I can't use setOnClickListener in Kotlin-CodePudding

i am trying to set up a second page for my android app but when i try to do it my setOnClickListener is red here is the code part:

    override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    val MainActivity2 = findViewById<Button>(R.id.button)
    Button.setOnClickListener {
        val Intent = Intent(this,MainActivity2::class.java)
        startActivity(Intent)
    }

Does anyone know why the setOnClickListener is red ? (the Button. is not red)

CodePudding user response：

You have assigned your button into the variable named MainActivity2. You do not currently have a variable named Button I assume. You need to use

MainActivity2.setOnClickListener {code here} instead

Another way for you to do the same thing:

In your xml file for your Button element, you can add an onClicked attribute. Example:

<Button
    ...
    android:onClick="deleteAll"
    android:clickable="true"/>

In your kotlin file which uses that xml file for the view:

fun deleteAll(view: View) {
    doSomething()
}