Restart Wi-Fi tethering automatically if configuration change

- When the Wi-Fi Hotspot is already started, if the user changes the configuration, the Wi-Fi Hotspot will be restarted automatically.

- When the Wi-Fi hotspot restarts, display a circle on the screen to indicate that it is processing.

Bug: 245258763
Test: manual test
atest -c WifiTetherSettingsTest \
         WifiHotspotSpeedSettingsTest
atest -c WifiHotspotRepositoryTest \
         WifiHotspotSecuritySettingsTest \
         WifiHotspotSecurityViewModelTest \
         WifiHotspotSpeedViewModelTest \
         WifiTetherViewModelTest

Change-Id: I6fdd5892916703095f28d0589ebc3b7dd59fcd61

src/com/android/settings/wifi/tether/WifiTetherViewModel.java

@@ -100,6 +100,15 @@ public class WifiTetherViewModel extends AndroidViewModel {
         return mWifiHotspotRepository.isSpeedFeatureAvailable();
     }
 
+    /**
+     * Gets the Wi-Fi tethered AP Configuration.
+     *
+     * @return AP details in {@link SoftApConfiguration}
+     */
+    public SoftApConfiguration getSoftApConfiguration() {
+        return mWifiHotspotRepository.getSoftApConfiguration();
+    }
+
     /**
      * Sets the tethered Wi-Fi AP Configuration.
      *
@@ -153,4 +162,11 @@ public class WifiTetherViewModel extends AndroidViewModel {
         }
         mSpeedSummary.setValue(resId);
     }
+
+    /**
+     * Gets Restarting LiveData
+     */
+    public LiveData<Boolean> getRestarting() {
+        return mWifiHotspotRepository.getRestarting();
+    }
 }