[Pair hearing devices] Add "Hearing devices" to show connected hearing devices

Bug: 237625815
Test: make RunSettingsRoboTests ROBOTEST_FILTER=AvailableHearingDeviceUpdaterTest
Change-Id: I15bff230cac29fdbad13d452878bc57b57d9773e

src/com/android/settings/accessibility/AvailableHearingDeviceUpdater.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2023 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.accessibility;
+
+import android.bluetooth.BluetoothDevice;
+import android.content.Context;
+
+import com.android.settings.bluetooth.AvailableMediaBluetoothDeviceUpdater;
+import com.android.settings.connecteddevice.DevicePreferenceCallback;
+import com.android.settingslib.bluetooth.CachedBluetoothDevice;
+
+/**
+ * Maintains and updates connected hearing devices, including ASHA and HAP profile.
+ */
+public class AvailableHearingDeviceUpdater extends AvailableMediaBluetoothDeviceUpdater {
+
+    private static final String PREF_KEY = "connected_hearing_device";
+
+    public AvailableHearingDeviceUpdater(Context context,
+            DevicePreferenceCallback devicePreferenceCallback, int metricsCategory) {
+        super(context, devicePreferenceCallback, metricsCategory);
+    }
+
+    @Override
+    public boolean isFilterMatched(CachedBluetoothDevice cachedDevice) {
+        final BluetoothDevice device = cachedDevice.getDevice();
+        final boolean isConnectedHearingAidDevice = (cachedDevice.isConnectedHearingAidDevice()
+                && (device.getBondState() == BluetoothDevice.BOND_BONDED));
+
+        return isConnectedHearingAidDevice && isDeviceInCachedDevicesList(cachedDevice);
+    }
+
+    @Override
+    protected String getPreferenceKey() {
+        return PREF_KEY;
+    }
+}