One `onClickListener` for many buttons in kotlin?

Question

How to create one onClickListener for many buttons in kotlin, i know there is already a solutin for it in Java but how to do it in kotlin ?

Answer 1

You can implement OnClickListener interface at class level and perform the actions by checking the button's ids in overridden method i.e. onClick(v: View?) as follows

class MainActivity : AppCompatActivity(), View.OnClickListener {

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

        val button1 = findViewById<Button>(R.id.button1)
        val button2 = findViewById<Button>(R.id.button2)
        button1.setOnClickListener(this)
        button2.setOnClickListener(this)
    }

    override fun onClick(v: View?) {

        when (v?.getId()) {
            R.id.button1 -> firstFun()
            R.id.button2 -> secondFun()
        }
    }

    private fun firstFun() {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }

    private fun secondFun() {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }
}

Cheers :)