Reland add FeatureProvider for SyncAcrossDevices Settings integration.

Prior CL ag/26930404 was reverted because an unused class was
trimmed in AOSP, causing test cases to throw NoClassDefFoundError
exceptions. This CL combines ag/26930404 and ag/26995936 to address
the failure.

Bug: 330498032
Test: atest FakeFeatureFactory, atest SyncAcrossDevicesPreferenceControllerTest
Change-Id: I0a7ebccdebcad20e06d7542d7c4a0005885f393b

src/com/android/settings/notification/syncacrossdevices/SyncAcrossDevicesFeatureCallback.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2024 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.notification.syncacrossdevices;
+
+import androidx.annotation.Nullable;
+import androidx.preference.Preference;
+
+/** Callback to add or remove {@link Preference} in Sync Across Devices feature. */
+public interface SyncAcrossDevicesFeatureCallback {
+
+    /**
+     * Called when a sync across devices feature is added
+     *
+     * @param preference present the feature
+     */
+    void onFeatureAdded(@Nullable Preference preference);
+
+    /**
+     * Called when a sync across devices feature is removed
+     *
+     * @param preference present the feature
+     */
+    void onFeatureRemoved(@Nullable Preference preference);
+}

src/com/android/settings/notification/syncacrossdevices/SyncAcrossDevicesFeatureProvider.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2024 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.notification.syncacrossdevices;
+
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+/** Feature provider for the Sync Across Devices. */
+public interface SyncAcrossDevicesFeatureProvider {
+
+    /** Returns the SyncAcrossDevicesFeatureUpdater of the Sync Across Devices feature */
+    @Nullable
+    SyncAcrossDevicesFeatureUpdater getSyncAcrossDevicesFeatureUpdater(
+            @NonNull Context context,
+            @NonNull SyncAcrossDevicesFeatureCallback featurePreferenceCallback);
+}

src/com/android/settings/notification/syncacrossdevices/SyncAcrossDevicesFeatureProviderImpl.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2024 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.notification.syncacrossdevices;
+
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+/** Default implementation for {@link SyncAcrossDevicesFeatureProvider} */
+public class SyncAcrossDevicesFeatureProviderImpl implements SyncAcrossDevicesFeatureProvider {
+
+    @Override
+    @Nullable
+    public SyncAcrossDevicesFeatureUpdater getSyncAcrossDevicesFeatureUpdater(
+            @NonNull Context context,
+            @NonNull SyncAcrossDevicesFeatureCallback featurePreferenceCallback) {
+        return new SyncAcrossDevicesFeatureUpdater() {};
+    }
+}

src/com/android/settings/notification/syncacrossdevices/SyncAcrossDevicesFeatureUpdater.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2024 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.notification.syncacrossdevices;
+
+import android.content.Context;
+
+import androidx.annotation.Nullable;
+
+/**
+ * Updates the sync across devices feature state. It notifies the upper level whether to add/remove
+ * the preference through {@link SyncAcrossDevicesFeatureCallback}
+ */
+public interface SyncAcrossDevicesFeatureUpdater {
+
+    /** Forces to update the list of the Sync Across Devices feature. */
+    default void forceUpdate() {}
+
+    /** Sets the context to generate the {@link Preference}, so it could get the correct theme. */
+    default void setPreferenceContext(@Nullable Context preferenceContext) {}
+}

src/com/android/settings/notification/syncacrossdevices/SyncAcrossDevicesPreferenceController.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2024 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.notification.syncacrossdevices;
+
+import android.content.Context;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceGroup;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settings.overlay.FeatureFactory;
+
+public class SyncAcrossDevicesPreferenceController extends BasePreferenceController
+        implements PreferenceControllerMixin, SyncAcrossDevicesFeatureCallback {
+
+    private static final String TAG = "SyncXDevicesPrefCtr";
+
+    private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
+
+    private PreferenceGroup mPreferenceGroup;
+    private SyncAcrossDevicesFeatureUpdater mSyncAcrossDevicesFeatureUpdater;
+
+    public SyncAcrossDevicesPreferenceController(@NonNull Context context, @NonNull String key) {
+        super(context, key);
+        SyncAcrossDevicesFeatureProvider syncAcrossDevicesFeatureProvider =
+                FeatureFactory.getFeatureFactory().getSyncAcrossDevicesFeatureProvider();
+        mSyncAcrossDevicesFeatureUpdater =
+                syncAcrossDevicesFeatureProvider.getSyncAcrossDevicesFeatureUpdater(context, this);
+    }
+
+    @Override
+    public void displayPreference(@NonNull PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreferenceGroup = screen.findPreference(getPreferenceKey());
+        mPreferenceGroup.setVisible(false);
+        if (isAvailable()) {
+            final Context context = screen.getContext();
+            mSyncAcrossDevicesFeatureUpdater.setPreferenceContext(context);
+            mSyncAcrossDevicesFeatureUpdater.forceUpdate();
+        }
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mSyncAcrossDevicesFeatureUpdater != null ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public void onFeatureAdded(@Nullable Preference preference) {
+        if (preference == null) {
+            if (DEBUG) {
+                Log.d(TAG, "onFeatureAdded receives null preference. Ignore.");
+            }
+            return;
+        }
+        mPreferenceGroup.addPreference(preference);
+        updatePreferenceVisibility();
+    }
+
+    @Override
+    public void onFeatureRemoved(@Nullable Preference preference) {
+        if (preference == null) {
+            if (DEBUG) {
+                Log.d(TAG, "onFeatureRemoved receives null preference. Ignore.");
+            }
+            return;
+        }
+        mPreferenceGroup.removePreference(preference);
+        updatePreferenceVisibility();
+    }
+
+    private void updatePreferenceVisibility() {
+        mPreferenceGroup.setVisible(mPreferenceGroup.getPreferenceCount() > 0);
+    }
+
+    @VisibleForTesting
+    public void setPreferenceGroup(@NonNull PreferenceGroup preferenceGroup) {
+        mPreferenceGroup = preferenceGroup;
+    }
+}

src/com/android/settings/overlay/FeatureFactory.kt

@@ -38,6 +38,7 @@ import com.android.settings.fuelgauge.PowerUsageFeatureProvider
 import com.android.settings.homepage.contextualcards.ContextualCardFeatureProvider
 import com.android.settings.inputmethod.KeyboardSettingsFeatureProvider
 import com.android.settings.localepicker.LocaleFeatureProvider
+import com.android.settings.notification.syncacrossdevices.SyncAcrossDevicesFeatureProvider
 import com.android.settings.onboarding.OnboardingFeatureProvider
 import com.android.settings.overlay.FeatureFactory.Companion.setFactory
 import com.android.settings.panel.PanelFeatureProvider
@@ -188,6 +189,11 @@ abstract class FeatureFactory {
      */
     abstract val audioSharingFeatureProvider: AudioSharingFeatureProvider
 
+    /**
+     * Gets implementation for sync across devices related feature.
+     */
+    abstract val syncAcrossDevicesFeatureProvider: SyncAcrossDevicesFeatureProvider
+
     companion object {
         private var _factory: FeatureFactory? = null
 

src/com/android/settings/overlay/FeatureFactoryImpl.kt

@@ -55,6 +55,8 @@ import com.android.settings.homepage.contextualcards.ContextualCardFeatureProvid
 import com.android.settings.inputmethod.KeyboardSettingsFeatureProvider
 import com.android.settings.inputmethod.KeyboardSettingsFeatureProviderImpl
 import com.android.settings.localepicker.LocaleFeatureProviderImpl
+import com.android.settings.notification.syncacrossdevices.SyncAcrossDevicesFeatureProvider
+import com.android.settings.notification.syncacrossdevices.SyncAcrossDevicesFeatureProviderImpl
 import com.android.settings.panel.PanelFeatureProviderImpl
 import com.android.settings.search.SearchFeatureProvider
 import com.android.settings.search.SearchFeatureProviderImpl
@@ -197,4 +199,8 @@ open class FeatureFactoryImpl : FeatureFactory() {
     override val audioSharingFeatureProvider: AudioSharingFeatureProvider by lazy {
         AudioSharingFeatureProviderImpl()
     }
+
+    override val syncAcrossDevicesFeatureProvider: SyncAcrossDevicesFeatureProvider by lazy {
+        SyncAcrossDevicesFeatureProviderImpl()
+    }
 }