使用一个 RecyclerView 实现了一个类似 Tab 效果,当这个 Tab 可以滑动时,显示最右侧的三角按钮,否则隐藏这个按钮。效果如图
final boolean canScrollHorizontally = mLayout.canScrollHorizontally(); final boolean canScrollVertically...= mLayout.canScrollVertically(); if (mVelocityTracker == null) { mVelocityTracker...nestedScrollAxis |= ViewCompat.SCROLL_AXIS_HORIZONTAL; } if (canScrollVertically...-1 : 1); startScroll = true; } if (canScrollVertically...canScrollHorizontally() && Math.abs(dx) > mTouchSlop) && (getLayoutManager().canScrollVertically
final boolean canScrollHorizontally = mLayout.canScrollHorizontally(); final boolean canScrollVertically...= mLayout.canScrollVertically(); ......final boolean canScrollHorizontally = mLayout.canScrollHorizontally(); final boolean canScrollVertically...= mLayout.canScrollVertically(); ......dx : 0, canScrollVertically ?
canScrollHorizontally) { nestedScrollAxis |= ViewCompat.SCROLL_AXIS_HORIZONTAL; } if (canScrollVertically...+= mTouchSlop; } startScroll = true; } if (canScrollVertically...dx : 0, canScrollVertically ?
滚动到边界时,如何拦截处理滑动 松手后如何处理后续的动效 如何判断滚动边界 首先来看第一个问题,如何知道上面或者下面的View滚动到了边界,其实Android源码中有个类ViewCompat,它有个函数canScrollVertically...view.getBottom() - view.getTop()); } 之后我们可以利用该函数对View进行递归遍历,判断最上层的ViewGroup是否可以上下滑动 private boolean canScrollVertically...isTransformedTouchPointInView(ev, view)) { return false; } if (ViewCompat.canScrollVertically...ViewGroup) view; for (int i = 0; i < vGroup.getChildCount(); i++) { if (canScrollVertically
pagerSnapHelper.attachToRecyclerView(view); super.onAttachedToWindow(view); } @Override public boolean canScrollVertically...() { return super.canScrollVertically(); } @Override public int scrollVerticallyBy(int dy,
= mLayout.canScrollVertically(); if (mVelocityTracker == null) { mVelocityTracker...dx : 0, canScrollVertically ?...dx : 0, canScrollVertically ?...-mVelocityTracker.getXVelocity(mScrollPointerId) : 0; final float yvel = canScrollVertically...dx : 0, canScrollVertically ?
getLocationOnScreen(location) when (orientation) { "d" -> if (canScrollVertically...> parent.requestDisallowInterceptTouchEvent(false) "r" -> { if (canScrollVertically...parent.requestDisallowInterceptTouchEvent(false) } } "l" -> { if (canScrollVertically
return view.getScrollY() > 0; } } else { return view.canScrollVertically...return realView.getScrollY() > 0; } } else { return ViewCompat.canScrollVertically...ViewCompat.canScrollVertically(realView, -1); } } @Override
val canScrollHorizontally = canScrollHorizontally(-1) || canScrollHorizontally(1) val canScrollVertically...= canScrollVertically(-1) || canScrollVertically(1) if (canScrollHorizontally || canScrollVertically
mChildList.canScrollVertically(dy)) { //正在loading的时候不要响应上滑事件...= null && mChildList.canScrollVertically(dy)) { consumed[1] = dy;...mChildList.canScrollVertically(dy)) { consumed[1] = dy; scrollBy
.getTop() < absListView.getPaddingTop()); } else { return ViewCompat.canScrollVertically...(mTarget, -1) || mTarget.getScrollY() > 0; } } else { return ViewCompat.canScrollVertically...return mScrollableChild.getScrollY() > 0; } } else { return ViewCompat.canScrollVertically
getHeightMode(), getPaddingTop() + getPaddingBottom() + heightUsed, lp.height, canScrollVertically
然后代码如下: recyclerView.setLayoutManager(new LinearLayoutManager(this){ @Override public boolean canScrollVertically
e.printStackTrace(); } finally { } } @Override public boolean canScrollVertically...getActivity(), LinearLayoutManager.VERTICAL, false) { @Override public boolean canScrollVertically
dx : 0, canScrollVertically ?...ViewCompat.canScrollVertically(target, -1); if (hiddenTop || showTop) { scrollBy(
手指向下滑动(内容向上滑动) * @return */ private boolean canScrollingUp() { if (ViewCompat.canScrollVertically...手指向上滑动(内容向下滑动) * @return */ private boolean canScrollingDown() { if (ViewCompat.canScrollVertically
) { return canScrollHorizon && super.canScrollHorizontally(); } @Override public boolean canScrollVertically...() { return canScrollVertical && super.canScrollVertically(); } } 滑动时只滑动一页类似viewPage mPagerSnapHelper
方法2:kesanRv.setLayoutManager(new LinearLayoutManager(getActivity()) { @Override public boolean canScrollVertically
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