Add Volume panel

Volume panel hosts each volume stream, including:
- Media volume
- Call Volume
- Ring volume
- Alarm volume

Change-Id: I1801d10d2304c57615e9499386c638c74ffcd7c3
Screenshot: https://screenshot.googleplex.com/m764j65ECto
Bug: 117804161
Test: Manual app
Test: robolectric

src/com/android/settings/panel/VolumePanel.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2018 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.panel;
+
+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_RINGER_URI;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.provider.Settings;
+
+import com.android.settings.R;
+import java.util.ArrayList;
+import java.util.List;
+
+public class VolumePanel implements PanelContent {
+
+    private final Context mContext;
+
+    public static VolumePanel create(Context context) {
+        return new VolumePanel(context);
+    }
+
+    private VolumePanel(Context context) {
+        mContext = context.getApplicationContext();
+    }
+
+    @Override
+    public CharSequence getTitle() {
+        return mContext.getText(R.string.volume_connectivity_panel_title);
+    }
+
+    @Override
+    public List<Uri> getSlices() {
+        final List<Uri> uris = new ArrayList<>();
+        uris.add(VOLUME_MEDIA_URI);
+        uris.add(VOLUME_CALL_URI);
+        uris.add(VOLUME_RINGER_URI);
+        uris.add(VOLUME_ALARM_URI);
+        return uris;
+    }
+
+    @Override
+    public Intent getSeeMoreIntent() {
+        return new Intent(Settings.ACTION_SOUND_SETTINGS);
+    }
+}