Show policy transparency dialog if adding Wi-Fi config is not allowed

- When the user is restricted by UserManager.DISALLOW_ADD_WIFI_CONFIG, clicking on a Wi-Fi network will show the Settings policy transparency dialog.

- The "Not allowed by your organization" summary in Wi-Fi networks will be removed in a separate CL.

Bug: 233871529
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=Wifi

Change-Id: Ia978be8e85a5809de1331f3e0edc11fbc8925c80

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

@@ -19,28 +19,25 @@ package com.android.settings.wifi;
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.drawable.Drawable;
+import android.os.UserManager;
 import android.util.Log;
 import android.widget.ImageButton;
 
 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;
+import com.android.settingslib.RestrictedPreference;
 
 /**
  * The Preference for users to add Wi-Fi networks in WifiSettings
  */
-public class AddWifiNetworkPreference extends Preference {
+public class AddWifiNetworkPreference extends RestrictedPreference {
 
     private static final String TAG = "AddWifiNetworkPreference";
 
     private final Drawable mScanIconDrawable;
-    @VisibleForTesting
-    boolean mIsAddWifiConfigAllow;
 
     public AddWifiNetworkPreference(Context context) {
         super(context);
@@ -51,8 +48,7 @@ public class AddWifiNetworkPreference extends Preference {
         setTitle(R.string.wifi_add_network);
 
         mScanIconDrawable = getDrawable(R.drawable.ic_scan_24dp);
-        mIsAddWifiConfigAllow = WifiEnterpriseRestrictionUtils.isAddWifiConfigAllowed(context);
-        updatePreferenceForRestriction();
+        checkRestrictionAndSetDisabled(UserManager.DISALLOW_ADD_WIFI_CONFIG);
     }
 
     @Override
@@ -79,12 +75,4 @@ public class AddWifiNetworkPreference extends Preference {
         }
         return buttonIcon;
     }
-
-    @VisibleForTesting
-    void updatePreferenceForRestriction() {
-        if (!mIsAddWifiConfigAllow) {
-            setEnabled(false);
-            setSummary(R.string.not_allowed_by_ent);
-        }
-    }
 }