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public static interface AppBarLayout.OnOffsetChangedListener

android.support.design.widget.AppBarLayout.OnOffsetChangedListener

AppBarLayout的垂直偏移更改时调用回调的接口定义。

Public methods
`abstract void`	`onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset)` 当 `AppBarLayout`的布局偏移已更改时调用。

void onOffsetChanged (AppBarLayout appBarLayout, 
                int verticalOffset)

当AppBarLayout的布局偏移已更改时调用。这允许子视图基于偏移量实现自定义行为（例如将视图固定在某个y值处）。

Parameters
`appBarLayout`	`AppBarLayout`: the `AppBarLayout` which offset has changed
`verticalOffset`	`int`: the vertical offset for the parent `AppBarLayout`, in px