Do not let guest user disable secure nfc

Bug: 209446496
Test: manual
Change-Id: I7253f7f08fde04e30400a30d9a0d24f1ceff04b0

src/com/android/settings/nfc/SecureNfcEnabler.java

@@ -18,9 +18,8 @@ package com.android.settings.nfc;
 
 import android.content.Context;
 import android.nfc.NfcAdapter;
-import android.provider.Settings;
+import android.os.UserManager;
 
-import androidx.annotation.VisibleForTesting;
 import androidx.preference.SwitchPreference;
 
 import com.android.settings.R;
@@ -32,10 +31,12 @@ import com.android.settings.R;
  */
 public class SecureNfcEnabler extends BaseNfcEnabler {
     private final SwitchPreference mPreference;
+    private final UserManager mUserManager;
 
     public SecureNfcEnabler(Context context, SwitchPreference preference) {
         super(context);
         mPreference = preference;
+        mUserManager = context.getSystemService(UserManager.class);
     }
 
     @Override
@@ -48,7 +49,7 @@ public class SecureNfcEnabler extends BaseNfcEnabler {
             case NfcAdapter.STATE_ON:
                 mPreference.setSummary(R.string.nfc_secure_toggle_summary);
                 mPreference.setChecked(mPreference.isChecked());
-                mPreference.setEnabled(true);
+                mPreference.setEnabled(isToggleable());
                 break;
             case NfcAdapter.STATE_TURNING_ON:
                 mPreference.setEnabled(false);
@@ -58,4 +59,11 @@ public class SecureNfcEnabler extends BaseNfcEnabler {
                 break;
         }
     }
+
+    private boolean isToggleable() {
+        if (mUserManager.isGuestUser()) {
+            return false;
+        }
+        return true;
+    }
 }