//In build.gradle (:app):

android {

    buildFeatures {

        viewBinding true

    }

}

​

//In an AppCompatActivity:

import myProject.MyActivityBinding //Where my_activity.xml is a res/layout file.

​

class MyActivity: AppCompatActivity() {

    private lateinit var myActivityBinding: MyActivityBinding

​

    override fun onCreate(savedInstanceState: Bundle?) {

      super.onCreate(savedInstanceState)

      myActivityBinding = MyActivityBinding.inflate(layoutInflater)

      setContentView(myActivityBinding.root)

      foo()

    }

    fun foo() {

        myActivityBinding.buttonToClick.setOnClickListener { ... }

        //Where my_activity.xml has a View whose ID is button_to_click.

    }

}