[hearing devices page][Audio routing] Add feature flag to control visibility of the hearing device controls and audio output

* Setup basic xml for hearing device controls and audio output in bluetooth detail device page.
* Use same PreferenceCategory with spatial audio and rename to
  `feature_controls_group`

Bug: 237625815
Test: make RunSettingsRoboTests ROBOTEST_FILTER=BluetoothDetailsHearingDeviceControlsControllerTest
Test: make RunSettingsRoboTests ROBOTEST_FILTER=BluetoothDetailsAudioRoutingControllerTest
Change-Id: Ibe71757b53b9d65c6ab6efa1053d035e78882b68

src/com/android/settings/bluetooth/BluetoothDetailsHearingDeviceControlsController.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2022 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.bluetooth;
+
+import static com.android.settings.bluetooth.BluetoothDeviceDetailsFragment.FEATURE_HEARING_DEVICE_CONTROLS_ORDER;
+
+import android.content.Context;
+import android.util.FeatureFlagUtils;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settingslib.bluetooth.CachedBluetoothDevice;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+
+/**
+ * The controller of the hearing device controls in the bluetooth detail settings.
+ */
+public class BluetoothDetailsHearingDeviceControlsController extends BluetoothDetailsController {
+
+    private static final String KEY_FEATURE_CONTROLS_GROUP = "feature_controls_group";
+    private static final String KEY_HEARING_DEVICE_CONTROLS = "hearing_device_controls";
+
+    public BluetoothDetailsHearingDeviceControlsController(Context context,
+            PreferenceFragmentCompat fragment, CachedBluetoothDevice device, Lifecycle lifecycle) {
+        super(context, fragment, device, lifecycle);
+        lifecycle.addObserver(this);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mCachedDevice.isHearingAidDevice() && FeatureFlagUtils.isEnabled(mContext,
+                FeatureFlagUtils.SETTINGS_ACCESSIBILITY_HEARING_AID_PAGE);
+    }
+
+    @Override
+    protected void init(PreferenceScreen screen) {
+        if (!mCachedDevice.isHearingAidDevice()) {
+            return;
+        }
+
+        final PreferenceCategory prefCategory = screen.findPreference(getPreferenceKey());
+        final Preference pref = createHearingDeviceControlsPreference(prefCategory.getContext());
+        pref.setOrder(FEATURE_HEARING_DEVICE_CONTROLS_ORDER);
+        prefCategory.addPreference(pref);
+    }
+
+    @Override
+    protected void refresh() {}
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_FEATURE_CONTROLS_GROUP;
+    }
+
+    private Preference createHearingDeviceControlsPreference(Context context) {
+        final Preference preference = new Preference(context);
+        preference.setKey(KEY_HEARING_DEVICE_CONTROLS);
+        preference.setTitle(context.getString(R.string.bluetooth_device_controls_title));
+        preference.setSummary(context.getString(R.string.bluetooth_device_controls_summary));
+
+        return preference;
+    }
+}