[移动开发]Kotlin dp sp

**
 * 正常编码中一般只会用到 [dp]/[sp] ;
 * 其中[dp]/[sp] 会根据系统分辨率将输入的dp/sp值转换为对应的px
 */
val Float.dp: Float                 // [xxhdpi](360 -> 1080)
    get() = android.util.TypedValue.applyDimension(
        android.util.TypedValue.COMPLEX_UNIT_DIP, this, Resources.getSystem().displayMetrics
    )

val Int.dp: Int
    get() = android.util.TypedValue.applyDimension(
        android.util.TypedValue.COMPLEX_UNIT_DIP,
        this.toFloat(),
        Resources.getSystem().displayMetrics
    ).toInt()


val Float.sp: Float                 // [xxhdpi](360 -> 1080)
    get() = android.util.TypedValue.applyDimension(
        android.util.TypedValue.COMPLEX_UNIT_SP, this, Resources.getSystem().displayMetrics
    )

val Int.sp: Int
    get() = android.util.TypedValue.applyDimension(
        android.util.TypedValue.COMPLEX_UNIT_SP,
        this.toFloat(),
        Resources.getSystem().displayMetrics
    ).toInt()

/**
 * sp转px
 */
fun Context.sp2px(sp: Float): Float = applyDimension(
    TypedValue.COMPLEX_UNIT_SP,
    sp,
    resources.displayMetrics
)

fun Context.sp2px(sp: Int): Int = applyDimension(
    TypedValue.COMPLEX_UNIT_SP,
    sp.toFloat(),
    resources.displayMetrics
).toInt()

/*******View相关********/
fun View?.hide() {
    if (this?.visibility != View.GONE) {
        this?.visibility = View.GONE
    }
}

fun View?.show() {
    if (this?.visibility != View.VISIBLE) {
        this?.visibility = View.VISIBLE
    }
}

fun View?.inVisible() {
    this?.visibility = View.INVISIBLE
}

fun View?.isGone(): Boolean {
    return this?.visibility == View.GONE
}

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