diff --git a/app/src/main/java/de/k3b/android/GuiUtil.java b/app/src/main/java/de/k3b/android/GuiUtil.java
index a72aa62d..61493b1a 100644
--- a/app/src/main/java/de/k3b/android/GuiUtil.java
+++ b/app/src/main/java/de/k3b/android/GuiUtil.java
@@ -19,20 +19,13 @@
  
 package de.k3b.android;
 
-import android.app.Activity;
 import android.content.Context;
 import android.content.pm.PackageManager.NameNotFoundException;
-import android.preference.PreferenceManager;
-
-import de.k3b.android.androFotoFinder.R;
 
 /**
  * gui utils
  */
 public class GuiUtil {
-
-    public static final String PREF_KEY_USER_THEME = "user_theme";
-
     public static String getAppVersionName(final Context context) {
         try {
 
@@ -43,21 +36,5 @@ public static String getAppVersionName(final Context context) {
         }
         return null;
     }
-    public static void setTheme(Activity act) {
-        final String theme = getTheme(act);
-        switch (theme) {
-            case "Light":
-                act.setTheme(R.style.AppTheme_Light);
-                break;
-            case "Dark":
-                act.setTheme(R.style.AppTheme_Dark);
-                break;
-            default:
-                throw new RuntimeException("Invalid theme '" + theme+ "' selected");
-        }
-    }
 
-    public static String getTheme(Context context) {
-        return PreferenceManager.getDefaultSharedPreferences(context).getString(PREF_KEY_USER_THEME, "Light");
-    }
 }
diff --git a/app/src/main/java/de/k3b/android/androFotoFinder/SettingsActivity.java b/app/src/main/java/de/k3b/android/androFotoFinder/SettingsActivity.java
index d464273d..f3c89807 100644
--- a/app/src/main/java/de/k3b/android/androFotoFinder/SettingsActivity.java
+++ b/app/src/main/java/de/k3b/android/androFotoFinder/SettingsActivity.java
@@ -39,11 +39,11 @@
 import java.io.File;
 
 import de.k3b.LibGlobal;
-import de.k3b.android.GuiUtil;
 import de.k3b.android.androFotoFinder.imagedetail.HugeImageLoader;
 import de.k3b.android.util.PhotoPropertiesMediaFilesScanner;
 import de.k3b.android.util.PhotoPropertiesMediaFilesScannerExifInterface;
 import de.k3b.android.util.PhotoPropertiesMediaFilesScannerImageMetaReader;
+import de.k3b.android.util.UserTheme;
 import de.k3b.android.widget.AboutDialogPreference;
 import de.k3b.android.widget.ActivityWithCallContext;
 import de.k3b.android.widget.LocalizedActivity;
@@ -65,8 +65,7 @@ public class SettingsActivity extends PreferenceActivity {
 
     @Override
     protected void onCreate(final Bundle savedInstanceState) {
-        GuiUtil.setTheme(this); // this activity doesn't extent ActivityWithCallContext
-        LocalizedActivity.fixLocale(this);	// #21: Support to change locale at runtime
+        LocalizedActivity.fixThemeAndLocale(this);    // #21: Support to change locale at runtime
         super.onCreate(savedInstanceState);
 
         if (Global.debugEnabled) {
@@ -96,7 +95,7 @@ public boolean onPreferenceChange(Preference preference, Object newValue) {
             }
         });
 
-        themePreference = (ListPreference) findPreference(GuiUtil.PREF_KEY_USER_THEME);
+        themePreference = (ListPreference) findPreference(UserTheme.PREF_KEY_USER_THEME);
         themePreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
             @Override
             public boolean onPreferenceChange(Preference preference, Object newValue) {
@@ -415,17 +414,17 @@ private void updateSummary() {
         final String languageKey = prefsInstance.getString(Global.PREF_KEY_USER_LOCALE, "");
         setLanguage(languageKey);
 
-        setUserTheme(GuiUtil.getTheme(this));
+        setUserTheme(UserTheme.getThemeKey(this));
         AboutDialogPreference about =
                 (AboutDialogPreference) findPreference("about");
         about.setTitle(AboutDialogPreference.getAboutTitle(this));
     }
 
     private void setUserTheme(String newValue) {
-        setPref(GuiUtil.PREF_KEY_USER_THEME, this.themePreference, R.array.pref_themes_names);
+        setPref(UserTheme.PREF_KEY_USER_THEME, this.themePreference, R.array.pref_themes_names);
+        LocalizedActivity.setMustRecreate();
     }
 
-
     // #21: Support to change locale at runtime
     private void setLanguage(String languageKey) {
         setPref(languageKey, defaultLocalePreference, R.array.pref_locale_names);
diff --git a/app/src/main/java/de/k3b/android/util/UserTheme.java b/app/src/main/java/de/k3b/android/util/UserTheme.java
new file mode 100644
index 00000000..44cec3cb
--- /dev/null
+++ b/app/src/main/java/de/k3b/android/util/UserTheme.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2019-2020 by vinceh121
+ *
+ * This file is part of AndroFotoFinder.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>
+ */
+
+package de.k3b.android.util;
+
+import android.app.Activity;
+import android.content.Context;
+import android.preference.PreferenceManager;
+
+import de.k3b.android.androFotoFinder.R;
+
+/**
+ * #162: change Theme at runtime
+ */
+public class UserTheme {
+    public static final String PREF_KEY_USER_THEME = "user_theme";
+
+    public static void setTheme(Activity act) {
+        final String themeKey = getThemeKey(act);
+        int themeID = ("Dark".compareTo(themeKey) != 0)
+                ? R.style.AppTheme_Light
+                : R.style.AppTheme_Dark;
+        act.setTheme(themeID);
+    }
+
+    public static String getThemeKey(Context context) {
+        return PreferenceManager.getDefaultSharedPreferences(context).getString(PREF_KEY_USER_THEME, "Light");
+    }
+}
diff --git a/app/src/main/java/de/k3b/android/widget/ActivityWithCallContext.java b/app/src/main/java/de/k3b/android/widget/ActivityWithCallContext.java
index aab6b8ba..e27dcb58 100644
--- a/app/src/main/java/de/k3b/android/widget/ActivityWithCallContext.java
+++ b/app/src/main/java/de/k3b/android/widget/ActivityWithCallContext.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019 by k3b.
+ * Copyright (c) 2018-2020 by k3b.
  *
  * This file is part of AndroFotoFinder and of ToGoZip.
  *
@@ -24,7 +24,6 @@
 import android.os.Bundle;
 import android.util.Log;
 
-import de.k3b.android.GuiUtil;
 import de.k3b.android.androFotoFinder.Global;
 
 /**
@@ -76,7 +75,6 @@ public static void addContext(String debugContext, Intent targetIntent, Activity
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-        GuiUtil.setTheme(this); // Almost every activity extends this so use this to set theme
         super.onCreate(savedInstanceState);
 
         if (isCallContextEnabled) {
diff --git a/app/src/main/java/de/k3b/android/widget/LocalizedActivity.java b/app/src/main/java/de/k3b/android/widget/LocalizedActivity.java
index 6ee9b8fb..0df6a22d 100644
--- a/app/src/main/java/de/k3b/android/widget/LocalizedActivity.java
+++ b/app/src/main/java/de/k3b/android/widget/LocalizedActivity.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2019 by k3b.
+ * Copyright (c) 2015-2020 by k3b.
  *
  * This file is part of AndroFotoFinder and of ToGoZip.
  *
@@ -32,6 +32,7 @@
 import java.util.Locale;
 
 import de.k3b.android.androFotoFinder.Global;
+import de.k3b.android.util.UserTheme;
 
 /**
  * An activity that can change the locale (language) of its content.
@@ -57,17 +58,16 @@ public static void setMustRecreate() {
         LocalizedActivity.currentRecreationId++;
     }
 
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        fixLocale(this);
-        super.onCreate(savedInstanceState);
-    }
-
     /**
      * Set Activity-s locale to SharedPreferences-setting.
      * Must be called before
      */
-    public static void fixLocale(Context context) {
+    public static void fixThemeAndLocale(Activity context) {
+        UserTheme.setTheme(context);
+        fixLocale(context);
+    }
+
+    private static void fixLocale(Context context) {
         final SharedPreferences prefs = PreferenceManager
                 .getDefaultSharedPreferences(context);
         String language = prefs.getString(Global.PREF_KEY_USER_LOCALE, "");
@@ -94,6 +94,12 @@ public static void fixLocale(Context context) {
         }
     }
 
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        fixThemeAndLocale(this);
+        super.onCreate(savedInstanceState);
+    }
+
     @Override
     protected void onResume() {
         super.onResume();
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 3341851a..279f93d5 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -275,4 +275,12 @@ Verstecken kann über das 'Media-Scanner' Gallery-Menü rückgängig gemacht wer
       <string name="lbl_what">What: </string>
   -->
 
+    <!-- #162: Theme support -->
+    <string name="settings_theme">Farbschema</string>
+    <string name="theme_light">Hell (Holo light)</string>
+    <string name="theme_dark">Dunkel (Holo dark)</string>
+
+    <!-- #155: android10 -->
+    <string name="load_db_menu_title">Photo.Datenbank (neu) laden</string>
+
 </resources>
diff --git a/app/src/main/res/values/arrays.xml b/app/src/main/res/values/arrays.xml
index 5582d55b..38386962 100644
--- a/app/src/main/res/values/arrays.xml
+++ b/app/src/main/res/values/arrays.xml
@@ -80,8 +80,9 @@
         <item>00000</item>
     </string-array>
 
+    <!-- #162: Theme support: R.array.pref_themes_xxx must be in same order -->
     <string-array name="pref_themes_values" translatable="false">
-        <item>Lgiht</item>
+        <item>Light</item>
         <item>Dark</item>
     </string-array>
 
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 58fe7b5b..61cc68e7 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -280,6 +280,7 @@ You can undo hiding by calling the mediascanner from gallery-menu."</string>
     <string name="lbl_what">What: </string>
 -->
 
+    <!-- #162: Theme support -->
     <string name="settings_theme">Theme</string>
     <string name="theme_light">Holo light</string>
     <string name="theme_dark">Holo dark</string>