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/security/LockscreenDashboardFragment.java

@@ -19,7 +19,6 @@ package com.android.settings.security;
 import android.app.settings.SettingsEnums;
 import android.content.Context;
 import android.hardware.display.AmbientDisplayConfiguration;
-import android.provider.SearchIndexableResource;
 
 import androidx.annotation.VisibleForTesting;
 
@@ -37,7 +36,6 @@ import com.android.settingslib.core.lifecycle.Lifecycle;
 import com.android.settingslib.search.SearchIndexable;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 
 /**
@@ -79,7 +77,7 @@ public class LockscreenDashboardFragment extends DashboardFragment
 
     @Override
     protected int getPreferenceScreenResId() {
-        return R.xml.security_lockscreen_settings;
+        return SEARCH_INDEX_DATA_PROVIDER.getXmlResourceId();
     }
 
     @Override
@@ -130,7 +128,7 @@ public class LockscreenDashboardFragment extends DashboardFragment
         return mConfig;
     }
 
-    public static final SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider(R.xml.security_lockscreen_settings) {
 
                 @Override