Update Location Settings footer when MLS changes

Also changed strings:
- from "Manage location permissions" to "App location permissions"
- from "Location Services" to "manage location services"

Bug: 180533061
Test: on device
Change-Id: I135430674b9363ea7caaa44f6e9baed96b6ec3cf

res/values/strings.xml

@@ -684,10 +684,21 @@
     </plurals>
     <!-- Location settings, loading the number of apps which have location permission [CHAR LIMIT=30] -->
     <string name="location_settings_loading_app_permission_stats">Loading\u2026</string>
-    <!-- Location settings footer warning text [CHAR LIMIT=NONE] -->
-    <string name="location_settings_footer">
+    <!-- Location settings footer warning text when location is on [CHAR LIMIT=NONE] -->
+    <string name="location_settings_footer_location_on">
         Location may use sources like GPS, Wi\u2011Fi, mobile networks, and sensors to help estimate
-        your device\u2019s location.
+        your device\u2019s location. Apps with the nearby devices permission can determine the
+        relative position of connected devices.
+        &lt;a href="<xliff:g example="http://www.google.com" id="url">
+        https://support.google.com/android/answer/3467281</xliff:g>">Learn more&lt;/a>.
+    </string>
+    <!-- Location settings footer warning text when location is off [CHAR LIMIT=NONE] -->
+    <string name="location_settings_footer_location_off">
+        Location access is off for apps and services. Your device location may still be sent to
+        emergency responders when you call or text an emergency number.
+
+        &lt;br>&lt;br>Apps with the nearby devices permission can determine the relative position of
+        connected devices.
     </string>
 
     <!-- Main Settings screen setting option title for the item to take you to the accounts screen [CHAR LIMIT=22] -->
@@ -4090,7 +4101,7 @@
     <string name="managed_profile_location_switch_title">Location for work profile</string>
     <!-- [CHAR LIMIT=30] Location settings screen. It's a link that directs the user to a page that
       shows the location permission setting for each installed app -->
-    <string name="location_app_level_permissions">Manage location permissions</string>
+    <string name="location_app_level_permissions">App location permissions</string>
     <!-- Summary for app permission on Location settings page when location is off [CHAR LIMIT=NONE] -->
     <string name="location_app_permission_summary_location_off">Location is off</string>
     <!--
@@ -4138,6 +4149,8 @@
     <string name="location_scanning_bluetooth_always_scanning_title">Bluetooth scanning</string>
     <!-- Description text for Bluetooth always scanning -->
     <string name="location_scanning_bluetooth_always_scanning_description">Allow apps and services to scan for nearby devices at any time, even when Bluetooth is off. This can be used, for example, to improve location-based features and services.</string>
+    <!-- [CHAR LIMIT=60] Location Services preference title -->
+    <string name="location_services_preference_title">Manage location services</string>
     <!-- [CHAR LIMIT=60] Location Services screen, screen title -->
     <string name="location_services_screen_title">Location Services</string>
     <!-- [CHAR LIMIT=50] Location settings screen, sub category for location services for managed profile -->

res/xml/location_settings.xml

@@ -64,13 +64,14 @@
         <Preference
             android:fragment="com.android.settings.location.LocationServices"
             android:key="location_services"
-            android:title="@string/location_services_screen_title"
+            android:title="@string/location_services_preference_title"
             settings:controller="com.android.settings.location.LocationServicesPreferenceController"/>
 
     </PreferenceCategory>
 
     <com.android.settingslib.widget.FooterPreference
-        android:title="@string/location_settings_footer"
+        android:title="@string/location_settings_footer_location_on"
         android:key="location_footer"
-        android:selectable="false"/>
+        android:selectable="false"
+        settings:controller="com.android.settings.location.LocationSettingsFooterPreferenceController"/>
 </PreferenceScreen>

res/xml/location_settings_personal.xml

@@ -54,7 +54,8 @@
         settings:controller="com.android.settings.location.LocationServicesPreferenceController"/>
 
     <com.android.settingslib.widget.FooterPreference
-        android:title="@string/location_settings_footer"
+        android:title="@string/location_settings_footer_location_on"
         android:key="location_footer"
+        settings:controller="com.android.settings.location.LocationSettingsFooterPreferenceController"
         android:selectable="false"/>
 </PreferenceScreen>

res/xml/location_settings_workprofile.xml

@@ -62,7 +62,8 @@
         settings:controller="com.android.settings.location.LocationServicesForWorkPreferenceController"/>
 
     <com.android.settingslib.widget.FooterPreference
-        android:title="@string/location_settings_footer"
+        android:title="@string/location_settings_footer_location_on"
         android:key="location_footer"
+        settings:controller="com.android.settings.location.LocationSettingsFooterPreferenceController"
         android:selectable="false"/>
 </PreferenceScreen>

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

@@ -50,8 +50,7 @@ public class LocationPersonalSettings extends DashboardFragment {
         super.onAttach(context);
 
         use(AppLocationPermissionPreferenceController.class).init(this);
-        // STOPSHIP(b/180533061): resolve the personal/work location services issue before we can
-        // ship.
+        use(LocationSettingsFooterPreferenceController.class).init(this);
         use(RecentLocationAccessSeeAllButtonPreferenceController.class).init(this);
 
         final int profileType = getArguments().getInt(ProfileSelectFragment.EXTRA_PROFILE);

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

@@ -85,6 +85,7 @@ public class LocationSettings extends DashboardFragment {
         use(RecentLocationAccessPreferenceController.class).init(this);
         use(RecentLocationAccessSeeAllButtonPreferenceController.class).init(this);
         use(LocationForWorkPreferenceController.class).init(this);
+        use(LocationSettingsFooterPreferenceController.class).init(this);
     }
 
     @Override

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

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2021 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.text.Html;
+
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settingslib.widget.FooterPreference;
+
+/**
+ * Preference controller for Location Settings footer.
+ */
+public class LocationSettingsFooterPreferenceController extends LocationBasePreferenceController {
+    FooterPreference mFooterPreference;
+
+    public LocationSettingsFooterPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mFooterPreference = screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public void onLocationModeChanged(int mode, boolean restricted) {
+        boolean enabled = mLocationEnabler.isEnabled(mode);
+        mFooterPreference.setTitle(Html.fromHtml(mContext.getString(
+                enabled ? R.string.location_settings_footer_location_on
+                        : R.string.location_settings_footer_location_off)));
+    }
+}

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

@@ -52,6 +52,7 @@ public class LocationWorkProfileSettings extends DashboardFragment {
         use(AppLocationPermissionPreferenceController.class).init(this);
         use(LocationForWorkPreferenceController.class).init(this);
         use(RecentLocationAccessSeeAllButtonPreferenceController.class).init(this);
+        use(LocationSettingsFooterPreferenceController.class).init(this);
 
         final int profileType = getArguments().getInt(ProfileSelectFragment.EXTRA_PROFILE);
         final RecentLocationAccessPreferenceController controller = use(