横向的recyclerView 嵌套了多个竖向的recyclerView，怎么让他们同时响应两根手指的滑动时间

要让横向的RecyclerView和嵌套的竖向的RecyclerView都能响应两根手指的滑动事件，可以在横向的RecyclerView的`onInterceptTouchEvent()`方法中判断如果是两根手指的滑动事件，则让竖向的RecyclerView也能接收到事件。

具体实现如下：

public class HorizontalRecyclerView extends RecyclerView {
    private boolean mIsScrolling;
    private int mActivePointerId = INVALID_POINTER_ID;
    private float mLastTouchX;
    private float mLastTouchY;

    public HorizontalRecyclerView(Context context) {
        super(context);
    }

    public HorizontalRecyclerView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

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

    @Override
    public boolean onInterceptTouchEvent(MotionEvent e) {
        final int action = MotionEventCompat.getActionMasked(e);

        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mActivePointerId = e.getPointerId(0);
                mLastTouchX = e.getX();
                mLastTouchY = e.getY();
                mIsScrolling = false;
                break;

            case MotionEvent.ACTION_POINTER_DOWN:
                mIsScrolling = true;
                break;

            case MotionEvent.ACTION_MOVE:
                if (!mIsScrolling) {
                    final int pointerIndex = e.findPointerIndex(mActivePointerId);
                    final float x = e.getX(pointerIndex);
                    final float y = e.getY(pointerIndex);

                    if (Math.abs(x - mLastTouchX) > Math.abs(y - mLastTouchY)) {
                        // 横向滑动
                        return super.onInterceptTouchEvent(e);
                    } else {
                        // 竖向滑动
                        for (int i = 0; i < getChildCount(); i++) {
                            View child = getChildAt(i);
                            if (child instanceof RecyclerView) {
                                RecyclerView verticalRecyclerView = (RecyclerView) child;
                                verticalRecyclerView.onInterceptTouchEvent(e);
                            }
                        }
                        return false;
                    }
                }
                break;

            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                mActivePointerId = INVALID_POINTER_ID;
                mIsScrolling = false;
                break;
        }

        return super.onInterceptTouchEvent(e);
    }
}

这里重写了横向的RecyclerView的`onInterceptTouchEvent()`方法，当检测到手指数量为2时，就将事件传递给嵌套的竖向的RecyclerView处理。如果手指数量为1，则继续让横向的RecyclerView自己处理事件。