diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 29f69b8..48b1333 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -100,6 +100,7 @@
     <uses-permission android:name="android.permission.USE_RESERVED_DISK" />
     <uses-permission android:name="android.permission.MANAGE_SCOPED_ACCESS_DIRECTORY_PERMISSIONS" />
     <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.MEDIA_CONTENT_CONTROL" />
 
     <application android:label="@string/settings_label"
             android:icon="@drawable/ic_launcher_settings"
diff --git a/res/layout/search_bar.xml b/res/layout/search_bar.xml
index 64ddb6d..dbd61df 100644
--- a/res/layout/search_bar.xml
+++ b/res/layout/search_bar.xml
@@ -27,6 +27,7 @@
         android:id="@+id/search_action_bar"
         android:layout_width="match_parent"
         android:layout_height="@dimen/search_bar_height"
+        android:layout_marginStart="-2dp"
         android:background="?android:attr/selectableItemBackground"
         android:contentInsetStartWithNavigation="@dimen/search_bar_content_inset"
         android:navigationIcon="@drawable/ic_homepage_search">
diff --git a/res/values/arrays.xml b/res/values/arrays.xml
index 03e40aa..6a03582 100644
--- a/res/values/arrays.xml
+++ b/res/values/arrays.xml
@@ -1268,7 +1268,7 @@
         <item>NV</item>
     </string-array>
     <!-- Values for CDMA subscription-->
-    <string-array name="cdma_subscription_values">
+    <string-array name="cdma_subscription_values" translatable="false">
         <item>"0"</item>
         <item>"1"</item>
     </string-array>
@@ -1351,7 +1351,7 @@
         <item>LTE / GSM / UMTS</item>
     </string-array>
 
-    <string-array name="preferred_network_mode_values_world_mode">
+    <string-array name="preferred_network_mode_values_world_mode" translatable="false">
         <item>"10"</item>
         <item>"8"</item>
         <item>"9"</item>
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 0d6eaeb..1bbeb63 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -2489,7 +2489,7 @@
         <item>Mobile</item>
         <item>Wi-Fi only</item>
     </string-array>
-    <string-array name="wifi_calling_mode_values">
+    <string-array name="wifi_calling_mode_values" translatable="false">
         <item>"2"</item>
         <item>"1"</item>
         <item>"0"</item>
@@ -2502,7 +2502,7 @@
         <item>Wi-Fi</item>
         <item>Mobile</item>
     </string-array>
-    <string-array name="wifi_calling_mode_values_without_wifi_only">
+    <string-array name="wifi_calling_mode_values_without_wifi_only" translatable="false">
         <item>"2"</item>
         <item>"1"</item>
     </string-array>
@@ -7001,7 +7001,7 @@
     <!-- Title for setting tile leading to Apps & Notification settings [CHAR LIMIT=40]-->
     <string name="app_and_notification_dashboard_title">Apps &amp; notifications</string>
     <!-- Summary for Apps & Notification settings, explaining a few important settings under it [CHAR LIMIT=NONE]-->
-    <string name="app_and_notification_dashboard_summary">Permissions, default apps</string>
+    <string name="app_and_notification_dashboard_summary">Assistant, recent apps, default apps</string>
     <!-- Toast shown when an app in the work profile attempts to open notification settings. The apps in the work profile cannot access notification settings. [CHAR LIMIT=NONE] -->
     <string name="notification_settings_work_profile">Notification access is not available for apps in the work profile.</string>
     <!-- Title for setting tile leading to account settings [CHAR LIMIT=40]-->
@@ -7193,6 +7193,9 @@
     <!-- Sound: Title for the option managing media volume. [CHAR LIMIT=30] -->
     <string name="media_volume_option_title">Media volume</string>
 
+    <!-- Sound: Title for the option managing remote media volume. [CHAR LIMIT=30] -->
+    <string name="remote_media_volume_option_title">Cast volume</string>
+
     <!-- Sound: Title for the option managing call volume. [CHAR LIMIT=30] -->
     <string name="call_volume_option_title">Call volume</string>
 
diff --git a/res/xml/sound_settings.xml b/res/xml/sound_settings.xml
index ee8613d..81a0453 100644
--- a/res/xml/sound_settings.xml
+++ b/res/xml/sound_settings.xml
@@ -22,6 +22,15 @@
     settings:keywords="@string/keywords_sounds"
     settings:initialExpandedChildrenCount="9">
 
+    <!-- Remote volume -->
+    <com.android.settings.notification.RemoteVolumeSeekBarPreference
+        android:key="remote_volume"
+        android:icon="@drawable/ic_volume_remote"
+        android:title="@string/remote_media_volume_option_title"
+        android:order="-185"
+        settings:allowDynamicSummaryInSlice="true"
+        settings:controller="com.android.settings.notification.RemoteVolumePreferenceController"/>
+
     <!-- Media volume -->
     <com.android.settings.notification.VolumeSeekBarPreference
         android:key="media_volume"
diff --git a/src/com/android/settings/notification/RemoteVolumePreferenceController.java b/src/com/android/settings/notification/RemoteVolumePreferenceController.java
new file mode 100644
index 0000000..0ad307e
--- /dev/null
+++ b/src/com/android/settings/notification/RemoteVolumePreferenceController.java
@@ -0,0 +1,261 @@
+/*
+ * 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.notification;
+
+import android.content.Context;
+import android.media.session.MediaController;
+import android.media.session.MediaSession;
+import android.media.session.MediaSessionManager;
+import android.net.Uri;
+import android.os.Looper;
+import android.text.TextUtils;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.lifecycle.OnLifecycleEvent;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.slices.SliceBackgroundWorker;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+import com.android.settingslib.volume.MediaSessions;
+
+import java.io.IOException;
+import java.util.List;
+
+public class RemoteVolumePreferenceController extends
+    VolumeSeekBarPreferenceController {
+
+    private static final String KEY_REMOTE_VOLUME = "remote_volume";
+    @VisibleForTesting
+    static final int REMOTE_VOLUME = 100;
+
+    private MediaSessionManager mMediaSessionManager;
+    private MediaSessions mMediaSessions;
+    @VisibleForTesting
+    MediaSession.Token mActiveToken;
+    @VisibleForTesting
+    MediaController mMediaController;
+
+    @VisibleForTesting
+    MediaSessions.Callbacks mCallbacks = new MediaSessions.Callbacks() {
+        @Override
+        public void onRemoteUpdate(MediaSession.Token token, String name,
+                MediaController.PlaybackInfo pi) {
+            if (mActiveToken == null) {
+                updateToken(token);
+            }
+            if (mActiveToken == token) {
+                updatePreference(mPreference, mActiveToken, pi);
+            }
+        }
+
+        @Override
+        public void onRemoteRemoved(MediaSession.Token t) {
+            if (mActiveToken == t) {
+                updateToken(null);
+                if (mPreference != null) {
+                    mPreference.setVisible(false);
+                }
+            }
+        }
+
+        @Override
+        public void onRemoteVolumeChanged(MediaSession.Token token, int flags) {
+            if (mActiveToken == token) {
+                final MediaController.PlaybackInfo pi = mMediaController.getPlaybackInfo();
+                if (pi != null) {
+                    setSliderPosition(pi.getCurrentVolume());
+                }
+            }
+        }
+    };
+
+    public RemoteVolumePreferenceController(Context context) {
+        super(context, KEY_REMOTE_VOLUME);
+        mMediaSessionManager = context.getSystemService(MediaSessionManager.class);
+        mMediaSessions = new MediaSessions(context, Looper.getMainLooper(), mCallbacks);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        final List<MediaController> controllers = mMediaSessionManager.getActiveSessions(null);
+        for (MediaController mediaController : controllers) {
+            final MediaController.PlaybackInfo pi = mediaController.getPlaybackInfo();
+            if (isRemote(pi)) {
+                updateToken(mediaController.getSessionToken());
+                return AVAILABLE;
+            }
+        }
+
+        // No active remote media at this point
+        return CONDITIONALLY_UNAVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        if (mMediaController != null) {
+            updatePreference(mPreference, mActiveToken, mMediaController.getPlaybackInfo());
+        }
+    }
+
+    @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
+    public void onResume() {
+        super.onResume();
+        //TODO(b/126199571): register callback once b/126890783 is fixed
+    }
+
+    @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
+    public void onPause() {
+        super.onPause();
+        //TODO(b/126199571): unregister callback once b/126890783 is fixed
+    }
+
+    @Override
+    public int getSliderPosition() {
+        if (mPreference != null) {
+            return mPreference.getProgress();
+        }
+        if (mMediaController == null) {
+            return 0;
+        }
+        final MediaController.PlaybackInfo playbackInfo = mMediaController.getPlaybackInfo();
+        return playbackInfo != null ? playbackInfo.getCurrentVolume() : 0;
+    }
+
+    @Override
+    public boolean setSliderPosition(int position) {
+        if (mPreference != null) {
+            mPreference.setProgress(position);
+        }
+        if (mMediaController == null) {
+            return false;
+        }
+        mMediaController.setVolumeTo(position, 0);
+        return true;
+    }
+
+    @Override
+    public int getMaxSteps() {
+        if (mPreference != null) {
+            return mPreference.getMax();
+        }
+        if (mMediaController == null) {
+            return 0;
+        }
+        final MediaController.PlaybackInfo playbackInfo = mMediaController.getPlaybackInfo();
+        return playbackInfo != null ? playbackInfo.getMaxVolume() : 0;
+    }
+
+    @Override
+    public boolean isSliceable() {
+        return TextUtils.equals(getPreferenceKey(), KEY_REMOTE_VOLUME);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_REMOTE_VOLUME;
+    }
+
+    @Override
+    public int getAudioStream() {
+        // This can be anything because remote volume controller doesn't rely on it.
+        return REMOTE_VOLUME;
+    }
+
+    @Override
+    public int getMuteIcon() {
+        return R.drawable.ic_volume_remote_mute;
+    }
+
+    public static boolean isRemote(MediaController.PlaybackInfo pi) {
+        return pi != null
+                && pi.getPlaybackType() == MediaController.PlaybackInfo.PLAYBACK_TYPE_REMOTE;
+    }
+
+    @Override
+    public Class<? extends SliceBackgroundWorker> getBackgroundWorkerClass() {
+        //TODO(b/126199571): return RemoteVolumeSliceWorker once b/126890783 is fixed
+        return null;
+    }
+
+    private void updatePreference(VolumeSeekBarPreference seekBarPreference,
+            MediaSession.Token token, MediaController.PlaybackInfo playbackInfo) {
+        if (seekBarPreference == null || token == null || playbackInfo == null) {
+            return;
+        }
+
+        seekBarPreference.setMax(playbackInfo.getMaxVolume());
+        seekBarPreference.setVisible(true);
+        setSliderPosition(playbackInfo.getCurrentVolume());
+    }
+
+    private void updateToken(MediaSession.Token token) {
+        mActiveToken = token;
+        if (token != null) {
+            mMediaController = new MediaController(mContext, mActiveToken);
+        } else {
+            mMediaController = null;
+        }
+    }
+
+    /**
+     * Listener for background change to remote volume, which listens callback
+     * from {@code MediaSessions}
+     */
+    public static class RemoteVolumeSliceWorker extends SliceBackgroundWorker<Void> implements
+            MediaSessions.Callbacks {
+
+        private MediaSessions mMediaSessions;
+
+        public RemoteVolumeSliceWorker(Context context, Uri uri) {
+            super(context, uri);
+            mMediaSessions = new MediaSessions(context, Looper.getMainLooper(), this);
+        }
+
+        @Override
+        protected void onSlicePinned() {
+            mMediaSessions.init();
+        }
+
+        @Override
+        protected void onSliceUnpinned() {
+            mMediaSessions.destroy();
+        }
+
+        @Override
+        public void close() throws IOException {
+            mMediaSessions = null;
+        }
+
+        @Override
+        public void onRemoteUpdate(MediaSession.Token token, String name,
+                MediaController.PlaybackInfo pi) {
+            notifySliceChange();
+        }
+
+        @Override
+        public void onRemoteRemoved(MediaSession.Token t) {
+            notifySliceChange();
+        }
+
+        @Override
+        public void onRemoteVolumeChanged(MediaSession.Token token, int flags) {
+            notifySliceChange();
+        }
+    }
+}
diff --git a/src/com/android/settings/notification/RemoteVolumeSeekBarPreference.java b/src/com/android/settings/notification/RemoteVolumeSeekBarPreference.java
new file mode 100644
index 0000000..e99af6a
--- /dev/null
+++ b/src/com/android/settings/notification/RemoteVolumeSeekBarPreference.java
@@ -0,0 +1,56 @@
+/*
+ * 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.notification;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+/**
+ * A slider preference that controls remote volume, which doesn't go through
+ * {@link android.media.AudioManager}
+ **/
+public class RemoteVolumeSeekBarPreference extends VolumeSeekBarPreference {
+
+    public RemoteVolumeSeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr,
+            int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    public RemoteVolumeSeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public RemoteVolumeSeekBarPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public RemoteVolumeSeekBarPreference(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void setStream(int stream) {
+        // Do nothing here, volume is not controlled by AudioManager
+    }
+
+    @Override
+    protected void init() {
+        if (mSeekBar == null) return;
+        updateIconView();
+        updateSuppressionText();
+    }
+}
diff --git a/src/com/android/settings/notification/SoundSettings.java b/src/com/android/settings/notification/SoundSettings.java
index e8b7ee0..b26b921 100644
--- a/src/com/android/settings/notification/SoundSettings.java
+++ b/src/com/android/settings/notification/SoundSettings.java
@@ -184,6 +184,7 @@
         volumeControllers.add(use(RingVolumePreferenceController.class));
         volumeControllers.add(use(NotificationVolumePreferenceController.class));
         volumeControllers.add(use(CallVolumePreferenceController.class));
+        volumeControllers.add(use(RemoteVolumePreferenceController.class));
 
         use(MediaOutputPreferenceController.class).setCallback(listPreference ->
                 onPreferenceDataChanged(listPreference));
diff --git a/src/com/android/settings/notification/VolumeSeekBarPreference.java b/src/com/android/settings/notification/VolumeSeekBarPreference.java
index 13f6300..7f36791 100644
--- a/src/com/android/settings/notification/VolumeSeekBarPreference.java
+++ b/src/com/android/settings/notification/VolumeSeekBarPreference.java
@@ -40,8 +40,8 @@
 public class VolumeSeekBarPreference extends SeekBarPreference {
     private static final String TAG = "VolumeSeekBarPreference";
 
+    protected SeekBar mSeekBar;
     private int mStream;
-    private SeekBar mSeekBar;
     private SeekBarVolumizer mVolumizer;
     private Callback mCallback;
     private ImageView mIconView;
@@ -121,7 +121,7 @@
         init();
     }
 
-    private void init() {
+    protected void init() {
         if (mSeekBar == null) return;
         final SeekBarVolumizer.Callback sbvc = new SeekBarVolumizer.Callback() {
             @Override
@@ -158,7 +158,7 @@
         }
     }
 
-    private void updateIconView() {
+    protected void updateIconView() {
         if (mIconView == null) return;
         if (mIconResId != 0) {
             mIconView.setImageResource(mIconResId);
@@ -195,7 +195,7 @@
         updateSuppressionText();
     }
 
-    private void updateSuppressionText() {
+    protected void updateSuppressionText() {
         if (mSuppressionTextView != null && mSeekBar != null) {
             mSuppressionTextView.setText(mSuppressionText);
             final boolean showSuppression = !TextUtils.isEmpty(mSuppressionText);
diff --git a/src/com/android/settings/panel/VolumePanel.java b/src/com/android/settings/panel/VolumePanel.java
index 20c2272..62eca53 100644
--- a/src/com/android/settings/panel/VolumePanel.java
+++ b/src/com/android/settings/panel/VolumePanel.java
@@ -19,6 +19,7 @@
 import static com.android.settings.slices.CustomSliceRegistry.VOLUME_ALARM_URI;
 import static com.android.settings.slices.CustomSliceRegistry.VOLUME_CALL_URI;
 import static com.android.settings.slices.CustomSliceRegistry.VOLUME_MEDIA_URI;
+import static com.android.settings.slices.CustomSliceRegistry.VOLUME_REMOTE_MEDIA_URI;
 import static com.android.settings.slices.CustomSliceRegistry.VOLUME_RINGER_URI;
 
 import android.app.settings.SettingsEnums;
@@ -52,6 +53,7 @@
     @Override
     public List<Uri> getSlices() {
         final List<Uri> uris = new ArrayList<>();
+        uris.add(VOLUME_REMOTE_MEDIA_URI);
         uris.add(VOLUME_MEDIA_URI);
         uris.add(VOLUME_CALL_URI);
         uris.add(VOLUME_RINGER_URI);
diff --git a/src/com/android/settings/privacy/PermissionBarChartPreferenceController.java b/src/com/android/settings/privacy/PermissionBarChartPreferenceController.java
index 453cdbf..704d1e5 100644
--- a/src/com/android/settings/privacy/PermissionBarChartPreferenceController.java
+++ b/src/com/android/settings/privacy/PermissionBarChartPreferenceController.java
@@ -167,7 +167,8 @@
             barViewInfos[index] = new BarViewInfo(
                     getPermissionGroupIcon(permissionGroupInfo.getName()),
                     permissionGroupInfo.getAppAccessCount(),
-                    R.string.storage_detail_apps);
+                    R.string.storage_detail_apps,
+                    getPermissionGroupLabel(permissionGroupInfo.getName()));
 
             // Set the click listener for each bar view.
             // The listener will navigate user to permission usage app.
@@ -194,6 +195,18 @@
         return icon;
     }
 
+    private CharSequence getPermissionGroupLabel(CharSequence permissionGroup) {
+        CharSequence label = null;
+        try {
+            label = mPackageManager.getPermissionGroupInfo(permissionGroup.toString(), 0)
+                    .loadLabel(mPackageManager);
+        } catch (PackageManager.NameNotFoundException e) {
+            Log.w(TAG, "Cannot find group label for " + permissionGroup, e);
+        }
+
+        return label;
+    }
+
     private boolean areSamePermissionGroups(List<RuntimePermissionUsageInfo> newUsageInfos) {
         if (newUsageInfos.size() != mOldUsageInfos.size()) {
             return false;
diff --git a/src/com/android/settings/slices/CustomSliceRegistry.java b/src/com/android/settings/slices/CustomSliceRegistry.java
index ab1b248..3a1db69 100644
--- a/src/com/android/settings/slices/CustomSliceRegistry.java
+++ b/src/com/android/settings/slices/CustomSliceRegistry.java
@@ -219,6 +219,17 @@
             .appendPath(SettingsSlicesContract.PATH_SETTING_ACTION)
             .appendPath("media_volume")
             .build();
+
+    /**
+     * Full {@link Uri} for the Remote Media Volume Slice.
+     */
+    public static final Uri VOLUME_REMOTE_MEDIA_URI = new Uri.Builder()
+            .scheme(ContentResolver.SCHEME_CONTENT)
+            .authority(SettingsSliceProvider.SLICE_AUTHORITY)
+            .appendPath(SettingsSlicesContract.PATH_SETTING_ACTION)
+            .appendPath("remote_volume")
+            .build();
+
     /**
      * Full {@link Uri} for the Ringer volume Slice.
      */
diff --git a/src/com/android/settings/wifi/calling/WifiCallingSettingsForSub.java b/src/com/android/settings/wifi/calling/WifiCallingSettingsForSub.java
index 79112c7..6fe1795 100644
--- a/src/com/android/settings/wifi/calling/WifiCallingSettingsForSub.java
+++ b/src/com/android/settings/wifi/calling/WifiCallingSettingsForSub.java
@@ -90,6 +90,7 @@
     private boolean mValidListener = false;
     private boolean mEditableWfcMode = true;
     private boolean mEditableWfcRoamingMode = true;
+    private boolean mUseWfcHomeModeForRoaming = false;
 
     private int mSubId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;
     private ImsManager mImsManager;
@@ -317,6 +318,9 @@
                         CarrierConfigManager.KEY_EDITABLE_WFC_MODE_BOOL);
                 mEditableWfcRoamingMode = b.getBoolean(
                         CarrierConfigManager.KEY_EDITABLE_WFC_ROAMING_MODE_BOOL);
+                mUseWfcHomeModeForRoaming = b.getBoolean(
+                        CarrierConfigManager.KEY_USE_WFC_HOME_NETWORK_MODE_IN_ROAMING_NETWORK_BOOL,
+                        false);
                 isWifiOnlySupported = b.getBoolean(
                         CarrierConfigManager.KEY_CARRIER_WFC_SUPPORTS_WIFI_ONLY_BOOL, true);
             }
@@ -499,7 +503,7 @@
                 // Don't show WFC (home) preference if it's not editable.
                 preferenceScreen.removePreference(mButtonWfcMode);
             }
-            if (mEditableWfcRoamingMode) {
+            if (mEditableWfcRoamingMode && !mUseWfcHomeModeForRoaming) {
                 preferenceScreen.addPreference(mButtonWfcRoamingMode);
             } else {
                 // Don't show WFC roaming preference if it's not editable.
@@ -528,10 +532,8 @@
                 mImsManager.setWfcMode(buttonMode, false);
                 mButtonWfcMode.setSummary(getWfcModeSummary(buttonMode));
                 mMetricsFeatureProvider.action(getActivity(), getMetricsCategory(), buttonMode);
-            }
-            if (!mEditableWfcRoamingMode) {
-                int currentWfcRoamingMode = mImsManager.getWfcMode(true);
-                if (buttonMode != currentWfcRoamingMode) {
+
+                if (mUseWfcHomeModeForRoaming) {
                     mImsManager.setWfcMode(buttonMode, true);
                     // mButtonWfcRoamingMode.setSummary is not needed; summary is selected value
                 }
diff --git a/tests/robotests/src/com/android/settings/notification/RemoteVolumePreferenceControllerTest.java b/tests/robotests/src/com/android/settings/notification/RemoteVolumePreferenceControllerTest.java
new file mode 100644
index 0000000..1bf2fd8
--- /dev/null
+++ b/tests/robotests/src/com/android/settings/notification/RemoteVolumePreferenceControllerTest.java
@@ -0,0 +1,197 @@
+/*
+ * 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.notification;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.media.session.ControllerLink;
+import android.media.session.MediaController;
+import android.media.session.MediaSession;
+import android.media.session.MediaSessionManager;
+
+import com.android.settings.R;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RunWith(RobolectricTestRunner.class)
+public class RemoteVolumePreferenceControllerTest {
+    private static final int CURRENT_POS = 5;
+    private static final int MAX_POS = 10;
+
+    @Mock
+    private MediaSessionManager mMediaSessionManager;
+    @Mock
+    private MediaController mMediaController;
+    @Mock
+    private ControllerLink.ControllerStub mStub;
+    @Mock
+    private ControllerLink.ControllerStub mStub2;
+    private MediaSession.Token mToken;
+    private MediaSession.Token mToken2;
+    private RemoteVolumePreferenceController mController;
+    private Context mContext;
+    private List<MediaController> mActiveSessions;
+    private MediaController.PlaybackInfo mPlaybackInfo;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = spy(RuntimeEnvironment.application);
+        when(mContext.getSystemService(MediaSessionManager.class)).thenReturn(mMediaSessionManager);
+        mActiveSessions = new ArrayList<>();
+        mActiveSessions.add(mMediaController);
+        when(mMediaSessionManager.getActiveSessions(null)).thenReturn(
+                mActiveSessions);
+        mToken = new MediaSession.Token(new ControllerLink(mStub));
+        mToken2 = new MediaSession.Token(new ControllerLink(mStub2));
+
+        mController = new RemoteVolumePreferenceController(mContext);
+        mPlaybackInfo = new MediaController.PlaybackInfo(
+                MediaController.PlaybackInfo.PLAYBACK_TYPE_REMOTE, 0, MAX_POS, CURRENT_POS, null);
+        when(mMediaController.getPlaybackInfo()).thenReturn(mPlaybackInfo);
+    }
+
+    @Test
+    public void isAvailable_containRemoteMedia_returnTrue() {
+        when(mMediaController.getPlaybackInfo()).thenReturn(
+                new MediaController.PlaybackInfo(MediaController.PlaybackInfo.PLAYBACK_TYPE_REMOTE,
+                        0, 0, 0, null));
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void isAvailable_noRemoteMedia_returnFalse() {
+        when(mMediaController.getPlaybackInfo()).thenReturn(
+                new MediaController.PlaybackInfo(MediaController.PlaybackInfo.PLAYBACK_TYPE_LOCAL,
+                        0, 0, 0, null));
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
+    @Test
+    public void getMuteIcon_returnMuteIcon() {
+        assertThat(mController.getMuteIcon()).isEqualTo(R.drawable.ic_volume_remote_mute);
+    }
+
+    @Test
+    public void getAudioStream_returnRemoteVolume() {
+        assertThat(mController.getAudioStream()).isEqualTo(
+                RemoteVolumePreferenceController.REMOTE_VOLUME);
+    }
+
+    @Test
+    public void getSliderPosition_controllerNull_returnZero() {
+        mController.mMediaController = null;
+
+        assertThat(mController.getSliderPosition()).isEqualTo(0);
+    }
+
+    @Test
+    public void getSliderPosition_controllerExists_returnValue() {
+        mController.mMediaController = mMediaController;
+
+        assertThat(mController.getSliderPosition()).isEqualTo(CURRENT_POS);
+    }
+
+    @Test
+    public void getMaxSteps_controllerNull_returnZero() {
+        mController.mMediaController = null;
+
+        assertThat(mController.getMaxSteps()).isEqualTo(0);
+    }
+
+    @Test
+    public void getMaxSteps_controllerExists_returnValue() {
+        mController.mMediaController = mMediaController;
+
+        assertThat(mController.getMaxSteps()).isEqualTo(MAX_POS);
+    }
+
+    @Test
+    public void setSliderPosition_controllerNull_returnFalse() {
+        mController.mMediaController = null;
+
+        assertThat(mController.setSliderPosition(CURRENT_POS)).isFalse();
+    }
+
+    @Test
+    public void setSliderPosition_controllerExists_returnTrue() {
+        mController.mMediaController = mMediaController;
+
+        assertThat(mController.setSliderPosition(CURRENT_POS)).isTrue();
+        verify(mMediaController).setVolumeTo(CURRENT_POS, 0 /* flags */);
+    }
+
+    @Test
+    public void onRemoteUpdate_firstToken_updateTokenAndPreference() {
+        mController.mPreference = new VolumeSeekBarPreference(mContext);
+        mController.mActiveToken = null;
+
+        mController.mCallbacks.onRemoteUpdate(mToken, "token", mPlaybackInfo);
+
+        assertThat(mController.mActiveToken).isEqualTo(mToken);
+        assertThat(mController.mPreference.isVisible()).isTrue();
+        assertThat(mController.mPreference.getMax()).isEqualTo(MAX_POS);
+        assertThat(mController.mPreference.getProgress()).isEqualTo(CURRENT_POS);
+    }
+
+    @Test
+    public void onRemoteUpdate_differentToken_doNothing() {
+        mController.mActiveToken = mToken;
+
+        mController.mCallbacks.onRemoteUpdate(mToken2, "token2", mPlaybackInfo);
+
+        assertThat(mController.mActiveToken).isEqualTo(mToken);
+    }
+
+    @Test
+    public void onRemoteRemoved_tokenRemoved_setInvisible() {
+        mController.mPreference = new VolumeSeekBarPreference(mContext);
+        mController.mActiveToken = mToken;
+
+        mController.mCallbacks.onRemoteRemoved(mToken);
+
+        assertThat(mController.mActiveToken).isNull();
+        assertThat(mController.mPreference.isVisible()).isFalse();
+    }
+
+    @Test
+    public void onRemoteVolumeChanged_volumeChanged_updateIt() {
+        mController.mPreference = new VolumeSeekBarPreference(mContext);
+        mController.mPreference.setMax(MAX_POS);
+        mController.mActiveToken = mToken;
+        mController.mMediaController = mMediaController;
+
+        mController.mCallbacks.onRemoteVolumeChanged(mToken, 0 /* flags */);
+
+        assertThat(mController.mPreference.getProgress()).isEqualTo(CURRENT_POS);
+    }
+}
diff --git a/tests/robotests/src/com/android/settings/wifi/calling/WifiCallingSettingsForSubTest.java b/tests/robotests/src/com/android/settings/wifi/calling/WifiCallingSettingsForSubTest.java
index c8b3920..39de254 100644
--- a/tests/robotests/src/com/android/settings/wifi/calling/WifiCallingSettingsForSubTest.java
+++ b/tests/robotests/src/com/android/settings/wifi/calling/WifiCallingSettingsForSubTest.java
@@ -19,18 +19,23 @@
 import static com.google.common.truth.Truth.assertThat;
 
 import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyBoolean;
 import static org.mockito.Matchers.anyInt;
 import static org.mockito.Mockito.doNothing;
 import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
+import android.os.PersistableBundle;
+import android.telephony.CarrierConfigManager;
 import android.telephony.TelephonyManager;
 import android.telephony.ims.ProvisioningManager;
 import android.view.View;
@@ -58,10 +63,15 @@
 
 @RunWith(RobolectricTestRunner.class)
 public class WifiCallingSettingsForSubTest {
+    private static final String BUTTON_WFC_MODE = "wifi_calling_mode";
+    private static final String BUTTON_WFC_ROAMING_MODE = "wifi_calling_roaming_mode";
+
     private TestFragment mFragment;
     private Context mContext;
     private TextView mEmptyView;
+    private final PersistableBundle mBundle = new PersistableBundle();
 
+    @Mock private static CarrierConfigManager sCarrierConfigManager;
     @Mock private ImsManager mImsManager;
     @Mock private TelephonyManager mTelephonyManager;
     @Mock private PreferenceScreen mPreferenceScreen;
@@ -70,6 +80,8 @@
     @Mock private ToggleSwitch mToggleSwitch;
     @Mock private View mView;
     @Mock private ImsConfig mImsConfig;
+    @Mock private ListPreference mButtonWfcMode;
+    @Mock private ListPreference mButtonWfcRoamingMode;
 
     @Before
     public void setUp() throws NoSuchFieldException, ImsException {
@@ -89,6 +101,8 @@
         when(mFragment.getArguments()).thenReturn(bundle);
         doNothing().when(mFragment).addPreferencesFromResource(anyInt());
         doReturn(mock(ListPreference.class)).when(mFragment).findPreference(any());
+        doReturn(mButtonWfcMode).when(mFragment).findPreference(BUTTON_WFC_MODE);
+        doReturn(mButtonWfcRoamingMode).when(mFragment).findPreference(BUTTON_WFC_ROAMING_MODE);
         doNothing().when(mFragment).finish();
         doReturn(mView).when(mFragment).getView();
 
@@ -101,12 +115,26 @@
         doReturn(mImsManager).when(mFragment).getImsManager();
         doReturn(mImsConfig).when(mImsManager).getConfigInterface();
         doReturn(true).when(mImsManager).isWfcProvisionedOnDevice();
+        doReturn(true).when(mImsManager).isWfcEnabledByUser();
+        doReturn(true).when(mImsManager).isNonTtyOrTtyOnVolteEnabled();
+        doReturn(ImsConfig.WfcModeFeatureValueConstants.WIFI_PREFERRED)
+                .when(mImsManager).getWfcMode(anyBoolean());
+
+        doReturn(mBundle).when(sCarrierConfigManager).getConfigForSubId(anyInt());
+        setDefaultCarrierConfigValues();
 
         mFragment.onAttach(mContext);
         mFragment.onCreate(null);
         mFragment.onActivityCreated(null);
     }
 
+    private void setDefaultCarrierConfigValues() {
+        mBundle.putBoolean(
+                CarrierConfigManager.KEY_USE_WFC_HOME_NETWORK_MODE_IN_ROAMING_NETWORK_BOOL, false);
+        mBundle.putBoolean(CarrierConfigManager.KEY_EDITABLE_WFC_MODE_BOOL, true);
+        mBundle.putBoolean(CarrierConfigManager.KEY_EDITABLE_WFC_ROAMING_MODE_BOOL, true);
+    }
+
     @Test
     public void getHelpResource_shouldReturn0() {
         assertThat(mFragment.getHelpResource()).isEqualTo(0);
@@ -142,13 +170,108 @@
         verify(mImsConfig).removeConfigCallback(any());
     }
 
+    @Test
+    public void onResume_useWfcHomeModeConfigFalseAndEditable_shouldShowWfcRoaming() {
+        // Call onResume to update the WFC roaming preference.
+        mFragment.onResume();
+
+        // Check that WFC roaming preference is shown.
+        verify(mPreferenceScreen, times(1)).addPreference(mButtonWfcRoamingMode);
+        verify(mPreferenceScreen, never()).removePreference(mButtonWfcRoamingMode);
+    }
+
+    @Test
+    public void onResume_useWfcHomeModeConfigTrueAndEditable_shouldHideWfcRoaming() {
+        mBundle.putBoolean(
+                CarrierConfigManager.KEY_USE_WFC_HOME_NETWORK_MODE_IN_ROAMING_NETWORK_BOOL, true);
+        mBundle.putBoolean(CarrierConfigManager.KEY_EDITABLE_WFC_ROAMING_MODE_BOOL, true);
+
+        // Call onResume to update the WFC roaming preference.
+        mFragment.onResume();
+
+        // Check that WFC roaming preference is hidden.
+        verify(mPreferenceScreen, never()).addPreference(mButtonWfcRoamingMode);
+        verify(mPreferenceScreen, times(1)).removePreference(mButtonWfcRoamingMode);
+    }
+
+    @Test
+    public void onResume_useWfcHomeModeConfigFalseAndNotEditable_shouldHideWfcRoaming() {
+        mBundle.putBoolean(
+                CarrierConfigManager.KEY_USE_WFC_HOME_NETWORK_MODE_IN_ROAMING_NETWORK_BOOL, false);
+        mBundle.putBoolean(CarrierConfigManager.KEY_EDITABLE_WFC_ROAMING_MODE_BOOL, false);
+
+        // Call onResume to update the WFC roaming preference.
+        mFragment.onResume();
+
+        // Check that WFC roaming preference is hidden.
+        verify(mPreferenceScreen, never()).addPreference(mButtonWfcRoamingMode);
+        verify(mPreferenceScreen, times(1)).removePreference(mButtonWfcRoamingMode);
+    }
+
+    @Test
+    public void onResume_useWfcHomeModeConfigTrueAndNotEditable_shouldHideWfcRoaming() {
+        mBundle.putBoolean(
+                CarrierConfigManager.KEY_USE_WFC_HOME_NETWORK_MODE_IN_ROAMING_NETWORK_BOOL, true);
+        mBundle.putBoolean(CarrierConfigManager.KEY_EDITABLE_WFC_ROAMING_MODE_BOOL, false);
+
+        // Call onResume to update the WFC roaming preference.
+        mFragment.onResume();
+
+        // Check that WFC roaming preference is hidden.
+        verify(mPreferenceScreen, never()).addPreference(mButtonWfcRoamingMode);
+        verify(mPreferenceScreen, times(1)).removePreference(mButtonWfcRoamingMode);
+    }
+
+    @Test
+    public void onPreferenceChange_useWfcHomeModeConfigFalse_shouldNotSetWfcRoaming() {
+        // Call onResume to update carrier config values.
+        mFragment.onResume();
+
+        // Set the WFC home mode.
+        mFragment.onPreferenceChange(mButtonWfcMode,
+                String.valueOf(ImsConfig.WfcModeFeatureValueConstants.CELLULAR_PREFERRED));
+
+        // Check that only WFC home mode is set.
+        verify(mImsManager, times(1)).setWfcMode(
+                eq(ImsConfig.WfcModeFeatureValueConstants.CELLULAR_PREFERRED),
+                eq(false));
+        verify(mImsManager, never()).setWfcMode(
+                eq(ImsConfig.WfcModeFeatureValueConstants.CELLULAR_PREFERRED),
+                eq(true));
+    }
+
+    @Test
+    public void onPreferenceChange_useWfcHomeModeConfigTrue_shouldSetWfcRoaming() {
+        mBundle.putBoolean(
+                CarrierConfigManager.KEY_USE_WFC_HOME_NETWORK_MODE_IN_ROAMING_NETWORK_BOOL, true);
+
+        // Call onResume to update carrier config values.
+        mFragment.onResume();
+
+        // Set the WFC home mode.
+        mFragment.onPreferenceChange(mButtonWfcMode,
+                String.valueOf(ImsConfig.WfcModeFeatureValueConstants.CELLULAR_PREFERRED));
+
+        // Check that both WFC home mode and roaming mode are set.
+        verify(mImsManager, times(1)).setWfcMode(
+                eq(ImsConfig.WfcModeFeatureValueConstants.CELLULAR_PREFERRED),
+                eq(false));
+        verify(mImsManager, times(1)).setWfcMode(
+                eq(ImsConfig.WfcModeFeatureValueConstants.CELLULAR_PREFERRED),
+                eq(true));
+    }
+
     protected class TestFragment extends WifiCallingSettingsForSub {
         @Override
         protected Object getSystemService(final String name) {
-            if (Context.TELEPHONY_SERVICE.equals(name)) {
-                return mTelephonyManager;
+            switch (name) {
+                case Context.TELEPHONY_SERVICE:
+                    return mTelephonyManager;
+                case Context.CARRIER_CONFIG_SERVICE:
+                    return sCarrierConfigManager;
+                default:
+                    return null;
             }
-            return null;
         }
     }
 }