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kakajika/DimBehindPopupWindow.kt

Created July 10, 2019 22:21
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PopupWindow with dim background
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DimBehindPopupWindow.kt
val popup = PopupWindow(...)
val container = popup.contentView.takeIf { it.layoutParams is WindowManager.LayoutParams }
?: (popup.contentView.parent as? View)?.takeIf { it.layoutParams is WindowManager.LayoutParams }
?: (popup.contentView.parent.parent as? View)?.takeIf { it.layoutParams is WindowManager.LayoutParams }
?: throw IllegalStateException("NO WindowManager.LayoutParams!")
val wm = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
val lp = container.layoutParams as WindowManager.LayoutParams
lp.flags = lp.flags or WindowManager.LayoutParams.FLAG_DIM_BEHIND
lp.dimAmount = 0.3f
wm.updateViewLayout(container, lp)
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