Add pair button in bluetooth details page for hearing aid device

Root Cause: Users can not connect another ear again after they cancel
the pairing dialog in Accessibility -> hearing aids entry

Solution: Add pair button in bluetooth details page for hearing aid
device

Bug: 233038449
Test: make RunSettingsRoboTests
ROBOTEST_FILTER=BluetoothDetailsPairOtherControllerTest

Change-Id: I6a7af1c2c2263476b040233edb072cc64a2927b0

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

@@ -0,0 +1,102 @@
+/*
+ * 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 android.content.Context;
+
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.SubSettingLauncher;
+import com.android.settingslib.bluetooth.CachedBluetoothDevice;
+import com.android.settingslib.bluetooth.HearingAidProfile;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+import com.android.settingslib.widget.ButtonPreference;
+
+/**
+ * This class handles button preference logic to display for hearing aid device.
+ */
+public class BluetoothDetailsPairOtherController extends BluetoothDetailsController {
+    private static final String KEY_PAIR_OTHER = "hearing_aid_pair_other_button";
+
+    private ButtonPreference mPreference;
+
+    public BluetoothDetailsPairOtherController(Context context,
+            PreferenceFragmentCompat fragment,
+            CachedBluetoothDevice device,
+            Lifecycle lifecycle) {
+        super(context, fragment, device, lifecycle);
+        lifecycle.addObserver(this);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return getButtonPreferenceVisibility(mCachedDevice);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_PAIR_OTHER;
+    }
+
+    @Override
+    protected void init(PreferenceScreen screen) {
+        final int side = mCachedDevice.getDeviceSide();
+        final int stringRes = (side == HearingAidProfile.DeviceSide.SIDE_LEFT)
+                ? R.string.bluetooth_pair_right_ear_button
+                : R.string.bluetooth_pair_left_ear_button;
+
+        mPreference = screen.findPreference(getPreferenceKey());
+        mPreference.setTitle(stringRes);
+        mPreference.setOnClickListener(v -> launchPairingDetail());
+    }
+
+    @Override
+    protected void refresh() {
+        mPreference.setVisible(getButtonPreferenceVisibility(mCachedDevice));
+    }
+
+    private boolean getButtonPreferenceVisibility(CachedBluetoothDevice cachedDevice) {
+        return isBinauralMode(cachedDevice) && isOnlyOneSideConnected(cachedDevice);
+    }
+
+    private void launchPairingDetail() {
+        new SubSettingLauncher(mContext)
+                .setDestination(BluetoothPairingDetail.class.getName())
+                .setSourceMetricsCategory(
+                        ((BluetoothDeviceDetailsFragment) mFragment).getMetricsCategory())
+                .launch();
+    }
+
+    private boolean isBinauralMode(CachedBluetoothDevice cachedDevice) {
+        return cachedDevice.getDeviceMode() == HearingAidProfile.DeviceMode.MODE_BINAURAL;
+    }
+
+    private boolean isOnlyOneSideConnected(CachedBluetoothDevice cachedDevice) {
+        if (!cachedDevice.isConnectedHearingAidDevice()) {
+            return false;
+        }
+
+        final CachedBluetoothDevice subDevice = cachedDevice.getSubDevice();
+        if (subDevice != null && subDevice.isConnectedHearingAidDevice()) {
+            return false;
+        }
+
+        return true;
+    }
+}