Kotlin how to access main class variable from other class

Question

This is my main class:

package com.example.myProject

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.GridLayout
import androidx.core.view.marginLeft
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    var level : Int = 1

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //...
        var piece = Piece(this, 50)
    }
}

I also have second class:

data class Piece(
    var con: Context,
    var size : Int
) {

    init {
        //...
        //here I want to increment attribute level of the main class
        con.level++
    }
}

However, I can't access this attribute from there, even though I sent context as a parameter. Any idea what am I doing wrong?

Why do you want to do it that way? Why not adding one on the activity? — cutiko
– cutiko, Commented Oct 19, 2020 at 12:19

Thomas · Accepted Answer · 2020-10-19 12:20:31Z

1

The Context class doesn't have a level attribute, even though the concrete type MainActivity does. So take a reference to a MainActivity instead:

data class Piece(
    var con: MainActivity,
    var size : Int
) {

This creates a circular dependency between MainActivity and Piece, so it could be considered a code smell. Without more context, it's hard to say what a better solution would look like.

answered Oct 19, 2020 at 12:20

Thomas

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