在CollapsingToolbarLayout/AppBarLayout中禁用垂直滚动 [英] Disable vertical scroll in CollapsingToolbarLayout / AppBarLayout

问题描述

我只希望在nestedscrollview中发生滚动/触摸事件时，在CollapsingToolbarLayout/AppBarLayout上垂直滚动(这是有效的)，但是如果用户尝试直接滚动CollapsingToolbarLayout/AppBarLayout，则它不起作用.我之所以需要这样做，是因为那里的滚动/触摸事件与我的recyclerview滚动事件搞混了.

I would like the vertical scroll on the CollapsingToolbarLayout / AppBarLayout ONLY when the scroll/touch event occurs in the nestedscrollview (this is working), but if the user tries to scroll the CollapsingToolbarLayout / AppBarLayout directly it should not work. I need this because the scroll/touch events there are messing with my recyclerview scroll events.

我有这样的结构:

CoordinatorLayout

-- AppBarLayout

---- CollapsingToolbarLayout (scrollflags: scroll, exitUntilCollapsed, snap)

------ Toolbar (CollapseMode: pin)

------ RecyclerView (Horizontal, CollapseMode: pin)

----- /CollapsingToolbarLayout

-- /AppBarLayout

-- NestedScrollView (Behaviour: appbar_scrolling_view_behavior)

-- /NestedScrollView

/ CoordinatorLayout

我尝试为CollapsingToolbarLayout/AppBarLayout覆盖onTouch()和onInterceptTouchEvent()，但是它一直拦截触摸事件/滚动.

I tried overriding onTouch() and onInterceptTouchEvent() for both CollapsingToolbarLayout / AppBarLayout but it keeps intercepting the touch event/scroll.

推荐答案

好，我找到了解决方案.

Ok, i found out the solution for this.

您只需要在AppBarLayout行为中覆盖onDrag()方法，并且如果触摸发生在AppBarLayout视图的顶部，则不会触发滚动.

You just have to override the onDrag() method in the AppBarLayout behaviour and the scroll wont be triggered if the touch occurs on top of the AppBarLayout view.

CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams();
AppBarLayout.Behavior behavior = (AppBarLayout.Behavior) params.getBehavior();
behavior.setDragCallback(new AppBarLayout.Behavior.DragCallback() {
    @Override
    public boolean canDrag(@NonNull AppBarLayout appBarLayout) {
        return false;
    }
});

解决方案从这里: 如何在CoordinatorLayout中禁用AppBarLayout滚动?

如果由于行为为空而遇到NullPointerException，则应首先分配一个:

If you run into NullPointerException because of a null Behavior, you should assign one first:

CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) mAppbar.getLayoutParams();
params.setBehavior(new AppBarLayout.Behavior());

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