Cfrgtkky

I have the following piece of code for a setting page using Preferences. I can find the correct ListPreference, I can set the summary string, but I cannot get the value from the preference object. At least Android Studio cannot find the reference to the getValue() method.

import android.support.v7.app.AppCompatActivity

import android.os.Bundle

import android.support.v7.preference.ListPreference

import android.support.v7.preference.Preference

import android.support.v7.preference.PreferenceFragmentCompat





class SettingsActivity : AppCompatActivity() {



    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_settings)



        setSupportActionBar(findViewById(R.id.settings_toolbar))

        supportActionBar?.setDisplayHomeAsUpEnabled(true)



        supportFragmentManager

            .beginTransaction()

            .replace(R.id.content_settings, MySettingsFragment())

            .commit()



    }



    class MySettingsFragment : PreferenceFragmentCompat() {

        override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {

            setPreferencesFromResource(R.xml.pref_settings, rootKey)

            val pref = findPreference("selected_maptype")

            pref.summary = "This is a summary"

            val current_value = pref.getValue()

        }

    }

}

getValue() is method of ListPreference not Preference, so you need to cast it.

val pref = findPreference("selected_maptype") as ListPreference

val current_value = pref.value

You will use pref.value instead of pref.getValue() in Kotlin. Kotlin changes getters setters in direct name.