Fix preference listener unregistered.

app/src/main/java/me/zobrist/tichucounter/BaseActivity.kt

@@ -1,5 +1,6 @@
 package me.zobrist.tichucounter
 
+import android.content.SharedPreferences
 import android.os.Bundle
 import android.view.WindowManager
 import androidx.appcompat.app.AppCompatActivity
@@ -7,7 +8,8 @@ import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.os.LocaleListCompat
 import androidx.preference.PreferenceManager
 
-abstract class BaseActivity : AppCompatActivity() {
+
+abstract class BaseActivity : AppCompatActivity(), SharedPreferences.OnSharedPreferenceChangeListener {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -16,10 +18,20 @@ abstract class BaseActivity : AppCompatActivity() {
         keepScreenOn(sharedPreferences.getBoolean("screen_on", false))
         updateTheme(sharedPreferences.getString("theme", null))
 
+        PreferenceManager.getDefaultSharedPreferences(this).registerOnSharedPreferenceChangeListener(this)
+    }
 
+    override fun onResume() {
+        super.onResume()
+        PreferenceManager.getDefaultSharedPreferences(this).registerOnSharedPreferenceChangeListener(this)
+    }
 
-        PreferenceManager.getDefaultSharedPreferences(this)
-            .registerOnSharedPreferenceChangeListener { sharedPreferences, key ->
+    override fun onPause() {
+        super.onPause()
+        PreferenceManager.getDefaultSharedPreferences(this).unregisterOnSharedPreferenceChangeListener(this)
+    }
+
+    override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String?) {
         if (key == "language") {
             setLanguage(sharedPreferences.getString("language", null))
         }
@@ -30,7 +42,7 @@ abstract class BaseActivity : AppCompatActivity() {
             updateTheme(sharedPreferences.getString("theme", null))
         }
     }
-    }
+
 
     private fun updateTheme(theme: String?) {
 
@@ -62,6 +74,9 @@ abstract class BaseActivity : AppCompatActivity() {
         if (locale != null && locale != currentLocale) {
             val newLocale = LocaleListCompat.forLanguageTags(locale)
             AppCompatDelegate.setApplicationLocales(newLocale)
+
+            finish()
+            startActivity(intent)
         }
     }
 }