diff --git a/.idea/dbnavigator.xml b/.idea/dbnavigator.xml
index 22b9d8d..7b1bc5f 100644
--- a/.idea/dbnavigator.xml
+++ b/.idea/dbnavigator.xml
@@ -145,11 +145,11 @@
         <nulls-first value="true" />
         <max-sorting-columns value="4" />
       </sorting>
-      <tracking-columns>
-        <columnNames value="" />
+      <audit-columns>
+        <column-names value="" />
         <visible value="true" />
         <editable value="false" />
-      </tracking-columns>
+      </audit-columns>
     </dataset-grid-settings>
     <dataset-editor-settings>
       <text-editor-popup>
diff --git a/app/src/main/java/com/fatapp/oxygentoolbox/App.java b/app/src/main/java/com/fatapp/oxygentoolbox/App.java
index 0a3937a..2efc2d2 100644
--- a/app/src/main/java/com/fatapp/oxygentoolbox/App.java
+++ b/app/src/main/java/com/fatapp/oxygentoolbox/App.java
@@ -4,11 +4,7 @@ import android.app.Activity;
 import android.app.Application;
 import android.content.Context;
 import android.content.res.Configuration;
-import android.content.res.Resources;
-import android.os.Build;
 import android.os.Bundle;
-import android.os.LocaleList;
-import android.util.DisplayMetrics;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -17,8 +13,6 @@ import com.fatapp.oxygentoolbox.util.MultiLanguageUtils;
 import com.fatapp.oxygentoolbox.util.ResourceUtil;
 import com.fatapp.oxygentoolbox.util.SharedPreferencesUtils;
 
-import java.util.Locale;
-
 public class App extends Application {
     @Override
     public void onCreate() {
@@ -27,9 +21,10 @@ public class App extends Application {
         registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
             @Override
             public void onActivityCreated(@NonNull Activity activity, @Nullable Bundle bundle) {
-                ResourceUtil.init(App.this);
                 SharedPreferencesUtils.init(App.this);
-                setAppLanguage(getApplicationContext(), SharedPreferencesUtils.getLanguage());
+                ResourceUtil.init(App.this);
+                ResourceUtil.setAppLocale(SharedPreferencesUtils.getPreferenceLocale());
+                loadAppUiMode();
             }
 
             @Override
@@ -75,23 +70,16 @@ public class App extends Application {
         MultiLanguageUtils.attachBaseContext(this);
     }
 
-
-    private static void setAppLanguage(Context context, Locale locale) {
-        Resources resources = context.getResources();
-        Configuration configuration = resources.getConfiguration();
-        DisplayMetrics displayMetrics = resources.getDisplayMetrics();
-        //Android 7.0以上的方法
-        if (Build.VERSION.SDK_INT >= 24) {
-            configuration.setLocale(locale);
-            configuration.setLocales(new LocaleList(locale));
-            context.createConfigurationContext(configuration);
-            //实测，updateConfiguration这个方法虽然很多博主说是版本不适用
-            //但是我的生产环境androidX+Android Q环境下，必须加上这一句，才可以通过重启App来切换语言
-            resources.updateConfiguration(configuration, displayMetrics);
-        } else {
-            //Android 4.1 以上方法
-            configuration.setLocale(locale);
-            resources.updateConfiguration(configuration, displayMetrics);
+    public static void loadAppUiMode() {
+        switch (SharedPreferencesUtils.getPreferenceUiMode()) {
+            case light:
+                ResourceUtil.setAppUiMode(ResourceUtil.UI_MODE_LIGHT);
+                break;
+            case dark:
+                ResourceUtil.setAppUiMode(ResourceUtil.UI_MODE_DARK);
+                break;
+            default:
+                ResourceUtil.setAppUiMode(ResourceUtil.getSystemUiMode());
         }
     }
 }
diff --git a/app/src/main/java/com/fatapp/oxygentoolbox/ui/home/HomeFragment.java b/app/src/main/java/com/fatapp/oxygentoolbox/ui/home/HomeFragment.java
index 0f8d9cf..80b45ff 100644
--- a/app/src/main/java/com/fatapp/oxygentoolbox/ui/home/HomeFragment.java
+++ b/app/src/main/java/com/fatapp/oxygentoolbox/ui/home/HomeFragment.java
@@ -56,7 +56,7 @@ public class HomeFragment extends Fragment {
             }
         });
 
-        bottomNavViewPager.setCurrentItem(SharedPreferencesUtils.getLaunchPage() == SharedPreferencesUtils.LaunchPage.tools ? 0 : 1, false);
+        bottomNavViewPager.setCurrentItem(SharedPreferencesUtils.getPreferenceLaunchPage() == SharedPreferencesUtils.LaunchPage.tools ? 0 : 1, false);
 
         return root;
     }
diff --git a/app/src/main/java/com/fatapp/oxygentoolbox/ui/setting/SettingFragment.java b/app/src/main/java/com/fatapp/oxygentoolbox/ui/setting/SettingFragment.java
index ff09143..86268ea 100644
--- a/app/src/main/java/com/fatapp/oxygentoolbox/ui/setting/SettingFragment.java
+++ b/app/src/main/java/com/fatapp/oxygentoolbox/ui/setting/SettingFragment.java
@@ -1,16 +1,18 @@
 package com.fatapp.oxygentoolbox.ui.setting;
 
 import android.content.Intent;
+import android.content.res.Configuration;
 import android.os.Bundle;
+import android.util.Log;
 
 import androidx.annotation.Nullable;
+import androidx.navigation.Navigation;
 import androidx.preference.ListPreference;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
 
 import com.fatapp.oxygentoolbox.MainActivity;
 import com.fatapp.oxygentoolbox.R;
-import com.fatapp.oxygentoolbox.ui.about.LibrariesActivity;
 import com.fatapp.oxygentoolbox.util.ResourceUtil;
 
 public class SettingFragment extends PreferenceFragmentCompat {
@@ -21,10 +23,7 @@ public class SettingFragment extends PreferenceFragmentCompat {
         ListPreference appLanguagePreference = findPreference(ResourceUtil.getString(R.string.setting_language_key));
         if (appLanguagePreference != null) {
             appLanguagePreference.setOnPreferenceChangeListener((preference, newValue) -> {
-                Intent intent = new Intent(getActivity(), MainActivity.class);
-                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
-                requireActivity().startActivity(intent);
-                requireActivity().finish();
+                ResourceUtil.restartActivity(requireActivity(), MainActivity.class);
                 return true;
             });
         }
@@ -32,10 +31,20 @@ public class SettingFragment extends PreferenceFragmentCompat {
         Preference aboutPreference = findPreference(ResourceUtil.getString(R.string.setting_about_oxygen_toolbox_key));
         if (aboutPreference != null) {
             aboutPreference.setOnPreferenceClickListener(preference -> {
+/*
                 Intent intent = new Intent(getActivity(), LibrariesActivity.class);
                 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                 startActivity(intent);
-//                Navigation.findNavController(requireView()).navigate(R.id.action_setting_to_about);
+*/
+                Navigation.findNavController(requireView()).navigate(R.id.action_setting_to_about);
+                return true;
+            });
+        }
+
+        ListPreference uiModePreference = findPreference(ResourceUtil.getString(R.string.setting_ui_mode_key));
+        if (uiModePreference != null) {
+            uiModePreference.setOnPreferenceChangeListener((preference, newValue) -> {
+                ResourceUtil.restartActivity(requireActivity(), MainActivity.class);
                 return true;
             });
         }
diff --git a/app/src/main/java/com/fatapp/oxygentoolbox/util/MultiLanguageUtils.java b/app/src/main/java/com/fatapp/oxygentoolbox/util/MultiLanguageUtils.java
index bff4b25..6bb676f 100644
--- a/app/src/main/java/com/fatapp/oxygentoolbox/util/MultiLanguageUtils.java
+++ b/app/src/main/java/com/fatapp/oxygentoolbox/util/MultiLanguageUtils.java
@@ -10,12 +10,11 @@ import android.util.DisplayMetrics;
 import androidx.annotation.RequiresApi;
 
 import java.util.Locale;
-import java.util.Objects;
 
 public class MultiLanguageUtils {
 
     public static Context attachBaseContext(Context context) {
-        Locale locale = SharedPreferencesUtils.getLanguage();
+        Locale locale = SharedPreferencesUtils.getPreferenceLocale();
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
             return createConfigurationContext(context, locale.getLanguage(), locale.getCountry());
         } else {
diff --git a/app/src/main/java/com/fatapp/oxygentoolbox/util/ResourceUtil.java b/app/src/main/java/com/fatapp/oxygentoolbox/util/ResourceUtil.java
index 4f98925..ae5b805 100644
--- a/app/src/main/java/com/fatapp/oxygentoolbox/util/ResourceUtil.java
+++ b/app/src/main/java/com/fatapp/oxygentoolbox/util/ResourceUtil.java
@@ -1,13 +1,16 @@
 package com.fatapp.oxygentoolbox.util;
 
 import android.annotation.SuppressLint;
+import android.app.Activity;
 import android.app.Application;
 import android.content.Context;
+import android.content.Intent;
 import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.Color;
 import android.graphics.Rect;
 import android.os.Build;
+import android.os.LocaleList;
 import android.util.DisplayMetrics;
 import android.view.Window;
 
@@ -25,11 +28,17 @@ import java.util.Locale;
 import java.util.Objects;
 
 public final class ResourceUtil {
+    private static int UI_MODE_SYSTEM;
+    public static final int UI_MODE_LIGHT = Configuration.UI_MODE_NIGHT_NO + Configuration.UI_MODE_TYPE_NORMAL;
+    public static final int UI_MODE_DARK = Configuration.UI_MODE_NIGHT_YES + Configuration.UI_MODE_TYPE_NORMAL;
 
     private static Application sApp;
 
     public static void init(Application app) {
         sApp = app;
+        if (UI_MODE_SYSTEM == 0) {
+            UI_MODE_SYSTEM = getAppUiMode();
+        }
     }
 
     public static Application getApplication() {
@@ -110,6 +119,41 @@ public final class ResourceUtil {
         return ConfigurationCompat.getLocales(configuration);
     }
 
+    public static void setAppLocale(Locale locale) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            getConfiguration().setLocale(locale);
+            getConfiguration().setLocales(new LocaleList(locale));
+            getApplication().createConfigurationContext(getConfiguration());
+        } else {
+            getConfiguration().setLocale(locale);
+        }
+        updateConfiguration();
+    }
+
+    public static int getSystemUiMode() {
+        return UI_MODE_SYSTEM;
+    }
+
+    public static int getAppUiMode() {
+        return getConfiguration().uiMode;
+    }
+
+    public static void setAppUiMode(int uiMode) {
+        getConfiguration().uiMode = uiMode;
+        updateConfiguration();
+    }
+
+    private static void updateConfiguration() {
+        getResources().updateConfiguration(getConfiguration(), getDisplayMetrics());
+    }
+
+    public static void restartActivity(Activity activity, Class<?> cls) {
+        Intent intent = new Intent(activity, cls);
+        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
+        activity.startActivity(intent);
+        activity.finish();
+    }
+
     public static int dpToPx(float dp) {
         return (int) (dp * getDisplayMetrics().density + 0.5f);
     }
diff --git a/app/src/main/java/com/fatapp/oxygentoolbox/util/SharedPreferencesUtils.java b/app/src/main/java/com/fatapp/oxygentoolbox/util/SharedPreferencesUtils.java
index a608453..f5ff92d 100644
--- a/app/src/main/java/com/fatapp/oxygentoolbox/util/SharedPreferencesUtils.java
+++ b/app/src/main/java/com/fatapp/oxygentoolbox/util/SharedPreferencesUtils.java
@@ -17,7 +17,11 @@ public class SharedPreferencesUtils {
         preferences = PreferenceManager.getDefaultSharedPreferences(app);
     }
 
-    public static Locale getLanguage() {
+    public static boolean isNull() {
+        return preferences == null;
+    }
+
+    public static Locale getPreferenceLocale() {
         String languagePreference;
         String language;
         String country;
@@ -33,15 +37,21 @@ public class SharedPreferencesUtils {
         return new Locale(language, country);
     }
 
-    public static boolean isNull() {
-        return preferences == null;
-    }
-
-    public static LaunchPage getLaunchPage() {
+    public static LaunchPage getPreferenceLaunchPage() {
         return LaunchPage.valueOf(preferences.getString(ResourceUtil.getString(R.string.setting_launch_page_key), ResourceUtil.getString(R.string.setting_launch_page_default_value)));
     }
 
-    public enum LaunchPage {
-        tools,favourites
+    public static UiMode getPreferenceUiMode() {
+        return UiMode.valueOf(preferences.getString(ResourceUtil.getString(R.string.setting_ui_mode_key), ResourceUtil.getString(R.string.setting_ui_mode_default_value)));
     }
-}
+
+    @SuppressWarnings("unused")
+    public enum LaunchPage {
+        tools, favourites
+    }
+
+    @SuppressWarnings("unused")
+    public enum UiMode {
+        system, light, dark
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/fatapp/oxygentoolbox/util/ToolsList.java b/app/src/main/java/com/fatapp/oxygentoolbox/util/ToolsList.java
index f0027dc..0d29d96 100644
--- a/app/src/main/java/com/fatapp/oxygentoolbox/util/ToolsList.java
+++ b/app/src/main/java/com/fatapp/oxygentoolbox/util/ToolsList.java
@@ -41,7 +41,7 @@ public class ToolsList {
     }
 
     private static String getLocale(Locales strings) {
-        if (SharedPreferencesUtils.getLanguage().getLanguage().equals("zh")) {
+        if (SharedPreferencesUtils.getPreferenceLocale().getLanguage().equals("zh")) {
             return strings.getCn();
         }
         return strings.getEn();
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 25bee5c..198e62d 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -37,6 +37,12 @@
         <item>工具</item>
         <item>收藏</item>
     </string-array>
+    <string name="setting_ui_mode">主题模式</string>
+    <string-array name="setting_ui_mode_array">
+        <item>跟随系统</item>
+        <item>亮色</item>
+        <item>深色</item>
+    </string-array>
     <string name="setting_open_source">开源许可</string>
     <string name="setting_search">查找</string>
     <string name="setting_about">关于</string>
diff --git a/app/src/main/res/values-zh-rHK/strings.xml b/app/src/main/res/values-zh-rHK/strings.xml
index 1060723..198e62d 100644
--- a/app/src/main/res/values-zh-rHK/strings.xml
+++ b/app/src/main/res/values-zh-rHK/strings.xml
@@ -33,6 +33,16 @@
         <item>English</item>
     </string-array>
     <string name="setting_launch_page">启动页</string>
+    <string-array name="setting_launch_page_array">
+        <item>工具</item>
+        <item>收藏</item>
+    </string-array>
+    <string name="setting_ui_mode">主题模式</string>
+    <string-array name="setting_ui_mode_array">
+        <item>跟随系统</item>
+        <item>亮色</item>
+        <item>深色</item>
+    </string-array>
     <string name="setting_open_source">开源许可</string>
     <string name="setting_search">查找</string>
     <string name="setting_about">关于</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index 1060723..198e62d 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -33,6 +33,16 @@
         <item>English</item>
     </string-array>
     <string name="setting_launch_page">启动页</string>
+    <string-array name="setting_launch_page_array">
+        <item>工具</item>
+        <item>收藏</item>
+    </string-array>
+    <string name="setting_ui_mode">主题模式</string>
+    <string-array name="setting_ui_mode_array">
+        <item>跟随系统</item>
+        <item>亮色</item>
+        <item>深色</item>
+    </string-array>
     <string name="setting_open_source">开源许可</string>
     <string name="setting_search">查找</string>
     <string name="setting_about">关于</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index e9a8a86..126c44e 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -41,11 +41,11 @@
         <item>English</item>
     </string-array>
     <string-array name="setting_language_values">
-        <item>default</item>
+        <item>system</item>
         <item>zh_CN</item>
         <item>en_US</item>
     </string-array>
-    <string name="setting_language_default_value" translatable="false">default</string>
+    <string name="setting_language_default_value" translatable="false">system</string>
     <string name="setting_launch_page">Launch Page</string>
     <string name="setting_launch_page_key" translatable="false">app_launch_page</string>
     <string-array name="setting_launch_page_array">
@@ -57,6 +57,19 @@
         <item>favourites</item>
     </string-array>
     <string name="setting_launch_page_default_value" translatable="false">tools</string>
+    <string name="setting_ui_mode">Theme Mode</string>
+    <string name="setting_ui_mode_key" translatable="false">app_ui_mode</string>
+    <string-array name="setting_ui_mode_array">
+        <item>Follow System</item>
+        <item>Light</item>
+        <item>Dark</item>
+    </string-array>
+    <string-array name="setting_ui_mode_values">
+        <item>system</item>
+        <item>light</item>
+        <item>dark</item>
+    </string-array>
+    <string name="setting_ui_mode_default_value" translatable="false">system</string>
     <string name="setting_open_source">OpenSource</string>
     <string name="setting_search">Search</string>
     <string name="setting_about">About</string>
diff --git a/app/src/main/res/xml/fragment_setting.xml b/app/src/main/res/xml/fragment_setting.xml
index 96916d5..b74e363 100644
--- a/app/src/main/res/xml/fragment_setting.xml
+++ b/app/src/main/res/xml/fragment_setting.xml
@@ -17,6 +17,13 @@
             app:key="@string/setting_launch_page_key"
             app:title="@string/setting_launch_page"
             app:useSimpleSummaryProvider="true" />
+        <ListPreference
+            app:defaultValue="@string/setting_ui_mode_default_value"
+            app:entries="@array/setting_ui_mode_array"
+            app:entryValues="@array/setting_ui_mode_values"
+            app:key="@string/setting_ui_mode_key"
+            app:title="@string/setting_ui_mode"
+            app:useSimpleSummaryProvider="true" />
     </PreferenceCategory>
 
     <PreferenceCategory app:title="@string/setting_about">