gistfile1.java

public class MainActivity extends AppCompatActivity {

    private Button btnPayment;
    private MidtransSDK midtransSDK;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        bindView();
        initializeMidtransUiKitSdk();
        midtransSDK = MidtransSDK.getInstance();

        btnPayment.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                payTransaction();
            }
        });
    }

    private void bindView() {
        btnPayment = findViewById(R.id.btn_payment_ui);
        btnWithToken = findViewById(R.id.btn_with_token);
    }

    private void initializeMidtransUiKitSdk(){
        SdkUIFlowBuilder.init()
                .setClientKey(CLIENT_KEY) // client_key is mandatory
                .setContext(this) // context is mandatory
                .setTransactionFinishedCallback(new TransactionFinishedCallback() {
                    @Override
                    public void onTransactionFinished(TransactionResult result) {
                        // Handle finished transaction here.
                    }
                }) // set transaction finish callback (sdk callback)
                .setMerchantBaseUrl(BASE_URL) //set merchant url (required)
                .enableLog(true) // enable sdk log (optional)
                .setColorTheme(new CustomColorTheme("#FFE51255", "#B61548", "#FFE51255")) // set theme. it will replace theme on snap theme on MAP ( optional)
                .buildSDK();
    }

    private void payTransaction() {

        CreditCard creditCard = new CreditCard();
        creditCard.setAuthentication(Authentication.AUTH_3DS);
        creditCard.setSaveCard(true);


        final UUID idRand = UUID.randomUUID();
        TransactionRequest transactionRequest = new TransactionRequest(idRand.toString(),202020);
        transactionRequest.setCreditCard(creditCard);

        midtransSDK.setTransactionRequest(transactionRequest);
        midtransSDK.startPaymentUiFlow(this);


    }
}