Common Android Extensions in Kotlin

CommonExtensions.kt

fun View.visible() {
    visibility = View.VISIBLE
}

fun View.invisible() {
    visibility = View.INVISIBLE
}

fun View.gone() {
    visibility = View.GONE
}

fun Context.inflate(res: Int, parent: ViewGroup? = null) : View {
    return LayoutInflater.from(this).inflate(res, parent, false)
}

inline fun Dialog.ifIsShowing(body: Dialog.() -> Unit) {
    if (isShowing) {
        body()
    }
}

inline fun Snackbar.ifIsShowing(body: Snackbar.() -> Unit) {
    if (isShown) {
        body()
    }
}

inline fun ViewGroup.forEach(action: (View) -> Unit) {
    for (index in 0 until childCount) {
        action(getChildAtIndex(index))
    }
}

operator fun ViewGroup.get(position: Int): View? = getChildAt(position)

fun Activity.showOnUiThread(init: Activity.() -> Unit): Activity {
  if (!isFinishing) {
    runOnUiThread {
      init()
    }
  }

  return this
}

fun Activity.showToast(message: String) {
  Toast.makeText(this, message, Toast.LENGTH_LONG).show()
}