Clean up database in WidgetPreviewLoader
diff --git a/src/com/android/launcher2/AppsCustomizePagedView.java b/src/com/android/launcher2/AppsCustomizePagedView.java
index 4ff799f..49fea21 100644
--- a/src/com/android/launcher2/AppsCustomizePagedView.java
+++ b/src/com/android/launcher2/AppsCustomizePagedView.java
@@ -894,6 +894,9 @@
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
         cancelAllTasks();
+        if (mWidgetPreviewLoader != null) {
+            mWidgetPreviewLoader.closeDb();
+        }
     }
 
     public void clearAllWidgetPages() {