ActivityUtils

/**
 * Context 安全的转Activity
 */
fun Context.asActivity(): Activity? {
    var context = this
    while (context !is Activity && context is ContextWrapper) {
        context = context.baseContext
    }
    return context as? Activity
}

参考：

• https://github.com/pokercc/ExpandableRecyclerView/blob/440734e62c8d3e1b376c8d379562694c3556a92d/app/src/main/java/pokercc/android/expandablerecyclerview/sample/UiUtil.kt

• https://github.com/MeowBase/toolkit/blob/ecf9970e5dee02ce215a45b06b2e31593fc6ed03/core/android/main/kotlin/com/meowbase/toolkit/view/View.kt

• https://github.com/FunkyMuse/KAHelpers/blob/908ee925713cbf32128acccf64213baf655bdcb6/kotlinextensions/src/main/java/com/crazylegend/kotlinextensions/activity/ActivityExtensions.kt