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/notification/NotificationAssistantPicker.java

@@ -23,18 +23,14 @@ import android.content.pm.PackageItemInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ServiceInfo;
 import android.graphics.drawable.Drawable;
-import android.os.RemoteException;
-import android.provider.SearchIndexableResource;
 import android.provider.Settings;
 import android.service.notification.NotificationAssistantService;
 import android.text.TextUtils;
-import android.util.Log;
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.settings.R;
 import com.android.settings.applications.defaultapps.DefaultAppPickerFragment;
 import com.android.settings.search.BaseSearchIndexProvider;
-import com.android.settings.search.Indexable;
 import com.android.settingslib.applications.DefaultAppInfo;
 import com.android.settingslib.applications.ServiceListing;
 import com.android.settingslib.widget.CandidateInfo;
@@ -78,7 +74,7 @@ public class NotificationAssistantPicker extends DefaultAppPickerFragment implem
 
     @Override
     protected int getPreferenceScreenResId() {
-        return R.xml.notification_assistant_settings;
+        return SEARCH_INDEX_DATA_PROVIDER.getXmlResourceId();
     }
 
     @Override
@@ -128,7 +124,7 @@ public class NotificationAssistantPicker extends DefaultAppPickerFragment implem
         mCandidateInfos = list;
     }
 
-    public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider(R.xml.notification_assistant_settings);
 
     public static class CandidateNone extends CandidateInfo {