SetupWizard improvement: let users see "scanning"

Current UI shows nothing when there's no connection available, even when
the device is finding some. So user cannot know whether the static
"Not connected" screen means: the device is finding right now, or
actually no network is available.

Change-Id: Ia8ea1c66956e8de819f6a98362bcc9086bda172c

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

@@ -667,4 +667,12 @@ public class WifiSettings extends SettingsPreferenceFragment
         mSelectedAccessPoint = null;
         showConfigUi(null, true);
     }
+
+    /* package */ int getAccessPointsCount() {
+        if (mAccessPoints != null) {
+            return mAccessPoints.getPreferenceCount();
+        } else {
+            return 0;
+        }
+    }
 }