android AppBarLayout 结合ViewPager

特别说明 只是为了记录自己遇到的问题

前段时间做项目 用到AppBarLayout 咔嚓咔嚓一顿写，写完了 测试说你这个加载更多数据时 数据没有连在一块（一页15条加载更多时显示18或者20条以后的数据）后来网上查询 滑动冲突 可是查询的都是数据抖动 可能是自己查询的姿势不对，过段时间领导说必须改可是自己在忙新的东西，于是同时一顿搜索 实验 最后成了。
自己贴下代码 让自己记住

public class FixAppBarLayoutBehavior extends AppBarLayout.Behavior {
private OverScroller mScroller;

public FixAppBarLayoutBehavior() {
    super();
}

public FixAppBarLayoutBehavior(Context context, AttributeSet attrs) {
    super(context, attrs);
}

@Override
public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child, MotionEvent ev) {
    if (ev.getAction() == MotionEvent.ACTION_DOWN) {
        Object scroller = getSuperSuperField(this, "mScroller");
        if (scroller != null && scroller instanceof OverScroller) {
            OverScroller overScroller = (OverScroller) scroller;
            overScroller.abortAnimation();
        }
    }

    return super.onInterceptTouchEvent(parent, child, ev);
}

private Object getSuperSuperField(Object paramClass, String paramString) {
    Field field = null;
    Object object = null;
    try {
        field = paramClass.getClass().getSuperclass().getSuperclass().getDeclaredField(paramString);
        field.setAccessible(true);
        object = field.get(paramClass);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return object;
}

//fling上滑appbar然后迅速fling下滑recycler时, HeaderBehavior的mScroller并未停止, 会导致上下来回晃动
@Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target,
                           int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int type) {
    super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed,
            dxUnconsumed, dyUnconsumed, type);
    stopNestedScrollIfNeeded(dyUnconsumed, child, target, type);
}

@Override
public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child,
                              View target, int dx, int dy, int[] consumed, int type) {
    super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type);
    stopNestedScrollIfNeeded(dy, child, target, type);
}

private void stopNestedScrollIfNeeded(int dy, AppBarLayout child, View target, int type) {
    if (type == ViewCompat.TYPE_NON_TOUCH) {
        final int currOffset = getTopAndBottomOffset();
        if ((dy < 0 && currOffset == 0)
                || (dy > 0 && currOffset == -child.getTotalScrollRange())) {
            ViewCompat.stopNestedScroll(target, ViewCompat.TYPE_NON_TOUCH);
        }
    }
}

}