java.lang.NullPointerException: Attempt to invoke virtual method ''int android.view.View.getWindowSystemUiVisibility()'' on a null object reference
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java.lang.NullPointerException: Attempt to invoke virtual method ''int android.view.View.getWindowSystemUiVisibility()'' on a null object reference
at android.widget.PopupWindow.getSysUiVisibility(PopupWindow.java)