SwitchPreference

Working, but not updating

app/src/main/java/com/josh/trackcovid19v2/SettingsActivity.java

@@ -4,7 +4,10 @@ import android.os.Bundle;
 
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatDelegate;
+import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.SwitchPreference;
 
 public class SettingsActivity extends AppCompatActivity {
 
@@ -26,6 +29,19 @@ public class SettingsActivity extends AppCompatActivity {
         @Override
         public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
             setPreferencesFromResource(R.xml.root_preferences, rootKey);
+            SwitchPreference darkModeSwitch = findPreference("darkMode");
+            assert darkModeSwitch != null;
+            darkModeSwitch.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+                @Override
+                public boolean onPreferenceChange(Preference preference, Object newValue) {
+                    if (AppCompatDelegate.getDefaultNightMode() == AppCompatDelegate.MODE_NIGHT_YES) {
+                        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
+                    } else {
+                        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
+                    }
+                    return false;
+                }
+            });
         }
     }
 }

app/src/main/res/menu/activity_main_drawer.xml

@@ -27,12 +27,12 @@
     <group
         android:id="@+id/menu_bottom"
         android:checkableBehavior="none">
-        <!--
+
         <item
             android:id="@+id/nav_yoursettings"
             android:icon="@drawable/ic_action_name"
             android:title="@string/item" />
-            -->
+
         <item
             android:id="@+id/nav_sendFeedback"
             android:icon="@drawable/ic_action_name2"

app/src/main/res/values/strings.xml

@@ -38,7 +38,7 @@
     <string name="title_activity_settings">Settings</string>
 
     <!-- Preference Titles -->
-    <string name="messages_header">Messages</string>
+    <string name="messages_header">Preferences</string>
     <string name="sync_header">Sync</string>
 
     <!-- Messages Preferences -->

app/src/main/res/xml/root_preferences.xml

@@ -1,19 +1,14 @@
-<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto">
+<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android">
 
     <PreferenceCategory app:title="@string/messages_header">
 
-        <EditTextPreference
-            app:key="signature"
-            app:title="@string/signature_title"
-            app:useSimpleSummaryProvider="true" />
 
-        <ListPreference
+        <SwitchPreference
-            app:defaultValue="reply"
+            android:key="darkMode"
-            app:entries="@array/reply_entries"
+            android:title="Dark Mode" />
-            app:entryValues="@array/reply_values"
+
-            app:key="reply"
+
-            app:title="@string/reply_title"
-            app:useSimpleSummaryProvider="true" />
 
     </PreferenceCategory>
     <!--