Add support for saving and using the Preference's key value

- modify the SQlite data model
- update Index code for managing the key value
- pass the key when launching a Fragment or and Activity
- implement a small animation for highlighting the Preference
from a Search result

Change-Id: I617643a4e5e3b752ece8f45ce7d5429037e479da

src/com/android/settings/SettingsActivity.java

@@ -145,6 +145,11 @@ public class SettingsActivity extends Activity
      */
     public static final String EXTRA_SHOW_FRAGMENT_ARGUMENTS = ":settings:show_fragment_args";
 
+    /**
+     * Fragment "key" argument passed thru {@link #EXTRA_SHOW_FRAGMENT_ARGUMENTS}
+     */
+    public static final String EXTRA_FRAGMENT_ARG_KEY = ":settings:fragment_args_key";
+
     /**
      * When starting this activity, the invoking Intent can contain this extra
      * boolean that the header list should not be displayed.  This is most often
@@ -461,6 +466,7 @@ public class SettingsActivity extends Activity
                 final String initialTitle = getIntent().getStringExtra(EXTRA_SHOW_FRAGMENT_TITLE);
                 mInitialTitle = (initialTitle != null) ? initialTitle : getTitle();
                 setTitle(mInitialTitle);
+
                 switchToFragment( initialFragmentName, initialArguments, true, false,
                         mInitialTitle, false);
             } else {