Add WiFi Enterprise restrictions check for WiFi Configuration Addition

When UserManager.DISALLOW_ADD_WIFI_CONFIG is set to true.
  - Disable the "Add network" item in the Internet settings.

  - Activity action API for ACTION_WIFI_ADD_NETWORKS should not be
    permitted and the user shouldn’t see a prompt for approval

Bug: 203169077
Test: make RunSettingsRoboTests ROBOTEST_FILTER=NetworkProviderSettingsTest
Test: make RunSettingsRoboTests ROBOTEST_FILTER=AddAppNetworksActivityTest
Change-Id: I18d7703b5972bfbc12dca10b6432d756813abace

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

@@ -26,8 +26,10 @@ import androidx.annotation.DrawableRes;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceViewHolder;
 
+import com.android.internal.annotations.VisibleForTesting;
 import com.android.settings.R;
 import com.android.settings.wifi.dpp.WifiDppUtils;
+import com.android.settingslib.wifi.WifiEnterpriseRestrictionUtils;
 
 /**
  * The Preference for users to add Wi-Fi networks in WifiSettings
@@ -37,6 +39,8 @@ public class AddWifiNetworkPreference extends Preference {
     private static final String TAG = "AddWifiNetworkPreference";
 
     private final Drawable mScanIconDrawable;
+    @VisibleForTesting
+    boolean mIsAddWifiConfigAllow;
 
     public AddWifiNetworkPreference(Context context) {
         super(context);
@@ -47,6 +51,8 @@ public class AddWifiNetworkPreference extends Preference {
         setTitle(R.string.wifi_add_network);
 
         mScanIconDrawable = getDrawable(R.drawable.ic_scan_24dp);
+        mIsAddWifiConfigAllow = WifiEnterpriseRestrictionUtils.isAddWifiConfigAllowed(context);
+        updatePreferenceForRestriction();
     }
 
     @Override
@@ -73,4 +79,12 @@ public class AddWifiNetworkPreference extends Preference {
         }
         return buttonIcon;
     }
+
+    @VisibleForTesting
+    void updatePreferenceForRestriction() {
+        if (!mIsAddWifiConfigAllow) {
+            setEnabled(false);
+            setSummary(R.string.not_allowed_by_ent);
+        }
+    }
 }