Verify setForegroundDispatch caller is in foreground.

Bug: 28300969
Change-Id: Icadfe70cd06f921badd266e7a4efbae15a8c206a

src/com/android/nfc/NfcService.java

@@ -805,7 +805,10 @@ public class NfcService implements DeviceHostListener {
         public void setForegroundDispatch(PendingIntent intent,
                 IntentFilter[] filters, TechListParcel techListsParcel) {
             NfcPermissions.enforceUserPermissions(mContext);
-
+            if (!mForegroundUtils.isInForeground(Binder.getCallingUid())) {
+                Log.e(TAG, "setForegroundDispatch: Caller not in foreground.");
+                return;
+            }
             // Short-cut the disable path
             if (intent == null && filters == null && techListsParcel == null) {
                 mNfcDispatcher.setForegroundDispatch(null, null, null);
@@ -935,6 +938,10 @@ public class NfcService implements DeviceHostListener {
         @Override
         public void setReaderMode(IBinder binder, IAppCallback callback, int flags, Bundle extras)
                 throws RemoteException {
+            if (!mForegroundUtils.isInForeground(Binder.getCallingUid())) {
+                Log.e(TAG, "setReaderMode: Caller not in foreground.");
+                return;
+            }
             synchronized (NfcService.this) {
                 if (!isNfcEnabled()) {
                     Log.e(TAG, "setReaderMode() called while NFC is not enabled.");