PrefActivity.kt

import android.content.Context
import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import com.coderefer.newyorktimesapp.R

class PrefActivity : AppCompatActivity() {
    private val btnDarkMode: Button = Button(this)
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_pref)
        btnDarkMode.setOnClickListener {
            val sharedPreferences = getSharedPreferences("darkModePref", Context.MODE_PRIVATE)
            val editor = sharedPreferences.edit()
            editor.putBoolean("darkMode", true)
            editor.apply()
        }
    }
}