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

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;