[hearing devices page] Add feature flag to control visibility of the hearing devices page

* Setup basic xml for hearing devices page

Bug: 237625815
Test: make RunSettingsRoboTests ROBOTEST_FILTER=AccessibilityHearingAidsFragmentTest
Change-Id: I3cc794e124d1dfda46f8d5fba658de47f84b63f5

res/xml/accessibility_hearing_aids.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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.
+-->
+
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:settings="http://schemas.android.com/apk/res-auto"
+    android:key="accessibility_hearing_devices_screen"
+    android:title="@string/accessibility_hearingaid_title">
+
+    <com.android.settingslib.RestrictedPreference
+        android:key="add_bt_devices"
+        android:title="@string/bluetooth_pairing_pref_title"
+        android:icon="@drawable/ic_add_24dp"
+        android:summary="@string/connected_device_add_device_summary"
+        settings:userRestriction="no_config_bluetooth"
+        settings:useAdminDisabledSummary="true" />
+
+    <PreferenceCategory
+        android:key="device_control_category"
+        android:title="@string/accessibility_hearing_device_control">
+
+        <SwitchPreference
+            android:key="hearing_aid_compatibility"
+            android:title="@string/accessibility_hac_mode_title"
+            android:summary="@string/accessibility_hac_mode_summary"
+            settings:searchable="true" />
+
+    </PreferenceCategory>
+
+    <com.android.settings.accessibility.AccessibilityFooterPreference
+        android:key="hearing_device_footer"
+        android:title="@string/accessibility_hearing_device_footer_summary"
+        android:selectable="false"
+        settings:searchable="false" />
+</PreferenceScreen>

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

@@ -16,7 +16,6 @@
 
 package com.android.settings.accessibility;
 
-import android.app.settings.SettingsEnums;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 import android.bluetooth.BluetoothHapClient;
@@ -29,6 +28,7 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Bundle;
 import android.text.TextUtils;
+import android.util.FeatureFlagUtils;
 import android.util.Log;
 
 import androidx.annotation.VisibleForTesting;
@@ -129,6 +129,11 @@ public class AccessibilityHearingAidPreferenceController extends BasePreferenceC
     public boolean handlePreferenceTreeClick(Preference preference) {
         if (TextUtils.equals(preference.getKey(), getPreferenceKey())) {
             final CachedBluetoothDevice device = getConnectedHearingAidDevice();
+            if (FeatureFlagUtils.isEnabled(mContext,
+                    FeatureFlagUtils.SETTINGS_ACCESSIBILITY_HEARING_AID_PAGE)) {
+                launchHearingAidPage();
+                return true;
+            }
             if (device == null) {
                 launchHearingAidInstructionDialog();
             } else {
@@ -295,7 +300,7 @@ public class AccessibilityHearingAidPreferenceController extends BasePreferenceC
                 .setDestination(BluetoothDeviceDetailsFragment.class.getName())
                 .setArguments(args)
                 .setTitleRes(R.string.device_details_title)
-                .setSourceMetricsCategory(SettingsEnums.ACCESSIBILITY)
+                .setSourceMetricsCategory(getMetricsCategory())
                 .launch();
     }
 
@@ -304,4 +309,11 @@ public class AccessibilityHearingAidPreferenceController extends BasePreferenceC
         HearingAidDialogFragment fragment = HearingAidDialogFragment.newInstance();
         fragment.show(mFragmentManager, HearingAidDialogFragment.class.toString());
     }
+
+    private void launchHearingAidPage() {
+        new SubSettingLauncher(mContext)
+                .setDestination(AccessibilityHearingAidsFragment.class.getName())
+                .setSourceMetricsCategory(getMetricsCategory())
+                .launch();
+    }
 }

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

@@ -0,0 +1,68 @@
+/*
+ * 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.accessibility;
+
+import static android.os.UserManager.DISALLOW_CONFIG_BLUETOOTH;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import com.android.settings.R;
+import com.android.settings.dashboard.RestrictedDashboardFragment;
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settingslib.search.SearchIndexable;
+
+/** Accessibility settings for hearing aids. */
+@SearchIndexable(forTarget = SearchIndexable.ALL & ~SearchIndexable.ARC)
+public class AccessibilityHearingAidsFragment extends RestrictedDashboardFragment {
+
+    private static final String TAG = "AccessibilityHearingAidsFragment";
+
+    public AccessibilityHearingAidsFragment() {
+        super(DISALLOW_CONFIG_BLUETOOTH);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        // TODO(b/237625815): Add shortcutPreference by extending
+        //  AccessibilityShortcutPreferenceFragment
+
+        return super.onCreateView(inflater, container, savedInstanceState);
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        // TODO(b/262839191): To be updated settings_enums.proto
+        return 0;
+    }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.accessibility_hearing_aids;
+    }
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
+    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+            new BaseSearchIndexProvider(R.xml.accessibility_hearing_aids);
+}

tests/robotests/src/com/android/settings/accessibility/AccessibilityHearingAidsFragmentTest.java

@@ -0,0 +1,54 @@
+/*
+ * 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.accessibility;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.R;
+import com.android.settings.testutils.XmlTestUtils;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+import org.robolectric.RobolectricTestRunner;
+
+import java.util.List;
+
+/** Tests for {@link AccessibilityHearingAidsFragment}. */
+@RunWith(RobolectricTestRunner.class)
+public class AccessibilityHearingAidsFragmentTest {
+
+    @Rule
+    public MockitoRule mMockitoRule = MockitoJUnit.rule();
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+
+    @Test
+    public void getNonIndexableKeys_existInXmlLayout() {
+        final List<String> niks = AccessibilityHearingAidsFragment.SEARCH_INDEX_DATA_PROVIDER
+                .getNonIndexableKeys(mContext);
+        final List<String> keys =
+                XmlTestUtils.getKeysFromPreferenceXml(mContext, R.xml.accessibility_hearing_aids);
+
+        assertThat(keys).containsAtLeastElementsIn(niks);
+    }
+}