Theme_1

MainActivity.kt

private fun setTheme(theme: ThemeManager.Theme, animate: Boolean = true) {
    if (!animate) {
        ThemeManager.theme = theme
        return
    }

    if (imageView.isVisible) {
        return
    }

    val w = container.measuredWidth
    val h = container.measuredHeight

    val bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888)
    val canvas = Canvas(bitmap)
    container.draw(canvas)

    imageView.setImageBitmap(bitmap)
    imageView.isVisible = true

    val finalRadius = hypot(w.toFloat(), h.toFloat())

    ThemeManager.theme = theme

    val anim = ViewAnimationUtils.createCircularReveal(imageView, w / 2, h / 2, finalRadius, 0f)
    anim.duration = 400L
    anim.doOnEnd {
        imageView.setImageDrawable(null)
        imageView.isVisible = false
    }
    anim.start()
}