How to kotlin getposition spinner by value with custom object?

Question

I'm trying to make a spinner with custom objects. When I do getposition from spinner I get result -1. I do not know the cause

this my code:

Model

class User(var name: String?, var mail: String?) {

    override fun toString(): String {
        return name.toString()
    }
}

Activity

val userList = ArrayList<User>()
val user1 = User("Jim","[email protected]")
userList.add(user1)
val user2 = User("John","[email protected]")
userList.add(user2)
val user3 = User("peki", "[email protected]")
userList.add(user3)


val adapter = ArrayAdapter<User>(this,
    android.R.layout.simple_spinner_item, userList
)
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
spinner.setAdapter(adapter)

val ambilPosisi : Int =  adapter.getPosition(User("peki","[email protected]"))
Toast.makeText(this, (ambilPosisi).toString(), Toast.LENGTH_LONG).show()

Answer 1

Just declare your User class as data class:

data class User(var name: String?, var mail: String?)

It will generate equals() and toString() methods. So you can use it in object comparison.