as奇葩问题：findviewbuid

Error:(43, 31) Type inference failed: Not enough information to infer parameter T in fun <T : View!>

Try something like:

val recyclerView = findViewById<RecyclerView>(R.id.recycler_view)

You can use Kotlin Android Extensions too for that. Check the doc here.
With it, you can call recycler_view directly in your code.

Or this:

val recycler_view: RecyclerView = findViewById(R.id.recycler_view)