# recyclerView 使用场景：
- 加载列表
- 多类型 Item 适配加载列表
- header footer 适配加载列表
- 上拉加载更多 下拉刷新
- 分组 列表
- 分组 悬浮列表
- 拖拽排序
- 侧滑 展开Menu 菜单
加载列表
/** * RecyclerView.Adapter封装 * 实现 基本的初始化 方法 增 删 数据 */public abstract class BaseAdapter extends RecyclerView.Adapter { private Context mContext; private ArrayList mds; public ArrayList getMds() { return mds; } public Context getmContext() { return mContext; } public BaseAdapter(Context context) { mContext = context; this.mds = new ArrayList<>(); } public BaseAdapter(Context context, ArrayList mds) { mContext = context; this.mds = mds; } @Override @NonNull public VH onCreateViewHolder(ViewGroup parent, int viewType) { return onCreateChildViewHolder(parent, viewType); } protected abstract VH onCreateChildViewHolder(ViewGroup parent, int viewType); public void initMDatas(ArrayList ds) { if (ds == null) return; if (ds.size() == 0) return; mds.clear(); mds.addAll(ds); notifyDataSetChanged(); } public void initMDatasToOne(ArrayList ds) { if (ds == null) return; if (ds.size() == 0) return; mds.clear(); mds.addAll(0, ds); notifyDataSetChanged(); } public void initMData(D d) { if (d == null) return; mds.add(d); notifyDataSetChanged(); } public void initMDataToOne(D d) { if (d == null) return; mds.add(0, d); notifyDataSetChanged(); } public void addDataModel(ArrayList ds) { if (ds == null || ds.size() == 0) return; mds.addAll(ds); notifyDataSetChanged(); } public void addStartDataModel(ArrayList ds) { if (ds == null || ds.size() == 0) return; mds.addAll(0, ds); notifyDataSetChanged(); } public void addDataModel(D d) { if (d == null) return; mds.add(d); notifyDataSetChanged(); } public void deleteMDatas() { mds.clear(); notifyDataSetChanged(); } @Override public int getItemCount() { return mds != null ? mds.size() : 0; } @Override public void onBindViewHolder(@NonNull VH holder, int position) { D d = mds.get(position); onBindDataViewHolder(holder, position, d); } protected abstract void onBindDataViewHolder(VH holder, int position, D d); } //初始化RecyclerView //设置LayouerManager //绑定Adapter mRecyclerView.setHasFixedSize(true); mRecyclerView.setLayoutManager(new GridLayoutManager(this, 4)); groupingAdapter = new GroupingAdapter(this); mRecyclerView.setAdapter(groupingAdapter);复制代码
# 多类型 Item 适配加载列表
如果数据不确定的情况下需要 自行组装 服务端返回的接口数据 不同类型的数据需要设置不同的 ItemViewType
/** * 设置Item 类型多样化条目 */ @Override public int getItemViewType(int position) { ArrayList mds = getMds(); if (mds != null && mds.size() > 0) { return mds.get(position).getItemType(); } else return super.getItemViewType(position); } /** * 根据viewType * 设置 ViewHolder 多样化条目 */ @Override protected RecyclerView.ViewHolder onCreateChildViewHolder(ViewGroup parent, int viewType) { if (viewType == RecycleViewItemData.TYPE_ZERO) return new IndicatorViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.indicator_item, parent, false)); if (viewType == RecycleViewItemData.TYPE_ONE) return new GroupingViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.grouping_item, parent, false)); return null; } /** * 如果layoutManager 是GridLayoutManager 需要实现 * setSpanSizeLookup() 接口 返回 spanSize */ @Override public void onAttachedToRecyclerView(@NonNull final RecyclerView recyclerView) { super.onAttachedToRecyclerView(recyclerView); RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager(); if (layoutManager instanceof GridLayoutManager) { final GridLayoutManager gridManager = (GridLayoutManager) layoutManager; gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() { @Override public int getSpanSize(int position) { if (getItemViewType(position) == RecycleViewItemData.TYPE_ONE) return 1; else return 4; } }); } }复制代码 # 方法1：
利用多Item 类型 将数据泛型多样化
# 方法2：
在 getItemCount() 方法返回 多于展示列表的 position 0 header itemDatas.size()+1 footer
@Override public int getItemCount() { return mds != null ? mds.size() : 0; } @Override public int getItemCount() { return mds != null ? mds.size()+1 : 0; // header } @Override public int getItemCount() { return mds != null ? mds.size()+2 : 0; // header footer }复制代码 # header fooder 适配加载列表
# 上拉加载更多 下拉刷新
添加Header 或者 fooder 和多Item 展示属于一个套路 下来刷新 上啦加载更多 需要预先加载 RefreshHeader FooderHeader 重写RecyclerView 的touch 事件 监听 RecyclerView ScrollChange
下面是牛逼闪闪的XRecyclerView ↓↓↓↓↓↓↓↓↓↓↓↓↓
# XRecyclerView
- 下拉刷新 上拉加载 封装 自定义Refresh View
- 添加 Header Footer
- 拖动排序的接口封装
- 等等
@Override public void onScrollStateChanged(int state) { super.onScrollStateChanged(state); if (state == RecyclerView.SCROLL_STATE_IDLE && mLoadingListener != null && !isLoadingData && loadingMoreEnabled) { LayoutManager layoutManager = getLayoutManager(); int lastVisibleItemPosition; //最后item 的未知 if (layoutManager instanceof GridLayoutManager) { lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition(); } else if (layoutManager instanceof StaggeredGridLayoutManager) { int[] into = new int[((StaggeredGridLayoutManager) layoutManager).getSpanCount()]; ((StaggeredGridLayoutManager) layoutManager).findLastVisibleItemPositions(into); lastVisibleItemPosition = findMax(into); } else { lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition(); } int adjAdapterItemCount = layoutManager.getItemCount() + getHeaders_includingRefreshCount(); if ( layoutManager.getChildCount() > 0 && lastVisibleItemPosition >= adjAdapterItemCount - limitNumberToCallLoadMore && adjAdapterItemCount >= layoutManager.getChildCount() && !isNoMore && mRefreshHeader.getState() < ArrowRefreshHeader.STATE_REFRESHING ) { //是否是最后一位Item isLoadingData = true; if (mFootView instanceof LoadingMoreFooter) { ((LoadingMoreFooter) mFootView).setState(LoadingMoreFooter.STATE_LOADING); } else { if (footerViewCallBack != null) { footerViewCallBack.onLoadingMore(mFootView); } } //调用接口 返回事件 mLoadingListener.onLoadMore(); } } } @Override public boolean onTouchEvent(MotionEvent ev) { if (mLastY == -1) { mLastY = ev.getRawY(); } switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: mLastY = ev.getRawY(); break; case MotionEvent.ACTION_MOVE: final float deltaY = ev.getRawY() - mLastY; mLastY = ev.getRawY(); if (isOnTop() && pullRefreshEnabled && appbarState == AppBarStateChangeListener.State.EXPANDED) { mRefreshHeader.onMove(deltaY / DRAG_RATE); if (mRefreshHeader.getVisibleHeight() > 0 && mRefreshHeader.getState() < ArrowRefreshHeader.STATE_REFRESHING) { return false; } } break; default: mLastY = -1; // reset if (isOnTop() && pullRefreshEnabled && appbarState == AppBarStateChangeListener.State.EXPANDED) { if (mRefreshHeader.releaseAction()) { if (mLoadingListener != null) { mLoadingListener.onRefresh(); } } } break; } return super.onTouchEvent(ev); }复制代码 更多详情->
# 分组折叠 列表
待续。。。
# 分组 悬浮列表
待续。。。
# 拖拽排序
待续。。。
# 侧滑 展开Menu 菜单
- 实现RecyclerView OnItemTouchListener 接口 获取 Item 的 Touch 事件
/** * An OnItemTouchListener allows the application to intercept touch events in progress at the * view hierarchy level of the RecyclerView before those touch events are considered for * RecyclerView's own scrolling behavior. * *This can be useful for applications that wish to implement various forms of gestural * manipulation of item views within the RecyclerView. OnItemTouchListeners may intercept * a touch interaction already in progress even if the RecyclerView is already handling that * gesture stream itself for the purposes of scrolling.
* * @see SimpleOnItemTouchListener */ public interface OnItemTouchListener { /** * Silently observe and/or take over touch events sent to the RecyclerView * before they are handled by either the RecyclerView itself or its child views. * *The onInterceptTouchEvent methods of each attached OnItemTouchListener will be run * in the order in which each listener was added, before any other touch processing * by the RecyclerView itself or child views occurs.
* * @param e MotionEvent describing the touch event. All coordinates are in * the RecyclerView's coordinate system. * @return true if this OnItemTouchListener wishes to begin intercepting touch events, false * to continue with the current behavior and continue observing future events in * the gesture. */ boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e); /** * Process a touch event as part of a gesture that was claimed by returning true from * a previous call to { @link #onInterceptTouchEvent}. * * @param e MotionEvent describing the touch event. All coordinates are in * the RecyclerView's coordinate system. */ void onTouchEvent(RecyclerView rv, MotionEvent e); /** * Called when a child of RecyclerView does not want RecyclerView and its ancestors to * intercept touch events with * { @link ViewGroup#onInterceptTouchEvent(MotionEvent)}. * * @param disallowIntercept True if the child does not want the parent to * intercept touch events. * @see ViewParent#requestDisallowInterceptTouchEvent(boolean) */ void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept); }复制代码
- 实现接口
public static class OnSwipeItemTouchListener implements RecyclerView.OnItemTouchListener { private SwipeItemLayout mCaptureItem; private float mLastMotionX; private float mLastMotionY; private VelocityTracker mVelocityTracker; private int mActivePointerId; private int mTouchSlop; private int mMaximumVelocity; private boolean mDealByParent; private boolean mIsProbeParent; public OnSwipeItemTouchListener(Context context) { ViewConfiguration configuration = ViewConfiguration.get(context); mTouchSlop = configuration.getScaledTouchSlop(); mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); mActivePointerId = -1; mDealByParent = false; mIsProbeParent = false; } @Override public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent ev) { if (mIsProbeParent) return false; boolean intercept = false; final int action = ev.getActionMasked(); if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } mVelocityTracker.addMovement(ev); switch (action) { case MotionEvent.ACTION_DOWN: { mActivePointerId = ev.getPointerId(0); final float x = ev.getX(); final float y = ev.getY(); mLastMotionX = x; mLastMotionY = y; boolean pointOther = false; SwipeItemLayout pointItem = null; //首先知道ev针对的是哪个item View pointView = findTopChildUnder(rv, (int) x, (int) y); if (pointView == null || !(pointView instanceof SwipeItemLayout)) { //可能是head view或bottom view pointOther = true; } else pointItem = (SwipeItemLayout) pointView; //此时的pointOther=true，意味着点击的view为空或者点击的不是item //还没有把点击的是item但是不是capture item给过滤出来 if (!pointOther && (mCaptureItem == null || mCaptureItem != pointItem)) pointOther = true; //点击的是capture item if (!pointOther) { Mode touchMode = mCaptureItem.getTouchMode(); //如果它在fling，就转为drag //需要拦截，并且requestDisallowInterceptTouchEvent boolean disallowIntercept = false; if (touchMode == Mode.FLING) { mCaptureItem.setTouchMode(Mode.DRAG); disallowIntercept = true; intercept = true; } else { //如果是expand的，就不允许parent拦截 mCaptureItem.setTouchMode(Mode.TAP); if (mCaptureItem.isOpen()) disallowIntercept = true; } if (disallowIntercept) { final ViewParent parent = rv.getParent(); if (parent != null) parent.requestDisallowInterceptTouchEvent(true); } } else { //capture item为null或者与point item不一样 //直接将其close掉 if (mCaptureItem != null && mCaptureItem.isOpen()) { mCaptureItem.close(); mCaptureItem = null; intercept = true; } if (pointItem != null) { mCaptureItem = pointItem; mCaptureItem.setTouchMode(Mode.TAP); } else mCaptureItem = null; } //如果parent处于fling状态，此时，parent就会转为drag。此时，应该将后续move都交给parent处理 mIsProbeParent = true; mDealByParent = rv.onInterceptTouchEvent(ev); mIsProbeParent = false; if (mDealByParent) intercept = false; break; } case MotionEvent.ACTION_POINTER_DOWN: { final int actionIndex = ev.getActionIndex(); mActivePointerId = ev.getPointerId(actionIndex); mLastMotionX = ev.getX(actionIndex); mLastMotionY = ev.getY(actionIndex); break; } case MotionEvent.ACTION_POINTER_UP: { final int actionIndex = ev.getActionIndex(); final int pointerId = ev.getPointerId(actionIndex); if (pointerId == mActivePointerId) { final int newIndex = actionIndex == 0 ? 1 : 0; mActivePointerId = ev.getPointerId(newIndex); mLastMotionX = ev.getX(newIndex); mLastMotionY = ev.getY(newIndex); } break; } //down时，已经将capture item定下来了。所以，后面可以安心考虑event处理 case MotionEvent.ACTION_MOVE: { final int activePointerIndex = ev.findPointerIndex(mActivePointerId); if (activePointerIndex == -1) break; //在down时，就被认定为parent的drag，所以，直接交给parent处理即可 if (mDealByParent) { if (mCaptureItem != null && mCaptureItem.isOpen()) mCaptureItem.close(); return false; } final int x = (int) (ev.getX(activePointerIndex) + .5f); final int y = (int) ((int) ev.getY(activePointerIndex) + .5f); int deltaX = (int) (x - mLastMotionX); int deltaY = (int) (y - mLastMotionY); final int xDiff = Math.abs(deltaX); final int yDiff = Math.abs(deltaY); if (mCaptureItem != null && !mDealByParent) { Mode touchMode = mCaptureItem.getTouchMode(); if (touchMode == Mode.TAP) { //如果capture item是open的，下拉有两种处理方式： // 1、下拉后，直接close item // 2、只要是open的，就拦截所有它的消息，这样如果点击open的，就只能滑动该capture item //网易邮箱，在open的情况下，下拉直接close //QQ，在open的情况下，下拉也是close。但是，做的不够好，没有达到该效果。 if (xDiff > mTouchSlop && xDiff > yDiff) { mCaptureItem.setTouchMode(Mode.DRAG); final ViewParent parent = rv.getParent(); parent.requestDisallowInterceptTouchEvent(true); deltaX = deltaX > 0 ? deltaX - mTouchSlop : deltaX + mTouchSlop; } else { // if(yDiff>mTouchSlop){ mIsProbeParent = true; boolean isParentConsume = rv.onInterceptTouchEvent(ev); mIsProbeParent = false; if (isParentConsume) { //表明不是水平滑动，即不判定为SwipeItemLayout的滑动 //但是，可能是下拉刷新SwipeRefreshLayout或者RecyclerView的滑动 //一般的下拉判定，都是yDiff>mTouchSlop，所以，此处这么写不会出问题 //这里这么做以后，如果判定为下拉，就直接close mDealByParent = true; mCaptureItem.close(); } } } touchMode = mCaptureItem.getTouchMode(); if (touchMode == Mode.DRAG) { intercept = true; mLastMotionX = x; mLastMotionY = y; //对capture item进行拖拽 mCaptureItem.trackMotionScroll(deltaX); } } break; } case MotionEvent.ACTION_UP: if (mCaptureItem != null) { Mode touchMode = mCaptureItem.getTouchMode(); if (touchMode == Mode.DRAG) { final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); int xVel = (int) velocityTracker.getXVelocity(mActivePointerId); mCaptureItem.fling(xVel); intercept = true; } } cancel(); break; case MotionEvent.ACTION_CANCEL: if (mCaptureItem != null) mCaptureItem.revise(); cancel(); break; } return intercept; } @Override public void onTouchEvent(RecyclerView rv, MotionEvent ev) { final int action = ev.getActionMasked(); final int actionIndex = ev.getActionIndex(); if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } mVelocityTracker.addMovement(ev); switch (action) { case MotionEvent.ACTION_POINTER_DOWN: mActivePointerId = ev.getPointerId(actionIndex); mLastMotionX = ev.getX(actionIndex); mLastMotionY = ev.getY(actionIndex); break; case MotionEvent.ACTION_POINTER_UP: final int pointerId = ev.getPointerId(actionIndex); if (pointerId == mActivePointerId) { final int newIndex = actionIndex == 0 ? 1 : 0; mActivePointerId = ev.getPointerId(newIndex); mLastMotionX = ev.getX(newIndex); mLastMotionY = ev.getY(newIndex); } break; //down时，已经将capture item定下来了。所以，后面可以安心考虑event处理 case MotionEvent.ACTION_MOVE: { final int activePointerIndex = ev.findPointerIndex(mActivePointerId); if (activePointerIndex == -1) break; final float x = ev.getX(activePointerIndex); final float y = (int) ev.getY(activePointerIndex); int deltaX = (int) (x - mLastMotionX); if (mCaptureItem != null && mCaptureItem.getTouchMode() == Mode.DRAG) { mLastMotionX = x; mLastMotionY = y; //对capture item进行拖拽 mCaptureItem.trackMotionScroll(deltaX); } break; } case MotionEvent.ACTION_UP: if (mCaptureItem != null) { Mode touchMode = mCaptureItem.getTouchMode(); if (touchMode == Mode.DRAG) { final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); int xVel = (int) velocityTracker.getXVelocity(mActivePointerId); mCaptureItem.fling(xVel); } } cancel(); break; case MotionEvent.ACTION_CANCEL: if (mCaptureItem != null) mCaptureItem.revise(); cancel(); break; } } @Override public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { } void cancel() { mDealByParent = false; mActivePointerId = -1; if (mVelocityTracker != null) { mVelocityTracker.recycle(); mVelocityTracker = null; } } }复制代码 - SwipeItemLayout
author:liyi
/** * Author： liyi * Date：2017/2/16. * description: 侧滑 菜单 */public class SwipeItemLayout extends ViewGroup { enum Mode { RESET, DRAG, FLING, TAP } private Mode mTouchMode; private ViewGroup mMainView; private ViewGroup mSideView; private ScrollRunnable mScrollRunnable; private int mScrollOffset; private int mMaxScrollOffset; private boolean mInLayout; private boolean mIsLaidOut; public SwipeItemLayout(Context context) { this(context, null); } public SwipeItemLayout(Context context, AttributeSet attrs) { super(context, attrs); mTouchMode = Mode.RESET; mScrollOffset = 0; mIsLaidOut = false; mScrollRunnable = new ScrollRunnable(context); } public boolean isOpen() { return mScrollOffset != 0; } Mode getTouchMode() { return mTouchMode; } void setTouchMode(Mode mode) { switch (mTouchMode) { case FLING: mScrollRunnable.abort(); break; case RESET: break; } mTouchMode = mode; } public void open() { if (mScrollOffset != -mMaxScrollOffset) { //正在open，不需要处理 if (mTouchMode == Mode.FLING && mScrollRunnable.isScrollToLeft()) return; //当前正在向右滑，abort if (mTouchMode == Mode.FLING /*&& !mScrollRunnable.mScrollToLeft*/) mScrollRunnable.abort(); mScrollRunnable.startScroll(mScrollOffset, -mMaxScrollOffset); } } public void close() { if (mScrollOffset != 0) { //正在close，不需要处理 if (mTouchMode == Mode.FLING && !mScrollRunnable.isScrollToLeft()) return; //当前正向左滑，abort if (mTouchMode == Mode.FLING /*&& mScrollRunnable.mScrollToLeft*/) mScrollRunnable.abort(); mScrollRunnable.startScroll(mScrollOffset, 0); } } void fling(int xVel) { mScrollRunnable.startFling(mScrollOffset, xVel); } void revise() { if (mScrollOffset < -mMaxScrollOffset / 2) open(); else close(); } boolean trackMotionScroll(int deltaX) { if (deltaX == 0) return false; boolean over = false; int newLeft = mScrollOffset + deltaX; if ((deltaX > 0 && newLeft > 0) || (deltaX < 0 && newLeft < -mMaxScrollOffset)) { over = true; newLeft = Math.min(newLeft, 0); newLeft = Math.max(newLeft, -mMaxScrollOffset); } offsetChildrenLeftAndRight(newLeft - mScrollOffset); mScrollOffset = newLeft; return over; } private boolean ensureChildren() { int childCount = getChildCount(); if (childCount != 2) return false; View childView = getChildAt(0); if (!(childView instanceof ViewGroup)) return false; mMainView = (ViewGroup) childView; childView = getChildAt(1); if (!(childView instanceof ViewGroup)) return false; mSideView = (ViewGroup) childView; return true; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (!ensureChildren()) throw new RuntimeException("SwipeItemLayout的子视图不符合规定"); int widthMode = MeasureSpec.getMode(widthMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); MarginLayoutParams lp = null; int horizontalMargin, verticalMargin; int horizontalPadding = getPaddingLeft() + getPaddingRight(); int verticalPadding = getPaddingTop() + getPaddingBottom(); lp = (MarginLayoutParams) mMainView.getLayoutParams(); horizontalMargin = lp.leftMargin + lp.rightMargin; verticalMargin = lp.topMargin + lp.bottomMargin; measureChildWithMargins(mMainView, widthMeasureSpec, horizontalMargin + horizontalPadding, heightMeasureSpec, verticalMargin + verticalPadding); if (widthMode == MeasureSpec.AT_MOST) widthSize = Math.min(widthSize, mMainView.getMeasuredWidth() + horizontalMargin + horizontalPadding); else if (widthMode == MeasureSpec.UNSPECIFIED) widthSize = mMainView.getMeasuredWidth() + horizontalMargin + horizontalPadding; if (heightMode == MeasureSpec.AT_MOST) heightSize = Math.min(heightSize, mMainView.getMeasuredHeight() + verticalMargin + verticalPadding); else if (heightMode == MeasureSpec.UNSPECIFIED) heightSize = mMainView.getMeasuredHeight() + verticalMargin + verticalPadding; setMeasuredDimension(widthSize, heightSize); //side layout大小为自身实际大小 lp = (MarginLayoutParams) mSideView.getLayoutParams(); verticalMargin = lp.topMargin + lp.bottomMargin; mSideView.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(getMeasuredHeight() - verticalMargin - verticalPadding, MeasureSpec.EXACTLY)); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { if (!ensureChildren()) throw new RuntimeException("SwipeItemLayout的子视图不符合规定"); mInLayout = true; int pl = getPaddingLeft(); int pt = getPaddingTop(); int pr = getPaddingRight(); int pb = getPaddingBottom(); MarginLayoutParams mainLp = (MarginLayoutParams) mMainView.getLayoutParams(); MarginLayoutParams sideParams = (MarginLayoutParams) mSideView.getLayoutParams(); int childLeft = pl + mainLp.leftMargin; int childTop = pt + mainLp.topMargin; int childRight = getWidth() - (pr + mainLp.rightMargin); int childBottom = getHeight() - (mainLp.bottomMargin + pb); mMainView.layout(childLeft, childTop, childRight, childBottom); childLeft = childRight + sideParams.leftMargin; childTop = pt + sideParams.topMargin; childRight = childLeft + sideParams.leftMargin + sideParams.rightMargin + mSideView.getMeasuredWidth(); childBottom = getHeight() - (sideParams.bottomMargin + pb); mSideView.layout(childLeft, childTop, childRight, childBottom); mMaxScrollOffset = mSideView.getWidth() + sideParams.leftMargin + sideParams.rightMargin; mScrollOffset = mScrollOffset < -mMaxScrollOffset / 2 ? -mMaxScrollOffset : 0; offsetChildrenLeftAndRight(mScrollOffset); mInLayout = false; mIsLaidOut = true; } void offsetChildrenLeftAndRight(int delta) { ViewCompat.offsetLeftAndRight(mMainView, delta); ViewCompat.offsetLeftAndRight(mSideView, delta); } @Override public void requestLayout() { if (!mInLayout) { super.requestLayout(); } } @Override protected LayoutParams generateDefaultLayoutParams() { return new MarginLayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); } @Override protected LayoutParams generateLayoutParams(LayoutParams p) { return p instanceof MarginLayoutParams ? p : new MarginLayoutParams(p); } @Override protected boolean checkLayoutParams(LayoutParams p) { return p instanceof MarginLayoutParams && super.checkLayoutParams(p); } @Override public LayoutParams generateLayoutParams(AttributeSet attrs) { return new MarginLayoutParams(getContext(), attrs); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); if (mScrollOffset != 0 && mIsLaidOut) { offsetChildrenLeftAndRight(-mScrollOffset); mScrollOffset = 0; } else mScrollOffset = 0; } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); if (mScrollOffset != 0 && mIsLaidOut) { offsetChildrenLeftAndRight(-mScrollOffset); mScrollOffset = 0; } else mScrollOffset = 0; removeCallbacks(mScrollRunnable); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { final int action = ev.getActionMasked(); //click main view，但是它处于open状态，所以，不需要点击效果，直接拦截不调用click listener switch (action) { case MotionEvent.ACTION_DOWN: { final int x = (int) ev.getX(); final int y = (int) ev.getY(); View pointView = findTopChildUnder(this, x, y); if (pointView != null && pointView == mMainView && mScrollOffset != 0) return true; break; } case MotionEvent.ACTION_MOVE: case MotionEvent.ACTION_CANCEL: break; case MotionEvent.ACTION_UP: { final int x = (int) ev.getX(); final int y = (int) ev.getY(); View pointView = findTopChildUnder(this, x, y); if (pointView != null && pointView == mMainView && mTouchMode == Mode.TAP && mScrollOffset != 0) return true; } } return false; } @Override public boolean onTouchEvent(MotionEvent ev) { final int action = ev.getActionMasked(); //click main view，但是它处于open状态，所以，不需要点击效果，直接拦截不调用click listener switch (action) { case MotionEvent.ACTION_DOWN: { final int x = (int) ev.getX(); final int y = (int) ev.getY(); View pointView = findTopChildUnder(this, x, y); if (pointView != null && pointView == mMainView && mScrollOffset != 0) return true; break; } case MotionEvent.ACTION_MOVE: case MotionEvent.ACTION_CANCEL: break; case MotionEvent.ACTION_UP: { final int x = (int) ev.getX(); final int y = (int) ev.getY(); View pointView = findTopChildUnder(this, x, y); if (pointView != null && pointView == mMainView && mTouchMode == Mode.TAP && mScrollOffset != 0) { close(); return true; } } } return false; } @Override protected void onVisibilityChanged(View changedView, int visibility) { super.onVisibilityChanged(changedView, visibility); if (getVisibility() != View.VISIBLE) { mScrollOffset = 0; invalidate(); } } private static final Interpolator sInterpolator = new Interpolator() { @Override public float getInterpolation(float t) { t -= 1.0f; return t * t * t * t * t + 1.0f; } }; class ScrollRunnable implements Runnable { private static final int FLING_DURATION = 200; private Scroller mScroller; private boolean mAbort; private int mMinVelocity; private boolean mScrollToLeft; ScrollRunnable(Context context) { mScroller = new Scroller(context, sInterpolator); mAbort = false; mScrollToLeft = false; ViewConfiguration configuration = ViewConfiguration.get(context); mMinVelocity = configuration.getScaledMinimumFlingVelocity(); } void startScroll(int startX, int endX) { if (startX != endX) { Log.e("scroll - startX - endX", "" + startX + " " + endX); setTouchMode(Mode.FLING); mAbort = false; mScrollToLeft = endX < startX; mScroller.startScroll(startX, 0, endX - startX, 0, 400); ViewCompat.postOnAnimation(SwipeItemLayout.this, this); } } void startFling(int startX, int xVel) { Log.e("fling - startX", "" + startX); if (xVel > mMinVelocity && startX != 0) { startScroll(startX, 0); return; } if (xVel < -mMinVelocity && startX != -mMaxScrollOffset) { startScroll(startX, -mMaxScrollOffset); return; } startScroll(startX, startX > -mMaxScrollOffset / 2 ? 0 : -mMaxScrollOffset); } void abort() { if (!mAbort) { mAbort = true; if (!mScroller.isFinished()) { mScroller.abortAnimation(); removeCallbacks(this); } } } //是否正在滑动需要另外判断 boolean isScrollToLeft() { return mScrollToLeft; } @Override public void run() { Log.e("abort", Boolean.toString(mAbort)); if (!mAbort) { boolean more = mScroller.computeScrollOffset(); int curX = mScroller.getCurrX(); Log.e("curX", "" + curX); boolean atEdge = trackMotionScroll(curX - mScrollOffset); if (more && !atEdge) { ViewCompat.postOnAnimation(SwipeItemLayout.this, this); return; } if (atEdge) { removeCallbacks(this); if (!mScroller.isFinished()) mScroller.abortAnimation(); setTouchMode(Mode.RESET); } if (!more) { setTouchMode(Mode.RESET); //绝对不会出现这种意外的！！！可以注释掉 if (mScrollOffset != 0) { if (Math.abs(mScrollOffset) > mMaxScrollOffset / 2) mScrollOffset = -mMaxScrollOffset; else mScrollOffset = 0; ViewCompat.postOnAnimation(SwipeItemLayout.this, this); } } } } } public static class OnSwipeItemTouchListener implements RecyclerView.OnItemTouchListener { private SwipeItemLayout mCaptureItem; private float mLastMotionX; private float mLastMotionY; private VelocityTracker mVelocityTracker; private int mActivePointerId; private int mTouchSlop; private int mMaximumVelocity; private boolean mDealByParent; private boolean mIsProbeParent; public OnSwipeItemTouchListener(Context context) { ViewConfiguration configuration = ViewConfiguration.get(context); mTouchSlop = configuration.getScaledTouchSlop(); mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); mActivePointerId = -1; mDealByParent = false; mIsProbeParent = false; } @Override public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent ev) { if (mIsProbeParent) return false; boolean intercept = false; final int action = ev.getActionMasked(); if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } mVelocityTracker.addMovement(ev); switch (action) { case MotionEvent.ACTION_DOWN: { mActivePointerId = ev.getPointerId(0); final float x = ev.getX(); final float y = ev.getY(); mLastMotionX = x; mLastMotionY = y; boolean pointOther = false; SwipeItemLayout pointItem = null; //首先知道ev针对的是哪个item View pointView = findTopChildUnder(rv, (int) x, (int) y); if (pointView == null || !(pointView instanceof SwipeItemLayout)) { //可能是head view或bottom view pointOther = true; } else pointItem = (SwipeItemLayout) pointView; //此时的pointOther=true，意味着点击的view为空或者点击的不是item //还没有把点击的是item但是不是capture item给过滤出来 if (!pointOther && (mCaptureItem == null || mCaptureItem != pointItem)) pointOther = true; //点击的是capture item if (!pointOther) { Mode touchMode = mCaptureItem.getTouchMode(); //如果它在fling，就转为drag //需要拦截，并且requestDisallowInterceptTouchEvent boolean disallowIntercept = false; if (touchMode == Mode.FLING) { mCaptureItem.setTouchMode(Mode.DRAG); disallowIntercept = true; intercept = true; } else { //如果是expand的，就不允许parent拦截 mCaptureItem.setTouchMode(Mode.TAP); if (mCaptureItem.isOpen()) disallowIntercept = true; } if (disallowIntercept) { final ViewParent parent = rv.getParent(); if (parent != null) parent.requestDisallowInterceptTouchEvent(true); } } else { //capture item为null或者与point item不一样 //直接将其close掉 if (mCaptureItem != null && mCaptureItem.isOpen()) { mCaptureItem.close(); mCaptureItem = null; intercept = true; } if (pointItem != null) { mCaptureItem = pointItem; mCaptureItem.setTouchMode(Mode.TAP); } else mCaptureItem = null; } //如果parent处于fling状态，此时，parent就会转为drag。此时，应该将后续move都交给parent处理 mIsProbeParent = true; mDealByParent = rv.onInterceptTouchEvent(ev); mIsProbeParent = false; if (mDealByParent) intercept = false; break; } case MotionEvent.ACTION_POINTER_DOWN: { final int actionIndex = ev.getActionIndex(); mActivePointerId = ev.getPointerId(actionIndex); mLastMotionX = ev.getX(actionIndex); mLastMotionY = ev.getY(actionIndex); break; } case MotionEvent.ACTION_POINTER_UP: { final int actionIndex = ev.getActionIndex(); final int pointerId = ev.getPointerId(actionIndex); if (pointerId == mActivePointerId) { final int newIndex = actionIndex == 0 ? 1 : 0; mActivePointerId = ev.getPointerId(newIndex); mLastMotionX = ev.getX(newIndex); mLastMotionY = ev.getY(newIndex); } break; } //down时，已经将capture item定下来了。所以，后面可以安心考虑event处理 case MotionEvent.ACTION_MOVE: { final int activePointerIndex = ev.findPointerIndex(mActivePointerId); if (activePointerIndex == -1) break; //在down时，就被认定为parent的drag，所以，直接交给parent处理即可 if (mDealByParent) { if (mCaptureItem != null && mCaptureItem.isOpen()) mCaptureItem.close(); return false; } final int x = (int) (ev.getX(activePointerIndex) + .5f); final int y = (int) ((int) ev.getY(activePointerIndex) + .5f); int deltaX = (int) (x - mLastMotionX); int deltaY = (int) (y - mLastMotionY); final int xDiff = Math.abs(deltaX); final int yDiff = Math.abs(deltaY); if (mCaptureItem != null && !mDealByParent) { Mode touchMode = mCaptureItem.getTouchMode(); if (touchMode == Mode.TAP) { //如果capture item是open的，下拉有两种处理方式： // 1、下拉后，直接close item // 2、只要是open的，就拦截所有它的消息，这样如果点击open的，就只能滑动该capture item //网易邮箱，在open的情况下，下拉直接close //QQ，在open的情况下，下拉也是close。但是，做的不够好，没有达到该效果。 if (xDiff > mTouchSlop && xDiff > yDiff) { mCaptureItem.setTouchMode(Mode.DRAG); final ViewParent parent = rv.getParent(); parent.requestDisallowInterceptTouchEvent(true); deltaX = deltaX > 0 ? deltaX - mTouchSlop : deltaX + mTouchSlop; } else { // if(yDiff>mTouchSlop){ mIsProbeParent = true; boolean isParentConsume = rv.onInterceptTouchEvent(ev); mIsProbeParent = false; if (isParentConsume) { //表明不是水平滑动，即不判定为SwipeItemLayout的滑动 //但是，可能是下拉刷新SwipeRefreshLayout或者RecyclerView的滑动 //一般的下拉判定，都是yDiff>mTouchSlop，所以，此处这么写不会出问题 //这里这么做以后，如果判定为下拉，就直接close mDealByParent = true; mCaptureItem.close(); } } } touchMode = mCaptureItem.getTouchMode(); if (touchMode == Mode.DRAG) { intercept = true; mLastMotionX = x; mLastMotionY = y; //对capture item进行拖拽 mCaptureItem.trackMotionScroll(deltaX); } } break; } case MotionEvent.ACTION_UP: if (mCaptureItem != null) { Mode touchMode = mCaptureItem.getTouchMode(); if (touchMode == Mode.DRAG) { final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); int xVel = (int) velocityTracker.getXVelocity(mActivePointerId); mCaptureItem.fling(xVel); intercept = true; } } cancel(); break; case MotionEvent.ACTION_CANCEL: if (mCaptureItem != null) mCaptureItem.revise(); cancel(); break; } return intercept; } @Override public void onTouchEvent(RecyclerView rv, MotionEvent ev) { final int action = ev.getActionMasked(); final int actionIndex = ev.getActionIndex(); if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } mVelocityTracker.addMovement(ev); switch (action) { case MotionEvent.ACTION_POINTER_DOWN: mActivePointerId = ev.getPointerId(actionIndex); mLastMotionX = ev.getX(actionIndex); mLastMotionY = ev.getY(actionIndex); break; case MotionEvent.ACTION_POINTER_UP: final int pointerId = ev.getPointerId(actionIndex); if (pointerId == mActivePointerId) { final int newIndex = actionIndex == 0 ? 1 : 0; mActivePointerId = ev.getPointerId(newIndex); mLastMotionX = ev.getX(newIndex); mLastMotionY = ev.getY(newIndex); } break; //down时，已经将capture item定下来了。所以，后面可以安心考虑event处理 case MotionEvent.ACTION_MOVE: { final int activePointerIndex = ev.findPointerIndex(mActivePointerId); if (activePointerIndex == -1) break; final float x = ev.getX(activePointerIndex); final float y = (int) ev.getY(activePointerIndex); int deltaX = (int) (x - mLastMotionX); if (mCaptureItem != null && mCaptureItem.getTouchMode() == Mode.DRAG) { mLastMotionX = x; mLastMotionY = y; //对capture item进行拖拽 mCaptureItem.trackMotionScroll(deltaX); } break; } case MotionEvent.ACTION_UP: if (mCaptureItem != null) { Mode touchMode = mCaptureItem.getTouchMode(); if (touchMode == Mode.DRAG) { final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); int xVel = (int) velocityTracker.getXVelocity(mActivePointerId); mCaptureItem.fling(xVel); } } cancel(); break; case MotionEvent.ACTION_CANCEL: if (mCaptureItem != null) mCaptureItem.revise(); cancel(); break; } } @Override public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { } void cancel() { mDealByParent = false; mActivePointerId = -1; if (mVelocityTracker != null) { mVelocityTracker.recycle(); mVelocityTracker = null; } } } static View findTopChildUnder(ViewGroup parent, int x, int y) { final int childCount = parent.getChildCount(); for (int i = childCount - 1; i >= 0; i--) { final View child = parent.getChildAt(i); if (x >= child.getLeft() && x < child.getRight() && y >= child.getTop() && y < child.getBottom()) { return child; } } return null; } public static void closeAllItems(RecyclerView recyclerView) { for (int i = 0; i < recyclerView.getChildCount(); i++) { View child = recyclerView.getChildAt(i); if (child instanceof SwipeItemLayout) { SwipeItemLayout swipeItemLayout = (SwipeItemLayout) child; if (swipeItemLayout.isOpen()) swipeItemLayout.close(); } } }}复制代码