Move some slice related api out of BasePreferenceController

And share with CustomSliceable.

Bug: 121150258
Test: rebuild
Change-Id: Ia5aed9c156fb168c1f001da6e37f7f12f191b385

src/com/android/settings/core/BasePreferenceController.java

@@ -15,7 +15,6 @@ package com.android.settings.core;
 
 import android.annotation.IntDef;
 import android.content.Context;
-import android.content.IntentFilter;
 import android.text.TextUtils;
 import android.util.Log;
 
@@ -24,6 +23,7 @@ import androidx.preference.PreferenceScreen;
 
 import com.android.settings.search.SearchIndexableRaw;
 import com.android.settings.slices.SliceData;
+import com.android.settings.slices.Sliceable;
 import com.android.settingslib.core.AbstractPreferenceController;
 
 import java.lang.annotation.Retention;
@@ -37,7 +37,8 @@ import java.util.List;
  * for Slices. The abstract classes that inherit from this class will act as the direct interfaces
  * for each type when plugging into Slices.
  */
-public abstract class BasePreferenceController extends AbstractPreferenceController {
+public abstract class BasePreferenceController extends AbstractPreferenceController implements
+        Sliceable {
 
     private static final String TAG = "SettingsPrefController";
 
@@ -226,41 +227,6 @@ public abstract class BasePreferenceController extends AbstractPreferenceControl
         return SliceData.SliceType.INTENT;
     }
 
-    /**
-     * @return an {@link IntentFilter} that includes all broadcasts which can affect the state of
-     * this Setting.
-     */
-    public IntentFilter getIntentFilter() {
-        return null;
-    }
-
-    /**
-     * Determines if the controller should be used as a Slice.
-     * <p>
-     *     Important criteria for a Slice are:
-     *     - Must be secure
-     *     - Must not be a privacy leak
-     *     - Must be understandable as a stand-alone Setting.
-     * <p>
-     *     This does not guarantee the setting is available. {@link #isAvailable()} should sill be
-     *     called.
-     *
-     * @return {@code true} if the controller should be used externally as a Slice.
-     */
-    public boolean isSliceable() {
-        return false;
-    }
-
-    /**
-     * @return {@code true} if the setting update asynchronously.
-     * <p>
-     * For example, a Wifi controller would return true, because it needs to update the radio
-     * and wait for it to turn on.
-     */
-    public boolean hasAsyncUpdate() {
-        return false;
-    }
-
     /**
      * Updates non-indexable keys for search provider.
      *
@@ -293,6 +259,7 @@ public abstract class BasePreferenceController extends AbstractPreferenceControl
 
     /**
      * Set {@link UiBlockListener}
+     *
      * @param uiBlockListener listener to set
      */
     public void setUiBlockListener(UiBlockListener uiBlockListener) {
@@ -306,6 +273,7 @@ public abstract class BasePreferenceController extends AbstractPreferenceControl
         /**
          * To notify client that UI related background work is finished.
          * (i.e. Slice is fully loaded.)
+         *
          * @param controller Controller that contains background work
          */
         void onBlockerWorkFinished(BasePreferenceController controller);
@@ -321,5 +289,6 @@ public abstract class BasePreferenceController extends AbstractPreferenceControl
      *
      * This music be used in {@link BasePreferenceController}
      */
-    public interface UiBlocker {}
+    public interface UiBlocker {
+    }
 }

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};

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

@@ -411,9 +411,7 @@ public class SettingsSliceProvider extends SliceProvider {
 
     @VisibleForTesting
     void loadSliceInBackground(Uri uri) {
-        ThreadUtils.postOnBackgroundThread(() -> {
-            loadSlice(uri);
-        });
+        ThreadUtils.postOnBackgroundThread(() -> loadSlice(uri));
     }
 
     /**

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

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.slices;
+
+import android.content.IntentFilter;
+
+/**
+ * A collection of API making a PreferenceController "sliceable"
+ */
+public interface Sliceable {
+    /**
+     * @return an {@link IntentFilter} that includes all broadcasts which can affect the state of
+     * this Setting.
+     */
+    default IntentFilter getIntentFilter() {
+        return null;
+    }
+
+    /**
+     * Determines if the controller should be used as a Slice.
+     * <p>
+     * Important criteria for a Slice are:
+     * - Must be secure
+     * - Must not be a privacy leak
+     * - Must be understandable as a stand-alone Setting.
+     * <p>
+     * This does not guarantee the setting is available.
+     *
+     * @return {@code true} if the controller should be used externally as a Slice.
+     */
+    default boolean isSliceable() {
+        return false;
+    }
+
+    /**
+     * @return {@code true} if the setting update asynchronously.
+     * <p>
+     * For example, a Wifi controller would return true, because it needs to update the radio
+     * and wait for it to turn on.
+     */
+    default boolean hasAsyncUpdate() {
+        return false;
+    }
+}