/**
     * 获取 View 的高斯模糊 Bitmap
     */
    fun gaussianBlur(v: View): BitmapDrawable? {
        val renderScript = RenderScript.create(v.context)
        v.setDrawingCacheEnabled(true)
        val origin = v.getDrawingCache() ?: return null
        val input = Allocation.createFromBitmap(renderScript, origin)
        val output = Allocation.createTyped(renderScript, input.type)
        val scriptIntrinsicBlur = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript))
        scriptIntrinsicBlur.setRadius(RADIUS)
        scriptIntrinsicBlur.setInput(input)
        scriptIntrinsicBlur.forEach(output)
        output.copyTo(origin)
        val bg = Bitmap.createBitmap(origin) ?: return null
        v.setDrawingCacheEnabled(false)
        return BitmapDrawable(bg)
    }