TransitionManager + BindingAdapterで簡単Fade Visibility Animation #Android

個人用メモみたいなものです

@BindingAdapter("bind:fadeVisibility")
fun View.fadeVisibility(visibility: Int) {
    val viewParent = this.parent
    if (viewParent is ConstraintLayout) {
        TransitionManager.beginDelayedTransition(viewParent)
    }
    this.visibility = visibility
}

<View
  android:id="@+id/divider_below_wallet_setting"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  bind:fadeVisibility="@{viewModel.isShow ? View.VISIBLE : View.GONE}"/>

これでfadeがかかりながら出たり消えたりしてくれます