Refactoring Playground/MainFragment.kt

MainFragment.kt

package com.namhyun.playground

import android.content.Intent
import android.os.Bundle
import android.preference.Preference
import android.preference.PreferenceFragment
import android.preference.PreferenceScreen
import com.namhyun.playground.camera.BasicActivity
import com.namhyun.playground.firebase.DatabaseActivity
import com.namhyun.playground.location.LocationActivity
import com.namhyun.playground.location.LocationUpdatesActivity
import com.namhyun.playground.ui.CircularImageActivity
import com.namhyun.playground.ui.LottieActivity
import kotlin.reflect.KClass

class MainFragment : PreferenceFragment() {

    private lateinit val bindPreferenceMap: HashMap<String, Any>

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        addPreferencesFromResource(R.xml.pref_main_menu)
        
        // if not working getString in property
        bindPreferenceMap = hashMapOf(
          getString(R.string.pref_ui_circularimageview_key) to CircularImageActivity::class
          getString(R.string.pref_ui_lottie_key) to LottieActivity::class
          getString(R.string.pref_location_location_key) to LocationActivity::class
          getString(R.string.pref_location_locationupdates_key) to LocationUpdatesActivity::class
          getString(R.string.pref_camera_basic_key) to BasicActivity::class
          getString(R.string.pref_firebase_database_key) to DatabaseActivity::class
        )
    }

    override fun onPreferenceTreeClick(preferenceScreen: PreferenceScreen?, preference: Preference?): Boolean {
        if (bindPreferenceMap.containsKey(preference?.key)) {
            when (preference?.key) {
                is KClass<*> -> value.java
                is Class<*> -> value
                else -> null
            }.let { startActivity(Intent(activity, it)) }
        }
        return super.onPreferenceTreeClick(preferenceScreen, preference)
    }
}