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diff --git a/src/org/cyanogenmod/theme/util/PreferenceUtils.java b/src/org/cyanogenmod/theme/util/PreferenceUtils.java
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+++ b/src/org/cyanogenmod/theme/util/PreferenceUtils.java
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+/*
+ * Copyright (C) 2016 Cyanogen, Inc.
+ * Copyright (C) 2016 The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.cyanogenmod.theme.util;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.pm.ThemeUtils;
+import android.content.res.Resources;
+import android.content.res.ThemeConfig;
+import android.text.TextUtils;
+import android.util.Log;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class PreferenceUtils {
+    private static final String TAG = PreferenceUtils.class.getSimpleName();
+
+    public static final String PREF_APPLIED_BASE_THEME = "applied_base_theme";
+    public static final String PREF_UPDATED_THEMES = "updated_themes";
+    public static final String PREF_NEWLY_INSTALLED_THEME_COUNT = "newly_installed_theme_count";
+    public static final String PREF_INSTALLED_THEMES_PROCESSING = "installed_themes_processing";
+    public static final String PREF_SHOW_PER_APP_THEMING_NEW_TAG = "show_per_app_new_tag";
+
+    public static SharedPreferences getSharedPreferences(Context context) {
+        if (context == null) return null;
+        return context.getSharedPreferences(context.getPackageName(), Context.MODE_PRIVATE);
+    }
+
+    public static String getAppliedBaseTheme(Context context) {
+        SharedPreferences prefs = getSharedPreferences(context);
+        if (prefs == null) return null;
+
+        final Resources res = context.getResources();
+        final ThemeConfig config = res.getConfiguration().themeConfig;
+        String appliedTheme = config != null
+                              ? config.getOverlayPkgName()
+                              : ThemeConfig.SYSTEM_DEFAULT;
+        return prefs.getString(PREF_APPLIED_BASE_THEME, appliedTheme);
+    }
+
+    public static void setAppliedBaseTheme(Context context, String pkgName) {
+        SharedPreferences prefs = getSharedPreferences(context);
+        if (prefs != null) {
+            prefs.edit().putString(PREF_APPLIED_BASE_THEME, pkgName).apply();
+        }
+    }
+
+    public static Set<String> getUpdatedThemes(Context context) {
+        SharedPreferences prefs = getSharedPreferences(context);
+        if (prefs == null) return null;
+
+        return prefs.getStringSet(PREF_UPDATED_THEMES, null);
+    }
+
+    public static void addUpdatedTheme(Context context, String pkgName) {
+        SharedPreferences prefs = getSharedPreferences(context);
+        if (prefs != null) {
+            Set<String> updatedThemes = new HashSet<String>();
+            Set<String> current = prefs.getStringSet(PREF_UPDATED_THEMES, null);
+            if (current != null) {
+                updatedThemes.addAll(current);
+            }
+            if (updatedThemes.add(pkgName)) {
+                prefs.edit().putStringSet(PREF_UPDATED_THEMES, updatedThemes).apply();
+            }
+        }
+    }
+
+    public static void removeUpdatedTheme(Context context, String pkgName) {
+        SharedPreferences prefs = getSharedPreferences(context);
+        if (prefs != null) {
+            Set<String> updatedThemes = new HashSet<String>();
+            Set<String> current = prefs.getStringSet(PREF_UPDATED_THEMES, null);
+            if (current != null) {
+                updatedThemes.addAll(current);
+            }
+            if (updatedThemes.remove(pkgName)) {
+                prefs.edit().putStringSet(PREF_UPDATED_THEMES, updatedThemes).apply();
+            }
+        }
+    }
+
+    public static boolean hasThemeBeenUpdated(Context context, String pkgName) {
+        Set<String> updatedThemes = getUpdatedThemes(context);
+        return updatedThemes != null && updatedThemes.contains(pkgName);
+    }
+
+    public static int getNewlyInstalledThemeCount(Context context) {
+        SharedPreferences prefs = getSharedPreferences(context);
+        if (prefs == null) return 0;
+
+        return prefs.getInt(PREF_NEWLY_INSTALLED_THEME_COUNT, 0);
+    }
+
+    public static void setNewlyInstalledThemeCount(Context context, int count) {
+        SharedPreferences prefs = getSharedPreferences(context);
+        if (prefs != null) {
+            prefs.edit().putInt(PREF_NEWLY_INSTALLED_THEME_COUNT, count).apply();
+        }
+    }
+
+    public static boolean getShowPerAppThemeNewTag(Context context) {
+        SharedPreferences prefs = getSharedPreferences(context);
+        if (prefs != null) {
+            return prefs.getBoolean(PREF_SHOW_PER_APP_THEMING_NEW_TAG, true);
+        }
+
+        return false;
+    }
+
+    public static void setShowPerAppThemeNewTag(Context context, boolean show) {
+        SharedPreferences prefs = getSharedPreferences(context);
+        if (prefs != null) {
+            prefs.edit().putBoolean(PREF_SHOW_PER_APP_THEMING_NEW_TAG, show).apply();
+        }
+    }
+}