1

fun incrementCount(view: View) {
        handleCounter(1)
    }

<Button
  .....
       android:onClick="incrementCount" />

2

<Button
  .....
       android:id="@+id/btn_increment" />

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

    private fun initView() {
        val btn_increment: Button = findViewById(R.id.btn_increment)
        btn_increment.setOnClickListener { btn_increment() }
    }
    
    private fun btn_increment() { // 参数不需要加入 view: View
         handleCounter(1)
    }