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/accessibility/AccessibilitySettings.java

@@ -32,7 +32,6 @@ import android.os.Bundle;
 import android.os.Handler;
 import android.os.UserHandle;
 import android.provider.DeviceConfig;
-import android.provider.SearchIndexableResource;
 import android.provider.Settings;
 import android.text.TextUtils;
 import android.util.ArrayMap;
@@ -246,7 +245,7 @@ public class AccessibilitySettings extends DashboardFragment {
 
     @Override
     protected int getPreferenceScreenResId() {
-        return R.xml.accessibility_settings;
+        return SEARCH_INDEX_DATA_PROVIDER.getXmlResourceId();
     }
 
     @Override
@@ -506,6 +505,6 @@ public class AccessibilitySettings extends DashboardFragment {
         }
     }
 
-    public static final SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider(R.xml.accessibility_settings);
 }