Show policy transparency dialog for Wi-Fi network restrictions

- In order to support various user restrictions of individual Wi-Fi networks, WifiEntry provides the hasAdminRestrictions method for unified management.

- Settings will refer to WifiEntry#hasAdminRestrictions to restrict individual Wi-Fi networks.

Bug: 289448751
Bug: 289951241
Test: manual test
atest -c LongPressWifiEntryPreferenceTest

Change-Id: Iae5996a87ee72a3073300c7f62dfa14a9f31c21d

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

@@ -22,6 +22,7 @@ import androidx.annotation.VisibleForTesting;
 import androidx.fragment.app.Fragment;
 import androidx.preference.PreferenceViewHolder;
 
+import com.android.settingslib.RestrictedLockUtils;
 import com.android.wifitrackerlib.WifiEntry;
 
 /**
@@ -34,7 +35,7 @@ public class LongPressWifiEntryPreference extends WifiEntryPreference {
     public LongPressWifiEntryPreference(Context context, WifiEntry wifiEntry, Fragment fragment) {
         super(context, wifiEntry);
         mFragment = fragment;
-        checkRestrictionAndSetDisabled(UserManager.DISALLOW_ADD_WIFI_CONFIG);
+        checkRestrictionAndSetDisabled();
     }
 
     @Override
@@ -65,4 +66,22 @@ public class LongPressWifiEntryPreference extends WifiEntryPreference {
         }
         return enabled;
     }
+
+    @VisibleForTesting
+    void checkRestrictionAndSetDisabled() {
+        if (!getWifiEntry().hasAdminRestrictions()) {
+            return;
+        }
+        RestrictedLockUtils.EnforcedAdmin admin = null;
+        Context context = getContext();
+        if (context != null) {
+            admin = RestrictedLockUtils.getProfileOrDeviceOwner(context, context.getUser());
+        }
+        if (admin == null) {
+            // Use UserManager.DISALLOW_ADD_WIFI_CONFIG as default Wi-Fi network restriction.
+            admin = RestrictedLockUtils.EnforcedAdmin.createDefaultEnforcedAdminWithRestriction(
+                    UserManager.DISALLOW_ADD_WIFI_CONFIG);
+        }
+        setDisabledByAdmin(admin);
+    }
 }