Implement new design of Wi-Fi card

- always show Wi-Fi card
- collapse the card in the new UI session when connecting to a stable
  network
- hide toggle, show a level icon and subtext in the new collapsed mode
- show loading row when the AP list is not full

Test: robotest
Fixes: 147473096
Change-Id: I893064ef04d40d8e7cb8e62c1e72a2cb5e97f6ac

src/com/android/settings/wifi/slice/WifiScanWorker.java

@@ -111,10 +111,11 @@ public class WifiScanWorker extends SliceBackgroundWorker<AccessPoint> implement
         // AccessPoints are sorted by the WifiTracker
         final List<AccessPoint> accessPoints = mWifiTracker.getAccessPoints();
         final List<AccessPoint> resultList = new ArrayList<>();
+        final int apRowCount = getApRowCount();
         for (AccessPoint ap : accessPoints) {
             if (ap.isReachable()) {
                 resultList.add(clone(ap));
-                if (resultList.size() >= DEFAULT_EXPANDED_ROW_COUNT) {
+                if (resultList.size() >= apRowCount) {
                     break;
                 }
             }
@@ -122,6 +123,10 @@ public class WifiScanWorker extends SliceBackgroundWorker<AccessPoint> implement
         updateResults(resultList);
     }
 
+    protected int getApRowCount() {
+        return DEFAULT_EXPANDED_ROW_COUNT;
+    }
+
     private AccessPoint clone(AccessPoint accessPoint) {
         final Bundle savedState = new Bundle();
         accessPoint.saveWifiState(savedState);