Directly use BaseIndexableProvider

- Add function getXmlResourceId, Fragments don't need to write
xml resource id twice.
- Remove getPreferenceControllers from Indexable.java. Because it will
move to SettingsLib later for other apps which don't need this function

Bug: 135053028
Test: robolectric
Change-Id: I1e74519aecdea3dde64a5aea79f08d766dbc0003

src/com/android/settings/search/BaseSearchIndexProvider.java

@@ -103,7 +103,6 @@ public class BaseSearchIndexProvider implements Indexable.SearchIndexProvider {
         return nonIndexableKeys;
     }
 
-    @Override
     public List<AbstractPreferenceController> getPreferenceControllers(Context context) {
         final List<AbstractPreferenceController> controllersFromCode =
                 createPreferenceControllers(context);
@@ -135,6 +134,13 @@ public class BaseSearchIndexProvider implements Indexable.SearchIndexProvider {
         return null;
     }
 
+    /**
+     * Returns the xml resource Id.
+     */
+    public int getXmlResourceId() {
+        return mXmlRes;
+    }
+
     /**
      * Returns true if the page should be considered in search query. If return false, entire page
      * will be suppressed during search query.

src/com/android/settings/search/Indexable.java

@@ -70,12 +70,5 @@ public interface Indexable {
          */
         @Keep
         List<String> getNonIndexableKeys(Context context);
-
-        /**
-         * @return a list of {@link AbstractPreferenceController} for ResultPayload data during
-         * Indexing.
-         */
-        @Keep
-        List<AbstractPreferenceController> getPreferenceControllers(Context context);
     }
 }