = 0;
                }
            } else {
                // no other sections are visible, stick to top
                mTranslateY = 0;
                mSectionsDistanceY = Integer.MAX_VALUE;
            }
        }
    }
    int findFirstVisibleSectionPosition(int firstVisibleItem, int visibleItemCount) {
        ListAdapter adapter = getAdapter();
        for (int childIndex = 0; childIndex < visibleItemCount; childIndex++) {
            int position = firstVisibleItem + childIndex;
            int viewType = adapter.getItemViewType(position);
            if (isItemViewTypePinned(adapter, viewType)) return position;
        }
        return -1;
    }
    int findCurrentSectionPosition(int fromPosition) {
        ListAdapter adapter = getAdapter();
        if (adapter instanceof SectionIndexer) {
            // try fast way by asking section indexer
            SectionIndexer indexer = (SectionIndexer) adapter;
            int sectionPosition = indexer.getSectionForPosition(fromPosition);
            int itemPosition = indexer.getPositionForSection(sectionPosition);
            int typeView = adapter.getItemViewType(itemPosition);
            if (isItemViewTypePinned(adapter, typeView)) {
                return itemPosition;
            } // else, no luck
        }
        // try slow way by looking through to the next section item above
        for (int position=fromPosition; position>=0; position--) {
            int viewType = adapter.getItemViewType(position);
            if (isItemViewTypePinned(adapter, viewType)) return position;
        }
        return -1; // no candidate found
    }
    void recreatePinnedShadow() {
        destroyPinnedShadow();
        ListAdapter adapter = getAdapter();
        if (adapter != null && adapter.getCount() > 0) {
            int firstVisiblePosition = getFirstVisiblePosition();
            int sectionPosition = findCurrentSectionPosition(firstVisiblePosition);
            if (sectionPosition == -1) return; // no views to pin, exit
            ensureShadowForPosition(sectionPosition,
                    firstVisiblePosition, getLastVisiblePosition() - firstVisiblePosition);
        }
    }
    @Override
    public void setOnScrollListener(OnScrollListener listener) {
        if (listener == mOnScrollListener) {
            super.setOnScrollListener(listener);
        } else {
            mDelegateOnScrollListener = listener;
        }
    }
    @Override
    public void onRestoreInstanceState(Parcelable state) {
        super.onRestoreInstanceState(state);
        post(new Runnable() {
            @Override public void run() { // restore pinned view after configuration change
                recreatePinnedShadow();
            }
        });
    }
    @Override
    public void setAdapter(ListAdapter adapter) {
        // assert adapter in debug mode
//      if (BuildConfig.DEBUG && adapter != null) {
        if (adapter != null) {
            if (!(adapter instanceof PinnedSectionListAdapter))
                throw new IllegalArgumentException("Does your adapter implement PinnedSectionListAdapter?");
            if (adapter.getViewTypeCount() < 2)
                throw new IllegalArgumentException("Does your adapter handle at least two types" +
                        " of views in getViewTypeCount() method: items and sections?");
        }
        // unregister observer at old adapter and register on new one
        ListAdapter oldAdapter = getAdapter();
        if (oldAdapter != null) oldAdapter.unregisterDataSetObserver(mDataSetObserver);
        if (adapter != null) adapter.registerDataSetObserver(mDataSetObserver);
        // destroy pinned shadow, if new adapter is not same as old one
        if (oldAdapter != adapter) destroyPinnedShadow();
        super.setAdapter(adapter);
    }
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        if (mPinnedSection != null) {
            int parentWidth = r - l - getPaddingLeft() - getPaddingRight();
            int shadowWidth = mPinnedSection.view.getWidth();
            if (parentWidth != shadowWidth) {
                recreatePinnedShadow();
            }
        }
    }
    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
        if (mPinnedSection != null) {
            // prepare variables
            int pLeft = getListPaddingLeft();
            int pTop = getListPaddingTop();
            View view = mPinnedSection.view;
            // draw child
            canvas.save();
            int clipHeight = view.getHeight() +
                    (mShadowDrawable == null ? 0 : Math.min(mShadowHeight, mSectionsDistanceY));
            canvas.clipRect(pLeft, pTop, pLeft + view.getWidth(), pTop + clipHeight);
            canvas.translate(pLeft, pTop + mTranslateY);
            drawChild(canvas, mPinnedSection.view, getDrawingTime());
            if (mShadowDrawable != null && mSectionsDistanceY > 0) {
                mShadowDrawable.setBounds(mPinnedSection.view.getLeft(),
                        mPinnedSection.view.getBottom(),
                        mPinnedSection.view.getRight(),
                        mPinnedSection.view.getBottom() + mShadowHeight);
                mShadowDrawable.draw(canvas);
            }
            canvas.restore();
        }
    }
    //-- touch handling methods
    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        final float x = ev.getX();
        final float y = ev.getY();
        final int action = ev.getAction();
        if (action == MotionEvent.ACTION_DOWN
                && mTouchTarget == null
                && mPinnedSection != null
                && isPinnedViewTouched(mPinnedSection.view, x, y)) { // create touch target
            // user touched pinned view
            mTouchTarget = mPinnedSection.view;
            mTouchPoint.x = x;
            mTouchPoint.y = y;
            // copy down event for eventually be used later
            mDownEvent = MotionEvent.obtain(ev);
        }
        if (mTouchTarget != null) {
            if (isPinnedViewTouched(mTouchTarget, x, y)) { // forward event to pinned view
                mTouchTarget.dispatchTouchEvent(ev);
            }
            if (action == MotionEvent.ACTION_UP) { // perform onClick on pinned view
                super.dispatchTouchEvent(ev);
                performPinnedItemClick();
                clearTouchTarget();
            } else if (action == MotionEvent.ACTION_CANCEL) { // cancel
                clearTouchTarget();
            } else if (action == MotionEvent.ACTION_MOVE) {
                if (Math.abs(y - mTouchPoint.y) > mTouchSlop) {
                    // cancel sequence on touch target
                    MotionEvent event = MotionEvent.obtain(ev);
                    event.setAction(MotionEvent.ACTION_CANCEL);
                    mTouchTarget.dispatchTouchEvent(event);
                    event.recycle();
                    // provide correct sequence to super class for further handling
                    super.dispatchTouchEvent(mDownEvent);
                    super.dispatchTouchEvent(ev);
                    clearTouchTarget();
                }
            }
            return true;
        }
        // call super if this was not our pinned view
        return super.dispatchTouchEvent(ev);
    }
    private boolean isPinnedViewTouched(View view, float x, float y) {
        view.getHitRect(mTouchRect);
        // by taping top or bottom padding, the list performs on click on a border item.
        // we don't add top padding here to keep behavior consistent.
        mTouchRect.top += mTranslateY;
        mTouchRect.bottom += mTranslateY + getPaddingTop();
        mTouchRect.left += getPaddingLeft();
        mTouchRect.right -= getPaddingRight();
        return mTouchRect.contains((int)x, (int)y);
    }
    private void clearTouchTarget() {
        mTouchTarget = null;
        if (mDownEvent != null) {
            mDownEvent.recycle();
            mDownEvent = null;
        }
    }
    private boolean performPinnedItemClick() {
        if (mPinnedSection == null) return false;
        OnItemClickListener listener = getOnItemClickListener();
        if (listener != null) {
            View view =  mPinnedSection.view;
            playSoundEffect(SoundEffectConstants.CLICK);
            if (view != null) {
                view.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
            }
            listener.onItemClick(this, view, mPinnedSection.position, mPinnedSection.id);
            return true;
        }
        return false;
    }
    public static boolean isItemViewTypePinned(ListAdapter adapter, int viewType) {
        if (adapter instanceof HeaderViewListAdapter) {
            adapter = ((HeaderViewListAdapter)adapter).getWrappedAdapter();
        }
        return ((PinnedSectionListAdapter) adapter).isItemViewTypePinned(viewType);
    }
}

mContentAdapter = new AutoOrderingAdapter(AutoOrderingActivity.this,mArrProduct ,mHandler , new LeftAdapter() {
        @Override
        public void refreshLeftAdapter(int position) {
            // TODO Auto-generated method stub
            for(int i = 0 ; i < mArrType.size() ; i++){
                if(mArrType.get(i).pos == position){
                    mTitleAdapter.refresh(mArrType, i);
                }
            }
        }
    });

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import java.util.ArrayList;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import com.pupuwang.ycyl.R;
import com.pupuwang.ycyl.main.home.shops.model.ShopProduct;
import com.pupuwang.ycyl.ordering.AutoOrderingAdapter.ViewHolder;
import com.pupuwang.ycyl.view.PinnedSectionListView.PinnedSectionListAdapter;
public class AutoOrderingAdapter extends BaseAdapter implements PinnedSectionListAdapter{
    public void refresh(ArrayList arr){
        setArr(arr);
        notifyDataSetChanged();
    }
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return arr.size();
    }
    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return arr.get(position);
    }
    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ViewHolder holder = null;
        if (convertView == null ||null == (ViewHolder) convertView.getTag(R.id.idkey0 + (position+1)*1000)) {
            holder = new ViewHolder();
            convertView = mInflater.inflate(R.layout.auto_ordering_child_item, null);
            initHolder(convertView, holder);
            convertView.setTag(R.id.idkey0 + (position+1)*1000, holder);
        }else{
            holder = (ViewHolder) convertView.getTag(R.id.idkey0 + (position+1)*1000);
        }
    }
                      
    @Override
    public boolean isItemViewTypePinned(int viewType) {
        // TODO Auto-generated method stub
        return viewType == 0;//0是标题，1是内容
    }
                      
      @Override
      public int getViewTypeCount() {
          return 2;//2种view的类型 baseAdapter中得方法
      }
      @Override
      public int getItemViewType(int position) {
          return ((ShopProduct)getItem(position)).getTitleType();
      }
                      
@Override
    public void getShadowPosition(int position) {
        // TODO Auto-generated method stub
        Log.e("tag", "--------------position: "+ position);
        left.refreshLeftAdapter(position);
    }

BaseAdapter中不仅仅只有常用必重写得4个方法，还有写方法特殊情况下需要用得getViewTypeCount()

其中主要代码效果在github中找的自己研究下，关于淘点点得效果，还需要另外一个listview相互控制，希望大家能贡献更多得源码，大家不在苦逼。

本文标题：PinnedSectionListView有阴影效果，类似淘点点点餐
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