Add developer option for bluetooth Gabeldorche feature

Bug: 146383030
Test: Manually verified toggling on crosshatch
Change-Id: I8871855f0bafd74cec7fb73c4d8bae22764f354a

res/xml/development_settings.xml

@@ -277,6 +277,11 @@
             android:title="@string/bluetooth_disable_absolute_volume"
             android:summary="@string/bluetooth_disable_absolute_volume_summary" />
 
+        <SwitchPreference
+            android:key="bluetooth_gabeldorsche_enable"
+            android:title="@string/bluetooth_enable_gabeldorsche"
+            android:summary="@string/bluetooth_enable_gabeldorsche_summary" />
+
         <SwitchPreference
             android:key="bluetooth_disable_a2dp_hw_offload"
             android:title="@string/bluetooth_disable_a2dp_hw_offload" />

src/com/android/settings/development/BluetoothGabeldorschePreferenceController.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2017 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.development;
+
+import android.content.Context;
+import android.os.SystemProperties;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.SwitchPreference;
+
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+/**
+ * Preference controller for Bluetooth Gabeldorche feature
+ */
+public class BluetoothGabeldorschePreferenceController extends
+        DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener,
+        PreferenceControllerMixin {
+
+    private static final String BLUETOOTH_GABELDORSCHE_KEY =
+            "bluetooth_gabeldorsche_enable";
+    @VisibleForTesting
+    static final String BLUETOOTH_GABELDORSCHE_PROPERTY =
+            "bluetooth.gd.enabled";
+
+    public BluetoothGabeldorschePreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return BLUETOOTH_GABELDORSCHE_KEY;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean isEnabled = (Boolean) newValue;
+        SystemProperties.set(BLUETOOTH_GABELDORSCHE_PROPERTY,
+                isEnabled ? "true" : "false");
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final boolean isEnabled = SystemProperties.getBoolean(
+                BLUETOOTH_GABELDORSCHE_PROPERTY, false /* default */);
+        ((SwitchPreference) mPreference).setChecked(isEnabled);
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        super.onDeveloperOptionsSwitchDisabled();
+        SystemProperties.set(BLUETOOTH_GABELDORSCHE_PROPERTY, "false");
+        ((SwitchPreference) mPreference).setChecked(false);
+    }
+}

src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java

@@ -462,6 +462,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new TetheringHardwareAccelPreferenceController(context));
         controllers.add(new BluetoothDeviceNoNamePreferenceController(context));
         controllers.add(new BluetoothAbsoluteVolumePreferenceController(context));
+        controllers.add(new BluetoothGabeldorschePreferenceController(context));
         controllers.add(new BluetoothAvrcpVersionPreferenceController(context));
         controllers.add(new BluetoothA2dpHwOffloadPreferenceController(context, fragment));
         controllers.add(new BluetoothMaxConnectedAudioDevicesPreferenceController(context));