我现在用的是新CoordinatorLayout与AppBarLayout和CollapsingToolbarLayout。下面AppBarLayout，我有内容列表的RecyclerView。

I am using the new CoordinatorLayout with AppBarLayout and CollapsingToolbarLayout. Below AppBarLayout, I have a RecyclerView with a list of content.

我已经验证一扔就RecyclerView滚动的作品，当我上下滚动列表。不过，我也想在AppBarLayout扩张过程中平滑滚动。

I have verified that fling scrolling works on the RecyclerView when I am scrolling up and down the list. However, I would also like the AppBarLayout to smoothly scroll during expansion.

当向上滚动扩大CollaspingToolbarLayout，立即停止滚动，一旦抬起手指离开屏幕。如果你在一个快速移动向上滚动，有时CollapsingToolbarLayout再崩溃也是如此。这与RecyclerView行为似乎功能很多不同的使用NestedScrollView时比。

When scrolling up to expand the CollaspingToolbarLayout, scrolling immediately stops once lifting your finger off the screen. If you scroll up in a quick motion, sometimes the CollapsingToolbarLayout re-collapses as well. This behavior with the RecyclerView seems to function much differently than when using a NestedScrollView.

我试图设置在recyclerview不同的滚动属性，但我一直没能想出解决办法。

I've tried to set different scroll properties on the recyclerview but I haven't been able to figure this out.

下面是一个视频显示了一些滚动的问题。 https://youtu.be/xMLKoJOsTAM

Here is a video showing some of the scrolling issues. https://youtu.be/xMLKoJOsTAM

下面是一个例子，显示了问题的RecyclerView（CheeseDetailActivity）。 https://github.com/tylerjroach/cheesesquare

Here is an example showing the issue with the RecyclerView (CheeseDetailActivity). https://github.com/tylerjroach/cheesesquare

下面是一个使用由克里斯·巴内斯一个NestedScrollView最初的例子。 https://github.com/chrisbanes/cheesesquare

Here is the original example that uses a NestedScrollView from Chris Banes. https://github.com/chrisbanes/cheesesquare

推荐答案

Boyarshinov的答案几乎是正确的。

The answer of Kirill Boyarshinov was almost correct.

主要的问题是，RecyclerView有时是给一扔不正确的方向，因此，如果您添加以下code到他的回答能够正常工作：

The main problem is that the RecyclerView sometimes is giving incorrect fling direction, so if you add the following code to his answer it works correctly:

public final class FlingBehavior extends AppBarLayout.Behavior {
    private static final int TOP_CHILD_FLING_THRESHOLD = 3;
    private boolean isPositive;

    public FlingBehavior() {
    }

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

    @Override
    public boolean onNestedFling(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, float velocityX, float velocityY, boolean consumed) {
        if (velocityY > 0 && !isPositive || velocityY < 0 && isPositive) {
            velocityY = velocityY * -1;
        }
        if (target instanceof RecyclerView && velocityY < 0) {
            final RecyclerView recyclerView = (RecyclerView) target;
            final View firstChild = recyclerView.getChildAt(0);
            final int childAdapterPosition = recyclerView.getChildAdapterPosition(firstChild);
            consumed = childAdapterPosition > TOP_CHILD_FLING_THRESHOLD;
        }
        return super.onNestedFling(coordinatorLayout, child, target, velocityX, velocityY, consumed);
    }

    @Override
    public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, int dx, int dy, int[] consumed) {
        super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed);
        isPositive = dy > 0;
    }
}

我希望这会有所帮助。

I hope that this helps.