Server server = new Server("https://horizon-testnet.stellar.org");
        final KeyPair account = KeyPair.fromAccountId("GC2BKLYOOYPDEFJKLKY6FNNRQMGFLVHJKQRGNSSRRGSMPGF32LHCQVGF");

        PaymentsRequestBuilder paymentsRequest = server.payments().forAccount(account);

        paymentsRequest.stream(new EventListener<OperationResponse>() {
            @Override
            public void onEvent(OperationResponse payment) {....

            }

public void StellarTransactionListner(){
...
}