Improve discoverability of the intent & actions progress

- Display "Select the network you want to use for data" on sub-title
when Wi-Fi networks is not empty

- Screenshot:
  https://screenshot.googleplex.com/6nuwYoSh7UjF93Q

Bug: 186432232
Test: manual test
atest -c InternetConnectivityPanelTest

Change-Id: I9ab0ce0ca052b3444e50a914b59f38e4e7778ddf

src/com/android/settings/panel/InternetConnectivityPanel.java

@@ -65,6 +65,8 @@ public class InternetConnectivityPanel implements PanelContent, LifecycleObserve
     private static final String TAG = "InternetConnectivityPanel";
     private static final int SUBTITLE_TEXT_NONE = -1;
     private static final int SUBTITLE_TEXT_WIFI_IS_TURNED_ON = R.string.wifi_is_turned_on_subtitle;
+    private static final int SUBTITLE_TEXT_SELECT_NETWORK_TO_CONNECT_INTERNET =
+            R.string.select_network_to_connect_internet;
     private static final int SUBTITLE_TEXT_SEARCHING_FOR_NETWORKS =
             R.string.wifi_empty_list_wifi_on;
     private static final int SUBTITLE_TEXT_NON_CARRIER_NETWORK_UNAVAILABLE =
@@ -322,6 +324,9 @@ public class InternetConnectivityPanel implements PanelContent, LifecycleObserve
 
         final List<ScanResult> wifiList = mWifiManager.getScanResults();
         if (wifiList != null && wifiList.size() != 0) {
+            // When the Wi-Fi scan result is not empty
+            //   Sub-Title: Select the network you want to use for data
+            mSubtitle = SUBTITLE_TEXT_SELECT_NETWORK_TO_CONNECT_INTERNET;
             return;
         }