Added a screen to configure wireless scanning

- Created "Scanning" preference screen

- Added overflow menu on "Location" settings to access "Scanning" settings

- Moved "Wi-Fi scanning always available" from Wi-Fi settings to "Scanning"
  settings

- Added "Bluetooth scanning always available" preference (UI only)

Change-Id: I85d8cd60ab309db5db9caee43f4b5a117192d904

res/values/strings.xml

@@ -1415,12 +1415,6 @@
     <string name="wifi_poor_network_detection_summary">Don\'t use a Wi\u2011Fi network unless it has a good Internet connection</string>
     <!-- Checkbox summary for option to toggle poor network detection [CHAR LIMIT=60] -->
     <string name="wifi_avoid_poor_network_detection_summary">Only use networks that have a good Internet connection</string>
-    <!-- Checkbox title for option to scan always available setting -->
-    <string name="wifi_scan_always_available">Scanning always available</string>
-    <!-- Checkbox title for option to scan always available setting [CHAR LIMIT=60] -->
-    <string name="wifi_scan_always_available_title">Always allow scanning</string>
-    <!-- Checkbox summary for option to toggle scan always available setting -->
-    <string name="wifi_scan_always_available_summary">Let Google\'s location service and other apps scan for networks, even when Wi\u2011Fi is off</string>
     <!-- Checkbox title for option to connect to open Wi-Fi automatically [CHAR LIMIT=40] -->
     <string name="wifi_automatically_connect_title">Use open Wi\u2011Fi automatically</string>
     <!-- Checkbox summary for option to connect to open Wi-Fi automatically  [CHAR LIMIT=100] -->
@@ -2628,6 +2622,21 @@
     <string name="location_mode_battery_saving_description">Use Wi\u2011Fi and cellular networks to determine location</string>
     <!-- [CHAR LIMIT=130] Location mode screen, description for sensors only mode -->
     <string name="location_mode_sensors_only_description">Use GPS to determine location</string>
+    <!-- Help menu label [CHAR LIMIT=20] Location settings screen, overflow menu that takes the user
+      to scanning settings activity -->
+    <string name="location_menu_scanning">Scanning</string>
+    <!-- [CHAR LIMIT=30] Wireless background scanning settings screen, screen title -->
+    <string name="location_scanning_screen_title">Scanning</string>
+    <!-- [CHAR LIMIT=130] Preference title for Wi-Fi always scanning [DO NOT TRANSLATE] -->
+    <string name="location_scanning_wifi_always_scanning_title">Wi\u2011Fi scanning always available</string>
+    <!-- Preference description text for Wi-Fi always scanning [DO NOT TRANSLATE] -->
+    <string name="location_scanning_wifi_always_scanning_description">The clear history button in
+        your browser has saved more lives than Superman</string>
+    <!-- [CHAR LIMIT=130] Description text for Bluetooth always scanning [DO NOT TRANSLATE] -->
+    <string name="location_scanning_bluetooth_always_scanning_title">Bluetooth scanning always available</string>
+    <!-- Description text for Bluetooth always scanning [DO NOT TRANSLATE] -->
+    <string name="location_scanning_bluetooth_always_scanning_description">If you want to catch a
+        squirrel just climb a tree and act like a nut</string>
 
     <!-- [CHAR LIMIT=30] Security & location settings screen, setting check box label for Google location service (cell ID, wifi, etc.) -->
     <string name="location_network_based">Wi\u2011Fi &amp; cellular network location</string>

res/xml/location_scanning.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2015 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"
+        android:title="@string/location_scanning_screen_title">
+
+        <SwitchPreference
+            android:title="@string/location_scanning_wifi_always_scanning_title"
+            android:summary="@string/location_scanning_wifi_always_scanning_description"
+            android:defaultValue="true"
+            android:key="wifi_always_scanning"
+            android:persistent="false" />
+
+        <SwitchPreference
+            android:title="@string/location_scanning_bluetooth_always_scanning_title"
+            android:summary="@string/location_scanning_bluetooth_always_scanning_description"
+            android:defaultValue="true"
+            android:key="bluetooth_always_scanning"
+            android:persistent="false" />
+
+</PreferenceScreen>

res/xml/wifi_advanced_settings.xml

@@ -24,12 +24,6 @@
             android:summary="@string/wifi_notify_open_networks_summary"
             android:persistent="false" />
 
-    <SwitchPreference
-            android:key="wifi_scan_always_available"
-            android:title="@string/wifi_scan_always_available"
-            android:summary="@string/wifi_scan_always_available_summary"
-            android:persistent="false" />
-
     <ListPreference
             android:key="sleep_policy"
             android:title="@string/wifi_setting_sleep_policy_title"

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

@@ -29,6 +29,9 @@ import android.preference.PreferenceCategory;
 import android.preference.PreferenceGroup;
 import android.preference.PreferenceScreen;
 import android.util.Log;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
 import android.widget.Switch;
 
 import com.android.settings.R;
@@ -66,6 +69,8 @@ public class LocationSettings extends LocationSettingsBase
     /** Key for preference category "Location services" */
     private static final String KEY_LOCATION_SERVICES = "location_services";
 
+    private static final int MENU_SCANNING = Menu.FIRST;
+
     private SwitchBar mSwitchBar;
     private Switch mSwitch;
     private boolean mValidListener = false;
@@ -249,6 +254,28 @@ public class LocationSettings extends LocationSettingsBase
         }
     }
 
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        menu.add(0, MENU_SCANNING, 0, R.string.location_menu_scanning);
+        // The super class adds "Help & Feedback" menu item.
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        final SettingsActivity activity = (SettingsActivity) getActivity();
+        switch (item.getItemId()) {
+            case MENU_SCANNING:
+                activity.startPreferencePanel(
+                        ScanningSettings.class.getName(), null,
+                        R.string.location_scanning_screen_title, null, LocationSettings.this,
+                        0);
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+
     @Override
     public int getHelpResource() {
         return R.string.help_url_location_access;

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

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2015 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.preference.Preference;
+import android.preference.PreferenceScreen;
+import android.preference.SwitchPreference;
+import android.provider.Settings.Global;
+
+import com.android.settings.R;
+import com.android.settings.SettingsPreferenceFragment;
+
+/**
+ * A page that configures the background scanning settings for Wi-Fi and Bluetooth.
+ */
+public class ScanningSettings extends SettingsPreferenceFragment {
+    private static final String KEY_WIFI_SCAN_ALWAYS_AVAILABLE = "wifi_always_scanning";
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        createPreferenceHierarchy();
+    }
+
+    private PreferenceScreen createPreferenceHierarchy() {
+        PreferenceScreen root = getPreferenceScreen();
+        if (root != null) {
+            root.removeAll();
+        }
+        addPreferencesFromResource(R.xml.location_scanning);
+        root = getPreferenceScreen();
+        initPreferences();
+        return root;
+    }
+
+    private void initPreferences() {
+        SwitchPreference scanAlwaysAvailable =
+            (SwitchPreference) findPreference(KEY_WIFI_SCAN_ALWAYS_AVAILABLE);
+        scanAlwaysAvailable.setChecked(Global.getInt(getContentResolver(),
+                    Global.WIFI_SCAN_ALWAYS_AVAILABLE, 0) == 1);
+    }
+
+    @Override
+    public boolean onPreferenceTreeClick(PreferenceScreen screen, Preference preference) {
+        String key = preference.getKey();
+        if (KEY_WIFI_SCAN_ALWAYS_AVAILABLE.equals(key)) {
+            Global.putInt(getContentResolver(),
+                    Global.WIFI_SCAN_ALWAYS_AVAILABLE,
+                    ((SwitchPreference) preference).isChecked() ? 1 : 0);
+        } else {
+            return super.onPreferenceTreeClick(screen, preference);
+        }
+        return true;
+    }
+}

src/com/android/settings/wifi/AdvancedWifiSettings.java

@@ -58,7 +58,6 @@ public class AdvancedWifiSettings extends SettingsPreferenceFragment
     private static final String KEY_FREQUENCY_BAND = "frequency_band";
     private static final String KEY_NOTIFY_OPEN_NETWORKS = "notify_open_networks";
     private static final String KEY_SLEEP_POLICY = "sleep_policy";
-    private static final String KEY_SCAN_ALWAYS_AVAILABLE = "wifi_scan_always_available";
     private static final String KEY_INSTALL_CREDENTIALS = "install_credentials";
     private static final String KEY_WIFI_ASSISTANT = "wifi_assistant";
     private static final String KEY_WIFI_DIRECT = "wifi_direct";
@@ -119,11 +118,6 @@ public class AdvancedWifiSettings extends SettingsPreferenceFragment
                 Settings.Global.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON, 0) == 1);
         notifyOpenNetworks.setEnabled(mWifiManager.isWifiEnabled());
 
-        SwitchPreference scanAlwaysAvailable =
-            (SwitchPreference) findPreference(KEY_SCAN_ALWAYS_AVAILABLE);
-        scanAlwaysAvailable.setChecked(Global.getInt(getContentResolver(),
-                    Global.WIFI_SCAN_ALWAYS_AVAILABLE, 0) == 1);
-
         Intent intent = new Intent(Credentials.INSTALL_AS_USER_ACTION);
         intent.setClassName("com.android.certinstaller",
                 "com.android.certinstaller.CertInstallerMain");
@@ -245,10 +239,6 @@ public class AdvancedWifiSettings extends SettingsPreferenceFragment
             Global.putInt(getContentResolver(),
                     Settings.Global.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON,
                     ((SwitchPreference) preference).isChecked() ? 1 : 0);
-        } else if (KEY_SCAN_ALWAYS_AVAILABLE.equals(key)) {
-            Global.putInt(getContentResolver(),
-                    Global.WIFI_SCAN_ALWAYS_AVAILABLE,
-                    ((SwitchPreference) preference).isChecked() ? 1 : 0);
         } else {
             return super.onPreferenceTreeClick(screen, preference);
         }