Move some slice related api out of BasePreferenceController

And share with CustomSliceable.

Bug: 121150258
Test: rebuild
Change-Id: Ia5aed9c156fb168c1f001da6e37f7f12f191b385

src/com/android/settings/slices/CustomSliceable.java

@@ -52,7 +52,7 @@ import java.lang.reflect.InvocationTargetException;
  * <p>
  *     If you implement this interface, you should add your Slice to {@link CustomSliceManager}.
  */
-public interface CustomSliceable {
+public interface CustomSliceable extends Sliceable {
 
     /**
      * @return an complete instance of the {@link Slice}.
@@ -78,17 +78,6 @@ public interface CustomSliceable {
      */
     Intent getIntent();
 
-    /**
-     * Settings Slices which can represent components that are updatable by the framework should
-     * listen to changes matched to the {@link IntentFilter} returned here.
-     *
-     * @return an {@link IntentFilter} for updates related to the {@link Slice} returned by
-     * {@link #getSlice()}.
-     */
-    default IntentFilter getIntentFilter() {
-        return null;
-    }
-
     /**
      * Settings Slices which require background work, such as updating lists should implement a
      * {@link SliceBackgroundWorker} and return it here. An example of background work is updating
@@ -116,12 +105,16 @@ public interface CustomSliceable {
                 PendingIntent.FLAG_CANCEL_CURRENT);
     }
 
+    @Override
+    default boolean isSliceable() {
+        return true;
+    }
+
     /**
      * Build an instance of a {@link CustomSliceable} which has a {@link Context}-only constructor.
      */
     static CustomSliceable createInstance(Context context, Class<CustomSliceable> sliceableClass) {
         try {
-            //final Class<CustomSliceable> clazz = Class.forName(sliceableClassName);
             final Constructor<CustomSliceable> sliceable =
                     sliceableClass.getConstructor(Context.class);
             final Object[] params = new Object[]{context};