Create a central list of files the Launcher writes to the app directory

Replace hardcoded Launcher filenames with the defined constants.

Bug: 12753154
Change-Id: I072f202d9388a703b9e6851bde64ea7fafe4b10a

src/com/android/launcher3/LauncherFiles.java

@@ -0,0 +1,27 @@
+package com.android.launcher3;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Central list of files the Launcher writes to the application data directory.
+ *
+ * To add a new Launcher file, create a String constant referring to the filename, and add it to
+ * ALL_FILES, as shown below.
+ */
+public class LauncherFiles {
+
+    public static final String SHARED_PREFS = "com.android.launcher3.prefs.xml";
+    public static final String LAUNCHER_DB = "launcher.db";
+    public static final String LAUNCHER_PREFS = "launcher.preferences";
+    public static final String WALLPAPER_IMAGES_DB = "saved_wallpaper_images.db";
+    public static final String WIDGET_PREVIEWS_DB = "widgetpreviews.db";
+
+    public static final List<String> ALL_FILES = Collections.unmodifiableList(Arrays.asList(
+            SHARED_PREFS,
+            LAUNCHER_DB,
+            LAUNCHER_PREFS,
+            WALLPAPER_IMAGES_DB,
+            WIDGET_PREVIEWS_DB));
+}