Update SoundSettings to extend DashboardFragment.

- initial round of refactoring SoundSettings to use DashboardFragment.
- add controller for Cast, Do not disturb, Alarm volume, Media volume,
  Ring volume and Notification volume.

Bug: 32276590
Test: make RunSettingsRoboTests
Change-Id: I5c02a344bff5117bfce93d7ccac650fccc82d2b0

src/com/android/settings/notification/AlarmVolumePreferenceController.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2016 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.AudioManager;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.core.lifecycle.Lifecycle;
+import com.android.settings.notification.VolumeSeekBarPreference.Callback;
+
+public class AlarmVolumePreferenceController extends
+    VolumeSeekBarPreferenceController {
+
+    private static final String KEY_ALARM_VOLUME = "alarm_volume";
+    private AudioHelper mHelper;
+
+    public AlarmVolumePreferenceController(Context context, Callback callback,
+        Lifecycle lifecycle) {
+        this(context, callback, lifecycle, new AudioHelper(context));
+    }
+
+    @VisibleForTesting
+    AlarmVolumePreferenceController(Context context, Callback callback, Lifecycle lifecycle,
+        AudioHelper helper) {
+        super(context, callback, lifecycle);
+        mHelper = helper;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return !mHelper.isSingleVolume();
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_ALARM_VOLUME;
+    }
+
+    @Override
+    public int getAudioStream() {
+        return AudioManager.STREAM_ALARM;
+    }
+
+    @Override
+    public int getMuteIcon() {
+        return com.android.internal.R.drawable.ic_audio_alarm_mute;
+    }
+
+}