RecycleView彈性滑動

還有點bug，建議使用 LinearSnapHelper

  rvPilotList.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);

//                offsetY += dy;
//
//                int first = linearLayoutManager.findFirstCompletelyVisibleItemPosition();
//                int last = linearLayoutManager.findLastCompletelyVisibleItemPosition();
//                View firstview = linearLayoutManager.findViewByPosition(first);
//                if (viewWidth == 0) {
//                    viewWidth = firstview.getHeight();
//                }
//                int offseta = firstview.getTop();
//                float sx = 1f + (float) offseta / viewWidth;
//                if (offsetY == 0) {
//                    View view = linearLayoutManager.findViewByPosition(first + 1);
//                    scaleUp(view);
//                }
//
//                firstview.setScaleX(sx);
//                View lastview = linearLayoutManager.findViewByPosition(last);
//                offseta = recyclerView.getHeight() - lastview.getBottom();
//                sx = 1f + (float) offseta / viewWidth;
//                lastview.setScaleX(sx);

            }

            @Override
            public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if (newState == 0) {
                    int visibleItem = linearLayoutManager.getChildCount();
                    int coun = 0;
                    if (visibleItem % 2 == 1) {
                        coun = (visibleItem - 1) / 2;
                    } else {
                        coun = visibleItem / 2;
                    }
                    Log.i(TAG, "onScrollStateChanged: " + visibleItem);
                    Log.i(TAG, "onScrollStateChanged: coun" + coun);
                    int postion = linearLayoutManager.findFirstVisibleItemPosition();
                    Log.i(TAG, "onScrollStateChanged: postion" + postion);
                    View view;
                    Log.i(TAG, "findFirstCompletelyVisibleItemPosition: " + linearLayoutManager.findFirstCompletelyVisibleItemPosition());
                    if (postion == 0 && linearLayoutManager.findFirstCompletelyVisibleItemPosition() != 0) {
                        view = linearLayoutManager.findViewByPosition(0);
                    } else {
                        view = linearLayoutManager.findViewByPosition(postion + coun);
                    }
                    int pm = ((ViewGroup) view.getParent()).getMeasuredWidth();
                    int left = view.getLeft() + view.getWidth() / 2;

                    int offset = 0;
                    if (left == pm / 2) {
                        return;
                    }
                    if (left < pm / 2) {
                        offset = -(pm / 2 - left);
                    } else {
                        offset = left - pm / 2;
                    }
                    rvPilotList.smoothScrollBy(offset, 0);
                }
            }
        });