第二篇：横纵向RecyclerView嵌套斜向滑动，列表会上下抖动

PS：

//加上这一句可以让横向的RecyclerVIew实现ViewPager的效果
PagerSnapHelper pagerSnapHelper = new PagerSnapHelper();
pagerSnapHelper.attachToRecyclerView(mRvList);

//内层RecyclerView
public class KidRecyclerView extends RecyclerView {

    private static final int INVALID_POINTER = -1;
    private int mScrollPointerId = INVALID_POINTER;
    private int mInitialTouchX, mInitialTouchY;
    private int mTouchSlop;

    public KidRecyclerView(Context context) {
        this(context, null);
    }

    public KidRecyclerView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public KidRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        ViewConfiguration vc = ViewConfiguration.get(getContext());
        mTouchSlop = vc.getScaledTouchSlop();
    }

 @Override
    public boolean onInterceptTouchEvent(MotionEvent e) {
        final int action = e.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mScrollPointerId = e.getPointerId(0);
                mInitialTouchX = (int) (e.getX());
                mInitialTouchY = (int) (e.getY());
                return super.onInterceptTouchEvent(e);
            case MotionEvent.ACTION_MOVE: {
                final int index = e.findPointerIndex(mScrollPointerId);
                if (index < 0) {
                    return false;
                }
                final int x = (int) (e.getX(index));
                final int y = (int) (e.getY(index));
                if (getScrollState() != SCROLL_STATE_DRAGGING) {
                    final int dx = x - mInitialTouchX;
                    final int dy = y - mInitialTouchY;
                    final boolean canScrollHorizontally = getLayoutManager().canScrollHorizontally();
                    final boolean canScrollVertically = getLayoutManager().canScrollVertically();
                    boolean startScroll = false;
                    if (canScrollHorizontally && Math.abs(dx) > mTouchSlop && (Math.abs(dx) >= Math.abs(dy) || canScrollVertically)) {
                        startScroll = true;
                    }
                    if (canScrollVertically && Math.abs(dy) > mTouchSlop && (Math.abs(dy) >= Math.abs(dx) || canScrollHorizontally)) {
                        startScroll = true;
                    }
                    return startScroll && super.onInterceptTouchEvent(e);
                }
                return super.onInterceptTouchEvent(e);
            }

            default:
                return super.onInterceptTouchEvent(e);
        }
    }
}

//外层RecyclerView
public class FatherRecyclerView extends BetterRecyclerView {

    public FatherRecyclerView(Context context) {
        this(context, null);
    }

    public FatherRecyclerView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public FatherRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
        //这里什么都不做
    }
}