Number extensions to convert px/dp/sp/pt/mm.

example.kt

view.setPadding(20.dp.toPx, 20.dp.toPx, 20.dp.toPx, 20.dp.toPx)

Pixel.kt

/**
 * px/dp/sp/pt/mm unit converter.
 * This is not incompatible with Jetpack Compose.
 */
inline class Pixel(private val pxF: Float) {
    val toPx: Int @Px get() = pxF.roundToInt()

    fun toDp(res: Resources = Resources.getSystem()): Float = pxF / TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_DIP, 1.0f, res.displayMetrics
    )

    fun toSp(res: Resources = Resources.getSystem()): Float = pxF / TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_SP, 1.0f, res.displayMetrics
    )

    fun toPt(res: Resources = Resources.getSystem()): Float = pxF / TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_PT, 1.0f, res.displayMetrics
    )

    fun toMm(res: Resources = Resources.getSystem()): Float = pxF / TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_MM, 1.0f, res.displayMetrics
    )

    companion object {
        fun fromDp(dp: Float, res: Resources = Resources.getSystem()) = Pixel(TypedValue.applyDimension(
            TypedValue.COMPLEX_UNIT_DIP, dp, res.displayMetrics
        ))

        fun fromSp(sp: Float, res: Resources = Resources.getSystem()) = Pixel(TypedValue.applyDimension(
            TypedValue.COMPLEX_UNIT_SP, sp, res.displayMetrics
        ))

        fun fromPt(pt: Float, res: Resources = Resources.getSystem()) = Pixel(TypedValue.applyDimension(
            TypedValue.COMPLEX_UNIT_PT, pt, res.displayMetrics
        ))

        fun fromMm(mm: Float, res: Resources = Resources.getSystem()) = Pixel(TypedValue.applyDimension(
            TypedValue.COMPLEX_UNIT_MM, mm, res.displayMetrics
        ))
    }
}

inline val Int.px get() = Pixel(pxF = this.toFloat())
inline val Float.px get() = Pixel(pxF = this)

inline val Int.dp get() = Pixel.fromDp(dp = this.toFloat())
inline val Float.dp get() = Pixel.fromDp(dp = this)

inline val Int.sp get() = Pixel.fromSp(sp = this.toFloat())
inline val Float.sp get() = Pixel.fromSp(sp = this)

inline val Int.pt get() = Pixel.fromPt(pt = this.toFloat())
inline val Float.pt get() = Pixel.fromPt(pt = this)

inline val Int.mm get() = Pixel.fromMm(mm = this.toFloat())
inline val Float.mm get() = Pixel.fromMm(mm = this)