Restrict AddAppNetworksActivity for guest user

- Don't show AddAppNetworksActivity if the user is a guest.

Bug: 224772678
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=AddAppNetworksActivityTest

Change-Id: I17571905f1c4a38db884e6d0523b7f8d668df607

src/com/android/settings/wifi/addappnetworks/AddAppNetworksActivity.java

@@ -18,11 +18,14 @@ package com.android.settings.wifi.addappnetworks;
 
 import android.app.ActivityManager;
 import android.app.IActivityManager;
+import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.RemoteException;
+import android.os.UserManager;
 import android.provider.Settings;
 import android.text.TextUtils;
+import android.util.EventLog;
 import android.util.Log;
 import android.view.Gravity;
 import android.view.Window;
@@ -85,7 +88,13 @@ public class AddAppNetworksActivity extends FragmentActivity {
     }
 
     @VisibleForTesting
-    protected boolean showAddNetworksFragment() {
+    boolean showAddNetworksFragment() {
+        if (isGuestUser(getApplicationContext())) {
+            Log.e(TAG, "Guest user is not allowed to configure Wi-Fi!");
+            EventLog.writeEvent(0x534e4554, "224772678", -1 /* UID */, "User is a guest");
+            return false;
+        }
+
         if (!isAddWifiConfigAllow()) {
             Log.d(TAG, "Not allowed by Enterprise Restriction");
             return false;
@@ -130,4 +139,11 @@ public class AddAppNetworksActivity extends FragmentActivity {
     boolean isAddWifiConfigAllow() {
         return WifiEnterpriseRestrictionUtils.isAddWifiConfigAllowed(this);
     }
+
+    private static boolean isGuestUser(Context context) {
+        if (context == null) return false;
+        final UserManager userManager = context.getSystemService(UserManager.class);
+        if (userManager == null) return false;
+        return userManager.isGuestUser();
+    }
 }