Wrapper to handle nullable activity and returns non-null activity

SafeActivity.kt

fun Activity?.safeActivity(action: Activity.() -> Unit) {
  val isActivityStillRuns = this != null && (!this?.isDestroyed() || !this?.isFinishing())
  if (isActivityStillRuns) {
    action.invoke()
  }
}

// usage:
fun initSomething() = this@YourActivity.safeActivity {
    val adapter = YourAdapter(this, listOf())
}