I implement Collapsing ToolBar Layout in my Activity. I create RecyclerView too in this Activity. I Have problem, When I how PopUp Menu item RecyclerView, Collapsing ToolBar always Colapse. I implement Collapsing ToolBar Layout in my Act
阅读背景：
如果显示弹出式菜单项回收视图，崩溃的工具栏布局总是会消失。
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