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/homepage/TopLevelSettings.java

@@ -22,7 +22,6 @@ import static com.android.settingslib.search.SearchIndexable.MOBILE;
 import android.app.settings.SettingsEnums;
 import android.content.Context;
 import android.os.Bundle;
-import android.provider.SearchIndexableResource;
 
 import androidx.fragment.app.Fragment;
 import androidx.preference.Preference;
@@ -36,9 +35,6 @@ import com.android.settings.support.SupportPreferenceController;
 import com.android.settingslib.core.instrumentation.Instrumentable;
 import com.android.settingslib.search.SearchIndexable;
 
-import java.util.Arrays;
-import java.util.List;
-
 @SearchIndexable(forTarget = MOBILE)
 public class TopLevelSettings extends DashboardFragment implements
         PreferenceFragmentCompat.OnPreferenceStartFragmentCallback {
@@ -54,7 +50,7 @@ public class TopLevelSettings extends DashboardFragment implements
 
     @Override
     protected int getPreferenceScreenResId() {
-        return R.xml.top_level_settings;
+        return SEARCH_INDEX_DATA_PROVIDER.getXmlResourceId();
     }
 
     @Override
@@ -103,7 +99,7 @@ public class TopLevelSettings extends DashboardFragment implements
                 .getBoolean(R.bool.config_force_rounded_icon_TopLevelSettings);
     }
 
-    public static final SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider(R.xml.top_level_settings) {
 
                 @Override