A popup window that can be used to display an arbitrary view. The popup window is a floating container that appears on top of the current activity.A popup window that
阅读背景：
Android Popwindow的使用（从屏幕下方往上弹起，背景变暗）
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A popup window that can be used to display an arbitrary view. The popup window is a floating container that appears on top of the current activity.A popup window that
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