Disable vertical scroll in CollapsingToolbarLayout / AppBarLayout

Question

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

Answer 1

Ok, i found out the solution for this.

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;
    }
});

Solution from here: How to disable scrolling of AppBarLayout in CoordinatorLayout?

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());