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

2 files changed, 96 insertions, 0 deletions

diff --git a/src/com/android/settings/location/LocationSettings.java b/src/com/android/settings/location/LocationSettings.java
index 1ed2ece..d66f91c 100644
--- a/src/com/android/settings/location/LocationSettings.java
+++ b/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;
@@ -250,6 +255,28 @@ 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;
     }
diff --git a/src/com/android/settings/location/ScanningSettings.java b/src/com/android/settings/location/ScanningSettings.java
new file mode 100644
index 0000000..364ad7b
--- /dev/null
+++ b/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;
+    }
+}