Add a developer option to enable / disable location indicators.

Also bundled location related developer options into the location
category.

Bug:175357420

Test: Manual && make RunSettingsRoboTests ROBOTEST_FILTER=LocationScanningPreferenceControllerTest

Change-Id: Ic33ad6e70d258c9afc2cefba70ab6e7b2bafd16a

src/com/android/settings/location/LocationIndicatorsPreferenceController.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2020 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.location;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.provider.DeviceConfig;
+
+import com.android.settings.Utils;
+import com.android.settings.core.TogglePreferenceController;
+
+/** Controller for location indicators toggle. */
+public class LocationIndicatorsPreferenceController extends TogglePreferenceController {
+
+    public LocationIndicatorsPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public boolean isChecked() {
+        return DeviceConfig.getBoolean(DeviceConfig.NAMESPACE_PRIVACY,
+                Utils.PROPERTY_LOCATION_INDICATORS_ENABLED, false);
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        DeviceConfig.setProperty(DeviceConfig.NAMESPACE_PRIVACY,
+                Utils.PROPERTY_LOCATION_INDICATORS_ENABLED, Boolean.toString(isChecked), true);
+        return true;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        // Location indicators feature is only available on devices that support location.
+        return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_LOCATION)
+                ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
+    }
+}