@Override
    public boolean judgeIntercept(float curInterceptY, float lastInterceptY, boolean isHeaderShow, boolean isFooterShow, boolean allowLoadMore) {
         boolean intercept;

         int firstVisiblePos = layoutManager.findFirstVisibleItemPosition();
         View firstView = rv.getChildAt(firstVisiblePos);
         if (firstVisiblePos == 0 && firstView.getTop() == 0) {
             intercept = curInterceptY > lastInterceptY || isHeaderShow;
         } else {
             if (allowLoadMore && layoutManager.findLastVisibleItemPosition() == layoutManager.getItemCount() - 1) {
                 intercept = curInterceptY < lastInterceptY || isFooterShow;
             } else {
                 intercept = false;
             }
         }

         return intercept;
    }
 

 2.MotionEvent.ACTION_UP中也必須返回false，因為一組事件以ACTION_UP結尾，則ACTION_UP這個事件必定會經過FrameLayout.onTouchEvent(ev)，如果攔截了，則子View針對ACTION_UP需要處理的事情就無法完成。

 3.MotionEvent.ACTION_MOVE中根據實際情況判斷是否攔截。

    private float moveDis;

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        if (touchHelper != null) {
            float curTouchY = ev.getY();
            switch (ev.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    break;
                case MotionEvent.ACTION_MOVE:
                    moveDis = curTouchY - lastInterceptY;
                    if (Math.abs(moveDis) < touchSlop) {
                        break;
                    }
                    if (isRefreshing || isLoadMore) {
                        break;
                    }
                    moveDis = moveDis * kMoveFactor;

                    if (touchHelper.isContentSlideToTop()) {
                        updateHeaderMargin(moveDis);
                    } else if (touchHelper.isContentSlideToBottom()) {
                        updateFooterMargin(moveDis);
                    }
                    break;
                case MotionEvent.ACTION_UP:
                    if (moveDis > 0) {
                        if (touchHelper.isContentSlideToTop()) {
                            if (headerParams.topMargin < 0) {
                                scrollHeaderByAnimator(headerParams.topMargin, -headerHeight);
                                if (header != null) {
                                    header.onPullToRefresh(moveDis);
                                }
                            } else {
                                scrollHeaderByAnimator(headerParams.topMargin, 0);
                                if (header != null) {
                                    header.onRefreshing();
                                }
                                isRefreshing = true;
                                if (listener != null) {
                                    listener.onRefresh();
                                }
                            }
                        }
                    } else {
                        if (touchHelper.isContentSlideToBottom()) {
                            if (footerParams.topMargin > height - footerHeight) {
                                scrollFooterByAnimator(false, footerParams.topMargin, height);
                                if (footer != null) {
                                    footer.onPullToLoadMore(moveDis);
                                }
                            } else {
                                scrollFooterByAnimator(false, footerParams.topMargin, height - footerHeight);
                                if (footer != null) {
                                    footer.onLoadMore();
                                }
                                isLoadMore = true;
                                if (listener != null) {
                                    listener.onLoadMore();
                                }
                            }
                        }
                    }
                    break;
            }
        }
        return true;
    }
 

private void updateHeaderMargin(float moveDis) {
        moveDis = moveDis < 0 ? 0 : moveDis;
        headerParams.topMargin = (int) (-headerHeight + moveDis);
        headerVG.setLayoutParams(headerParams);

        setChildViewTopMargin((int) moveDis);

        if (header != null) {
            if (moveDis < headerHeight) {
                header.onPullToRefresh(moveDis);
            } else {
                header.onReleaseToRefresh(moveDis);
            }
        }
    }

    private void setChildViewTopMargin(int topMargin) {
        LayoutParams childParams = (LayoutParams) childView.getLayoutParams();
        childParams.topMargin = topMargin;
        childView.setLayoutParams(childParams);
    }

    private void updateFooterMargin(float moveDis) {
        moveDis = moveDis > 0 ? 0 : moveDis;
        footerParams.topMargin = (int) (height + moveDis);
        footerVG.setLayoutParams(footerParams);

        setChildViewBottomMargin((int) Math.abs(moveDis));
        scrollContentToBottom((int) -moveDis);

        if (footer != null) {
            if (Math.abs(moveDis) < footerHeight) {
                footer.onPullToLoadMore(moveDis);
            } else {
                footer.onReleaseToLoadMore(moveDis);
            }
        }
    }

    private void setChildViewBottomMargin(int bottomMargin) {
        LayoutParams childParams = (LayoutParams) childView.getLayoutParams();
        childParams.bottomMargin = bottomMargin;
        childView.setLayoutParams(childParams);
    }

    private void scrollContentToBottom(int deltaY) {
        if (childView instanceof RecyclerView) {
            childView.scrollBy(0, deltaY);
        } else if (childView instanceof ListView) {
            ((ListView) childView).smoothScrollBy(deltaY, 0);
        } else if (childView instanceof ScrollView) {
            childView.scrollBy(0, deltaY);
        }
    }

    private void scrollHeaderByAnimator(float startY, float endY) {
        ValueAnimator animator = ValueAnimator.ofFloat(startY, endY);
        animator.setDuration(kDuration);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float floatValue = (float) animation.getAnimatedValue();
                headerParams.topMargin = (int) floatValue;
                headerVG.setLayoutParams(headerParams);

                setChildViewTopMargin((int) (headerHeight + floatValue));
            }
        });
        animator.start();
    }

    private void scrollFooterByAnimator(final boolean isAuto, float startY, float endY) {
        ValueAnimator animator = ValueAnimator.ofFloat(startY, endY);
        animator.setDuration(kDuration);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float floatValue = (float) animation.getAnimatedValue();
                footerParams.topMargin = (int) floatValue;
                footerVG.setLayoutParams(footerParams);

                int bottomMargin = (int) (height - floatValue);
                setChildViewBottomMargin(bottomMargin);
                if (isAuto) {
                    scrollContentToBottom(bottomMargin);
                    if (footer != null) {
                        footer.onPullToLoadMore(bottomMargin);
                        if (bottomMargin == footerHeight) {
                            footer.onLoadMore();
                        }
                    }
                }
            }
        });
        animator.start();
    }
 

不完善點還待指正！！！