override fun onCreate(savedInstanceState: Bundle?) {
   super.onCreate(savedInstanceState)
   setContentView(R.layout.activity_main)
   bt_click.setOnClickListener {
     Toast.makeText(this,"点击了",Toast.LENGTH_SHORT).show();
   }
 }

class MainActivity : AppCompatActivity(), View.OnClickListener {
 override fun onClick(v: View?) {
   when (v?.id) {
     R.id.bt_click ->
       Toast.makeText(this, "点击了", Toast.LENGTH_SHORT).show()
   }
 }

 override fun onCreate(savedInstanceState: Bundle?) {
   super.onCreate(savedInstanceState)
   setContentView(R.layout.activity_main)
   bt_click.setOnClickListener(this)
 }
}

fun click(v: View?) {
   when (v?.id) {
     R.id.bt_click ->
       Toast.makeText(this, "点击了", Toast.LENGTH_SHORT).show()
   }
 }

 override fun onCreate(savedInstanceState: Bundle?) {
   super.onCreate(savedInstanceState)
   setContentView(R.layout.activity_main)
 }

<Button
   android:id="@+id/bt_click"
   android:layout_width="match_parent"
   android:layout_height="50dp"
   android:onClick="click"
   android:text="点击" />