diff --git a/src/com/android/launcher3/AutoInstallsLayout.java b/src/com/android/launcher3/AutoInstallsLayout.java
index c7c1d6a..e5b1448 100644
--- a/src/com/android/launcher3/AutoInstallsLayout.java
+++ b/src/com/android/launcher3/AutoInstallsLayout.java
@@ -39,6 +39,7 @@
 
 import com.android.launcher3.LauncherProvider.SqlArguments;
 import com.android.launcher3.LauncherSettings.Favorites;
+import com.android.launcher3.icons.GraphicsUtils;
 import com.android.launcher3.icons.LauncherIcons;
 import com.android.launcher3.util.IntArray;
 import com.android.launcher3.util.Thunk;
@@ -47,7 +48,6 @@
 import org.xmlpull.v1.XmlPullParserException;
 
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.Locale;
 
 /**
@@ -436,7 +436,7 @@
 
             // Auto installs should always support the current platform version.
             LauncherIcons li = LauncherIcons.obtain(mContext);
-            mValues.put(LauncherSettings.Favorites.ICON, Utilities.flattenBitmap(
+            mValues.put(LauncherSettings.Favorites.ICON, GraphicsUtils.flattenBitmap(
                     li.createBadgedIconBitmap(icon, Process.myUserHandle(), VERSION.SDK_INT).icon));
             li.recycle();
 
diff --git a/src/com/android/launcher3/InstallShortcutReceiver.java b/src/com/android/launcher3/InstallShortcutReceiver.java
index 73c999a..ea59fff 100644
--- a/src/com/android/launcher3/InstallShortcutReceiver.java
+++ b/src/com/android/launcher3/InstallShortcutReceiver.java
@@ -41,6 +41,7 @@
 import com.android.launcher3.compat.LauncherAppsCompat;
 import com.android.launcher3.compat.UserManagerCompat;
 import com.android.launcher3.icons.BitmapInfo;
+import com.android.launcher3.icons.GraphicsUtils;
 import com.android.launcher3.icons.LauncherIcons;
 import com.android.launcher3.shortcuts.DeepShortcutManager;
 import com.android.launcher3.shortcuts.ShortcutInfoCompat;
@@ -457,7 +458,7 @@
                     .key(LAUNCH_INTENT_KEY).value(launchIntent.toUri(0))
                     .key(NAME_KEY).value(name);
                 if (icon != null) {
-                    byte[] iconByteArray = Utilities.flattenBitmap(icon);
+                    byte[] iconByteArray = GraphicsUtils.flattenBitmap(icon);
                     json = json.key(ICON_KEY).value(
                             Base64.encodeToString(
                                     iconByteArray, 0, iconByteArray.length, Base64.DEFAULT));
diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index d11cfcb..65f0703 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -357,25 +357,6 @@
     }
 
     /**
-     * Compresses the bitmap to a byte array for serialization.
-     */
-    public static byte[] flattenBitmap(Bitmap bitmap) {
-        // Try go guesstimate how much space the icon will take when serialized
-        // to avoid unnecessary allocations/copies during the write.
-        int size = bitmap.getWidth() * bitmap.getHeight() * 4;
-        ByteArrayOutputStream out = new ByteArrayOutputStream(size);
-        try {
-            bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
-            out.flush();
-            out.close();
-            return out.toByteArray();
-        } catch (IOException e) {
-            Log.w(TAG, "Could not write bitmap");
-            return null;
-        }
-    }
-
-    /**
      * Trims the string, removing all whitespace at the beginning and end of the string.
      * Non-breaking whitespaces are also removed.
      */
diff --git a/src/com/android/launcher3/WidgetPreviewLoader.java b/src/com/android/launcher3/WidgetPreviewLoader.java
index d47dcee..050849c 100644
--- a/src/com/android/launcher3/WidgetPreviewLoader.java
+++ b/src/com/android/launcher3/WidgetPreviewLoader.java
@@ -31,6 +31,7 @@
 import com.android.launcher3.compat.AppWidgetManagerCompat;
 import com.android.launcher3.compat.ShortcutConfigActivityInfo;
 import com.android.launcher3.compat.UserManagerCompat;
+import com.android.launcher3.icons.GraphicsUtils;
 import com.android.launcher3.icons.LauncherIcons;
 import com.android.launcher3.icons.ShadowGenerator;
 import com.android.launcher3.icons.IconCache;
@@ -149,7 +150,7 @@
         values.put(CacheDb.COLUMN_PACKAGE, key.componentName.getPackageName());
         values.put(CacheDb.COLUMN_VERSION, versions[0]);
         values.put(CacheDb.COLUMN_LAST_UPDATED, versions[1]);
-        values.put(CacheDb.COLUMN_PREVIEW_BITMAP, Utilities.flattenBitmap(preview));
+        values.put(CacheDb.COLUMN_PREVIEW_BITMAP, GraphicsUtils.flattenBitmap(preview));
         mDb.insertOrReplace(values);
     }
 
diff --git a/src/com/android/launcher3/icons/BaseIconCache.java b/src/com/android/launcher3/icons/BaseIconCache.java
index 1f810b3..9a2e287 100644
--- a/src/com/android/launcher3/icons/BaseIconCache.java
+++ b/src/com/android/launcher3/icons/BaseIconCache.java
@@ -42,13 +42,9 @@
 import android.util.Log;
 
 import com.android.launcher3.IconProvider;
-import com.android.launcher3.LauncherFiles;
 import com.android.launcher3.LauncherModel;
-import com.android.launcher3.Utilities;
-import com.android.launcher3.compat.UserManagerCompat;
 import com.android.launcher3.graphics.BitmapRenderer;
 import com.android.launcher3.util.ComponentKey;
-import com.android.launcher3.util.InstantAppResolver;
 import com.android.launcher3.util.Preconditions;
 import com.android.launcher3.util.Provider;
 import com.android.launcher3.util.SQLiteCacheHelper;
@@ -58,7 +54,7 @@
 
 import androidx.annotation.NonNull;
 
-public class BaseIconCache {
+public abstract class BaseIconCache {
 
     private static final String TAG = "BaseIconCache";
     private static final boolean DEBUG = false;
@@ -76,26 +72,24 @@
 
     private final HashMap<UserHandle, BitmapInfo> mDefaultIcons = new HashMap<>();
 
-    final Context mContext;
-    final PackageManager mPackageManager;
-    final IconProvider mIconProvider;
-    final UserManagerCompat mUserManager;
+    protected final Context mContext;
+    protected final PackageManager mPackageManager;
+    protected final IconProvider mIconProvider;
 
     private final HashMap<ComponentKey, CacheEntry> mCache =
             new HashMap<>(INITIAL_ICON_CACHE_CAPACITY);
-    private final InstantAppResolver mInstantAppResolver;
     final Handler mWorkerHandler;
 
-    int mIconDpi;
+    protected int mIconDpi;
     IconDB mIconDb;
 
+    private final String mDbFileName;
     private final BitmapFactory.Options mDecodeOptions;
 
-    public BaseIconCache(Context context, int iconDpi, int iconPixelSize) {
+    public BaseIconCache(Context context, String dbFileName, int iconDpi, int iconPixelSize) {
         mContext = context;
+        mDbFileName = dbFileName;
         mPackageManager = context.getPackageManager();
-        mUserManager = UserManagerCompat.getInstance(mContext);
-        mInstantAppResolver = InstantAppResolver.newInstance(mContext);
 
         mIconProvider = IconProvider.newInstance(context);
         mWorkerHandler = new Handler(LauncherModel.getWorkerLooper());
@@ -108,9 +102,21 @@
         }
 
         mIconDpi = iconDpi;
-        mIconDb = new IconDB(context, iconPixelSize);
+        mIconDb = new IconDB(context, dbFileName, iconPixelSize);
     }
 
+    /**
+     * Returns the persistable serial number for {@param user}. Subclass should implement proper
+     * caching strategy to avoid making binder call every time.
+     */
+    protected abstract long getSerialNumberForUser(UserHandle user);
+
+    /**
+     * Return true if the given app is an instant app and should be badged appropriately.
+     */
+    protected abstract boolean isInstantApp(ApplicationInfo info);
+
+
     public void updateIconParams(int iconDpi, int iconPixelSize) {
         mWorkerHandler.post(() -> updateIconParamsBg(iconDpi, iconPixelSize));
     }
@@ -120,13 +126,14 @@
         mDefaultIcons.clear();
 
         mIconDb.close();
-        mIconDb = new IconDB(mContext, iconPixelSize);
+        mIconDb = new IconDB(mContext, mDbFileName, iconPixelSize);
         mCache.clear();
     }
 
     private Drawable getFullResDefaultActivityIcon() {
-        return Resources.getSystem().getDrawableForDensity(Utilities.ATLEAST_OREO
-                ? android.R.drawable.sym_def_app_icon : android.R.mipmap.sym_def_app_icon,
+        return Resources.getSystem().getDrawableForDensity(
+                Build.VERSION.SDK_INT >= Build.VERSION_CODES.O
+                        ? android.R.drawable.sym_def_app_icon : android.R.mipmap.sym_def_app_icon,
                 mIconDpi);
     }
 
@@ -189,7 +196,7 @@
      */
     public synchronized void removeIconsForPkg(String packageName, UserHandle user) {
         removeFromMemCacheLocked(packageName, user);
-        long userSerial = mUserManager.getSerialNumberForUser(user);
+        long userSerial = getSerialNumberForUser(user);
         mIconDb.delete(
                 IconDB.COLUMN_COMPONENT + " LIKE ? AND " + IconDB.COLUMN_USER + " = ?",
                 new String[]{packageName + "/%", Long.toString(userSerial)});
@@ -395,7 +402,7 @@
                     // only keep the low resolution icon instead of the larger full-sized icon
                     BitmapInfo iconInfo = li.createBadgedIconBitmap(
                             appInfo.loadIcon(mPackageManager), user, appInfo.targetSdkVersion,
-                            mInstantAppResolver.isInstantApp(appInfo));
+                            isInstantApp(appInfo));
                     li.recycle();
 
                     entry.title = appInfo.loadLabel(mPackageManager);
@@ -407,8 +414,7 @@
                     // package updates.
                     ContentValues values = newContentValues(
                             iconInfo, entry.title.toString(), packageName);
-                    addIconToDB(values, cacheKey.componentName, info,
-                            mUserManager.getSerialNumberForUser(user));
+                    addIconToDB(values, cacheKey.componentName, info, getSerialNumberForUser(user));
 
                 } catch (NameNotFoundException e) {
                     if (DEBUG) Log.d(TAG, "Application not installed " + packageName);
@@ -432,7 +438,7 @@
                     IconDB.COLUMN_COMPONENT + " = ? AND " + IconDB.COLUMN_USER + " = ?",
                     new String[]{
                             cacheKey.componentName.flattenToString(),
-                            Long.toString(mUserManager.getSerialNumberForUser(cacheKey.user))});
+                            Long.toString(getSerialNumberForUser(cacheKey.user))});
             if (c.moveToNext()) {
                 // Set the alpha to be 255, so that we never have a wrong color
                 entry.color = setColorAlphaBound(c.getInt(0), 255);
@@ -485,10 +491,8 @@
         public final static String[] COLUMNS_LOW_RES = new String[] {
                 IconDB.COLUMN_ICON_COLOR, IconDB.COLUMN_LABEL };
 
-        public IconDB(Context context, int iconPixelSize) {
-            super(context, LauncherFiles.APP_ICONS_DB,
-                    (RELEASE_VERSION << 16) + iconPixelSize,
-                    TABLE_NAME);
+        public IconDB(Context context, String dbFileName, int iconPixelSize) {
+            super(context, dbFileName, (RELEASE_VERSION << 16) + iconPixelSize, TABLE_NAME);
         }
 
         @Override
@@ -510,7 +514,7 @@
     private ContentValues newContentValues(BitmapInfo bitmapInfo, String label, String packageName) {
         ContentValues values = new ContentValues();
         values.put(IconDB.COLUMN_ICON,
-                bitmapInfo.isLowRes() ? null : Utilities.flattenBitmap(bitmapInfo.icon));
+                bitmapInfo.isLowRes() ? null : GraphicsUtils.flattenBitmap(bitmapInfo.icon));
         values.put(IconDB.COLUMN_ICON_COLOR, bitmapInfo.color);
 
         values.put(IconDB.COLUMN_LABEL, label);
diff --git a/src/com/android/launcher3/icons/IconCache.java b/src/com/android/launcher3/icons/IconCache.java
index e10ff5b..9c0a363 100644
--- a/src/com/android/launcher3/icons/IconCache.java
+++ b/src/com/android/launcher3/icons/IconCache.java
@@ -18,6 +18,7 @@
 
 import android.content.Context;
 import android.content.Intent;
+import android.content.pm.ApplicationInfo;
 import android.content.pm.LauncherActivityInfo;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
@@ -31,13 +32,16 @@
 import com.android.launcher3.AppInfo;
 import com.android.launcher3.InvariantDeviceProfile;
 import com.android.launcher3.ItemInfoWithIcon;
+import com.android.launcher3.LauncherFiles;
 import com.android.launcher3.LauncherModel;
 import com.android.launcher3.MainThreadExecutor;
 import com.android.launcher3.ShortcutInfo;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.compat.LauncherAppsCompat;
+import com.android.launcher3.compat.UserManagerCompat;
 import com.android.launcher3.icons.ComponentWithLabel.ComponentCachingLogic;
 import com.android.launcher3.model.PackageItemInfo;
+import com.android.launcher3.util.InstantAppResolver;
 import com.android.launcher3.util.Preconditions;
 import com.android.launcher3.util.Provider;
 
@@ -56,15 +60,28 @@
     private final CachingLogic<LauncherActivityInfo> mLauncherActivityInfoCachingLogic;
 
     private final LauncherAppsCompat mLauncherApps;
+    private final UserManagerCompat mUserManager;
+    private final InstantAppResolver mInstantAppResolver;
 
     private int mPendingIconRequestCount = 0;
 
     public IconCache(Context context, InvariantDeviceProfile inv) {
-        super(context, inv.fillResIconDpi, inv.iconBitmapSize);
+        super(context, LauncherFiles.APP_ICONS_DB, inv.fillResIconDpi, inv.iconBitmapSize);
         mComponentWithLabelCachingLogic = new ComponentCachingLogic(context);
         mLauncherActivityInfoCachingLogic = new LauncherActivtiyCachingLogic(this);
         mLauncherApps = LauncherAppsCompat.getInstance(mContext);
+        mUserManager = UserManagerCompat.getInstance(mContext);
+        mInstantAppResolver = InstantAppResolver.newInstance(mContext);
+    }
 
+    @Override
+    protected long getSerialNumberForUser(UserHandle user) {
+        return mUserManager.getSerialNumberForUser(user);
+    }
+
+    @Override
+    protected boolean isInstantApp(ApplicationInfo info) {
+        return mInstantAppResolver.isInstantApp(info);
     }
 
     /**
diff --git a/src/com/android/launcher3/icons/IconCacheUpdateHandler.java b/src/com/android/launcher3/icons/IconCacheUpdateHandler.java
index 07451b9..c679da4 100644
--- a/src/com/android/launcher3/icons/IconCacheUpdateHandler.java
+++ b/src/com/android/launcher3/icons/IconCacheUpdateHandler.java
@@ -131,7 +131,7 @@
         if (ignorePackages == null) {
             ignorePackages = Collections.emptySet();
         }
-        long userSerial = mIconCache.mUserManager.getSerialNumberForUser(user);
+        long userSerial = mIconCache.getSerialNumberForUser(user);
 
         Stack<T> appsToUpdate = new Stack<>();
 
diff --git a/src/com/android/launcher3/util/ContentWriter.java b/src/com/android/launcher3/util/ContentWriter.java
index 4384328..00adf10 100644
--- a/src/com/android/launcher3/util/ContentWriter.java
+++ b/src/com/android/launcher3/util/ContentWriter.java
@@ -25,8 +25,8 @@
 
 import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.LauncherSettings;
-import com.android.launcher3.Utilities;
 import com.android.launcher3.compat.UserManagerCompat;
+import com.android.launcher3.icons.GraphicsUtils;
 
 /**
  * A wrapper around {@link ContentValues} with some utility methods.
@@ -97,7 +97,7 @@
         Preconditions.assertNonUiThread();
         if (mIcon != null && !LauncherAppState.getInstance(context).getIconCache()
                 .isDefaultIcon(mIcon, mUser)) {
-            mValues.put(LauncherSettings.Favorites.ICON, Utilities.flattenBitmap(mIcon));
+            mValues.put(LauncherSettings.Favorites.ICON, GraphicsUtils.flattenBitmap(mIcon));
             mIcon = null;
         }
         return mValues;