Android BaseActivity with ViewBinding

BaseActivity.kt

import android.os.Bundle
import android.view.LayoutInflater
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.WindowCompat
import androidx.viewbinding.ViewBinding

abstract class BaseActivity<VB: ViewBinding> : AppCompatActivity() {

    private var _binding: VB? = null
    protected val binding get() = _binding!!
    protected abstract val bindingInflater: (LayoutInflater) -> VB

    override fun onCreate(savedInstanceState: Bundle?) {
        //onPrecreate()
        super.onCreate(savedInstanceState)
        WindowCompat.setDecorFitsSystemWindows(window, false) // draw behind system bars
        _binding = bindingInflater.invoke(layoutInflater)
        setContentView(binding.root)
        setup()
    }

    /**
     * Called after setContentView in onCreate
     */
    abstract fun setup()

    override fun onDestroy() {
        super.onDestroy()
        _binding = null
        //onDestroying()
    }
}