首先，本文代码部分参考了conglida博主写的自定义scrollview 实现标题栏渐变：

http://download.csdn.net/download/conglida/9183723

此资源只使用自定义scrollview 实现标题栏渐变和上拉下拉刷新。如果需要listview，等其他控件，需实现onScrollListener，在onscroll中嵌入渐变代码。

再次感谢conglida博主的无私奉献！

由于Recyclerview已经推出很长时间了，不得不说这个控件确实好，可以替代scrollview、listview、gridview，功能很强大，目前我已经用这个新控件实现了标题栏渐变的效果。

本代码使用了三方开源组件：

部分代码：

CommonHeader headerView;    private void initView(View view) {        mSwipeRefreshLayout = (SwipeRefreshLayout)view.findViewById(R.id.swipe_container);        mSwipeRefreshLayout.setProgressViewOffset(false, 0, Util.dip2px(getActivity(), 92));        //设置刷新时动画的颜色，可以设置4个        mSwipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_light, android.R.color.holo_red_light, android.R.color.holo_orange_light, android.R.color.holo_green_light);        mSwipeRefreshLayout.setOnRefreshListener(this);        mSwipeRefreshLayout.setRefreshing(true);        mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);        mGridAdapter = new HotsGridAdapter(getActivity(),mHandler);        mHeaderAndFooterRecyclerViewAdapter = new HeaderAndFooterRecyclerViewAdapter(mGridAdapter);        mRecyclerView.setAdapter(mHeaderAndFooterRecyclerViewAdapter);        layoutManager = new GridLayoutManager(getActivity(), 2);        layoutManager.setSpanSizeLookup(new HeaderSpanSizeLookup((HeaderAndFooterRecyclerViewAdapter) mRecyclerView.getAdapter(), layoutManager.getSpanCount()));        layoutManager.setOrientation(GridLayoutManager.VERTICAL);        layoutManager.setSmoothScrollbarEnabled(true);        mRecyclerView.setHasFixedSize(true);        mRecyclerView.setLayoutManager(layoutManager);        headerView = new CommonHeader(getActivity(),R.layout.layout_home_header);        RecyclerViewUtils.setHeaderView(mRecyclerView, headerView);        mTitlebar = (RelativeLayout) view.findViewById(R.id.index_title_bar);        mTitlebar.setVisibility(View.VISIBLE);        mTitlebar.getBackground().setAlpha(0);        keyTextView = (TextView) mTitlebar.findViewById(R.id.tv_title);        mCurCityText = (TextView) mTitlebar.findViewById(R.id.current_city_text);        categorizeTextView = (TextView) view.findViewById(R.id.image_right);        slideShowView = (SlideShowView) headerView.findViewById(R.id.slideshowView);        moreSpecialProduct = headerView.findViewById(R.id.special_more);        mCurCityText.setOnClickListener(this);        keyTextView.setOnClickListener(this);        moreSpecialProduct.setOnClickListener(this);        categorizeTextView.setOnClickListener(this);        slideShowView = (SlideShowView) headerView.findViewById(R.id.slideshowView);        cart_btn = getActivity().findViewById(R.id.shop_cart_btn);        animation_viewGroup = createAnimLayout();        imageLoader = ImageLoader.getInstance();        mRecyclerView.addOnScrollListener(mOnScrollListener);    }

关键代码：

headerView = new CommonHeader(getActivity(),R.layout.layout_home_header);

        RecyclerViewUtils.setHeaderView(mRecyclerView, headerView);

为RecyclerView添加headerview，headview包括了所有的其他view，如下图所示，所看到的view都包含在headerView里面，不包括titlebar哦。

滑动监听事件：

boolean pauseOnScroll = false, pauseOnFling=true;    private RecyclerOnScrollListener mOnScrollListener = new RecyclerOnScrollListener() {        @Override        public void onScrolled(int dx, int dy) {            super.onScrolled(dx, dy);            if (slideShowView.getHeight() > 0) {                //define it for scroll height                int lHeight = slideShowView.getHeight();                if(dy < 0){                    mTitlebar.getBackground().setAlpha(0);                }else {                    if (dy < lHeight) {                        int progress = (int) (new Float(dy) / new Float(lHeight) * 200);//255                        mTitlebar.getBackground().setAlpha(progress);                    } else {                        mTitlebar.getBackground().setAlpha(255 - 55);                    }                }            }        }        @Override        public void onBottom() {            super.onBottom();            Log.d(TAG, "onBottom");            LoadingFooter.State state = RecyclerViewStateUtils.getFooterViewState(mRecyclerView);            if(state == LoadingFooter.State.Loading) {                Log.d(TAG, "the state is Loading, just wait..");                return;            }            if (mCurPageIndex < totalPage) {                // loading more                RecyclerViewStateUtils.setFooterViewState(getActivity(), mRecyclerView, REQUEST_COUNT, LoadingFooter.State.Loading, null);                mHandler.sendEmptyMessage(GET_LIST_DATA);                Log.d(TAG, "onBottom loading");            } else {                //the end                RecyclerViewStateUtils.setFooterViewState(getActivity(), mRecyclerView, REQUEST_COUNT, LoadingFooter.State.TheEnd, null);            }        }        @Override        public void onScrollStateChanged(int newState) {            //根据newState状态做处理            if (imageLoader != null) {                switch (newState) {                    case 0:                        imageLoader.resume();                        break;                    case 1:                        if (pauseOnScroll) {                            imageLoader.pause();                        } else {                            imageLoader.resume();                        }                        break;                    case 2:                        if (pauseOnFling) {                            imageLoader.pause();                        } else {                            imageLoader.resume();                        }                        break;                }            }        }    };

代码中涉及到的封装控件下载：http://download.csdn.net/detail/jdsjlzx/9391838，没有demo，请大家自行实现效果。

具体原理请参考

conglida博主写的自定义scrollview 实现标题栏渐变：

http://download.csdn.net/download/conglida/9183723