How to integrate TEST PayU Payment Gateway in android application?

Question

I am new in Payment Gateway. Currently, I am working on a mobile app where I need to integrate PayU payment gateway in android app.

So far, I have created a code for TES

Answer 1

I have successfully implemented payment Gateway.

Images used in drawable for progress dialog

PayUMoneyActivity

public class PayUMoneyActivity extends AppCompatActivity {

WebView webView;
Context activity;
/**
 * Order Id
 * To Request for Updating Payment Status if Payment Successfully Done
 */
int mId;
private String mMerchantKey = "JBZaLc";//For merchant and salt key you need to contact payu money tech support otherwise you get error
private String mSalt = "GQs7yium";//copy and paste works fine 
private String mBaseURL = "https://test.payu.in";
private String mAction = ""; // For Final URL
private String mTXNId; // This will create below randomly
private String mHash; // This will create below randomly
private String mProductInfo; // From Previous Activity
private String mFirstName; // From Previous Activity
private String mEmailId; // From Previous Activity
private double mAmount; // From Previous Activity
private String mPhone; // From Previous Activity
private String mServiceProvider = "payu_paisa";
private String mSuccessUrl = "https://payu.herokuapp.com/success";
private String mFailedUrl = "https://payu.herokuapp.com/failure";


boolean isFromOrder;
/**
 * Handler os handler
 */
Handler mHandler = new Handler();
private String TAG = "User info";
private ProgressDialog progressDialog;


/**
 * @param savedInstanceState
 */
@SuppressLint({"AddJavascriptInterface", "SetJavaScriptEnabled", "JavascriptInterface"})
@Override
protected void onCreate(Bundle savedInstanceState) {
    // getWindow().requestFeature(Window.FEATURE_PROGRESS);
    super.onCreate(savedInstanceState);
   /**
     * Setting WebView to Screen
     */
    setContentView(R.layout.activity_payumoney);
    /**
     * start processing Payu dialog
     */
    progressBarVisibilityPayuChrome(View.VISIBLE);

    /**
     * Creating WebView
     */
    webView = (WebView) findViewById(R.id.payumoney_webview);

    /**
     * Context Variable
     */
    activity = getApplicationContext();
    /**
     * Getting Intent Variables...
     */
    Bundle bundle = getIntent().getExtras();
    if (bundle != null) {
        mFirstName = bundle.getString("name");
        mEmailId = bundle.getString("email");
        mProductInfo = bundle.getString("productInfo");
        mAmount = Double.parseDouble(bundle.getString("amount"));//in my case amount getting as String so i parse it double
        mPhone = bundle.getString("phone");
        mId = bundle.getInt("id");
        isFromOrder = bundle.getBoolean("isFromOrder");

        Log.i(TAG, "" + mFirstName + " : " + mEmailId + " : " + mAmount + " : " + mPhone);

        /**
         * Creating Transaction Id
         */
        Random rand = new Random();
        String randomString = Integer.toString(rand.nextInt()) + (System.currentTimeMillis() / 1000L);
        mTXNId = hashCal("SHA-256", randomString).substring(0, 20);

        mAmount = new BigDecimal(mAmount).setScale(0, RoundingMode.UP).intValue();

        /**
         * Creating Hash Key
         */
        mHash = hashCal("SHA-512", mMerchantKey + "|" +
                mTXNId + "|" +
                mAmount + "|" +
                mProductInfo + "|" +
                mFirstName + "|" +
                mEmailId + "|||||||||||" +
                mSalt);

        /**
         * Final Action URL...
         */
        mAction = mBaseURL.concat("/_payment");

        /**
         * WebView Client
         */
        webView.setWebViewClient(new WebViewClient() {

            @Override
            public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
                super.onReceivedError(view, request, error);
                Toast.makeText(activity, "Oh no! " + error, Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onReceivedSslError(WebView view,
                                           SslErrorHandler handler, SslError error) {
                Toast.makeText(activity, "SSL Error! " + error, Toast.LENGTH_SHORT).show();
                handler.proceed();
            }

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                return super.shouldOverrideUrlLoading(view, url);
            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
            }

            @Override
            public void onPageFinished(WebView view, String url) {

                if (url.equals(mSuccessUrl)) {

                    Intent intent = new Intent(PayUMoneyActivity.this, PaymentStatusActivity.class);
                    intent.putExtra("status", true);
                    intent.putExtra("transaction_id", mTXNId);
                    intent.putExtra("id", mId);
                    intent.putExtra("isFromOrder", isFromOrder);
                    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(intent);
                } else if (url.equals(mFailedUrl)) {
                    Intent intent = new Intent(PayUMoneyActivity.this, PaymentStatusActivity.class);
                    intent.putExtra("status", false);
                    intent.putExtra("transaction_id", mTXNId);
                    intent.putExtra("id", mId);
                    intent.putExtra("isFromOrder", isFromOrder);
                    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(intent);
                }
                /**
                 * wait 10 seconds to dismiss payu money processing dialog in my case
                 */
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        progressBarVisibilityPayuChrome(View.GONE);
                    }
                }, 10000);

                super.onPageFinished(view, url);
            }
        });

        webView.setVisibility(View.VISIBLE);
        webView.getSettings().setBuiltInZoomControls(true);
        webView.getSettings().setCacheMode(2);
        webView.getSettings().setDomStorageEnabled(true);
        webView.clearHistory();
        webView.clearCache(true);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setSupportZoom(true);
        webView.getSettings().setUseWideViewPort(false);
        webView.getSettings().setLoadWithOverviewMode(false);
        webView.addJavascriptInterface(new PayUJavaScriptInterface(PayUMoneyActivity.this), "PayUMoney");

        /**
         * Mapping Compulsory Key Value Pairs
         */
        Map mapParams = new HashMap<>();
        mapParams.put("key", mMerchantKey);
        mapParams.put("txnid", mTXNId);
        mapParams.put("amount", String.valueOf(mAmount));
        mapParams.put("productinfo", mProductInfo);
        mapParams.put("firstname", mFirstName);
        mapParams.put("email", mEmailId);
        mapParams.put("phone", mPhone);
        mapParams.put("surl", mSuccessUrl);
        mapParams.put("furl", mFailedUrl);
        mapParams.put("hash", mHash);
        mapParams.put("service_provider", mServiceProvider);

        webViewClientPost(webView, mAction, mapParams.entrySet());

    } else {
        Toast.makeText(activity, "Something went wrong, Try again.", Toast.LENGTH_LONG).show();
    }
}

/**
 * Posting Data on PayUMoney Site with Form
 *
 * @param webView
 * @param url
 * @param postData
 */
public void webViewClientPost(WebView webView, String url, Collection> postData) {
    StringBuilder sb = new StringBuilder();
    sb.append("");
    sb.append("");
    sb.append(String.format("
", url, "post"));
    for (Map.Entry item : postData) {
        sb.append(String.format("", item.getKey(), item.getValue()));
    }
    sb.append("");
    Log.d("TAG", "webViewClientPost called: " + sb.toString());
    webView.loadData(sb.toString(), "text/html", "utf-8");
}


/**
 * Hash Key Calculation
 *
 * @param type
 * @param str
 * @return
 */
public String hashCal(String type, String str) {
    byte[] hashSequence = str.getBytes();
    StringBuffer hexString = new StringBuffer();
    try {
        MessageDigest algorithm = MessageDigest.getInstance(type);
        algorithm.reset();
        algorithm.update(hashSequence);
        byte messageDigest[] = algorithm.digest();

        for (int i = 0; i < messageDigest.length; i++) {
            String hex = Integer.toHexString(0xFF & messageDigest[i]);
            if (hex.length() == 1)
                hexString.append("0");
            hexString.append(hex);
        }
    } catch (NoSuchAlgorithmException NSAE) {
    }
    return hexString.toString();
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == android.R.id.home) {
        onPressingBack();
    }
    return super.onOptionsItemSelected(item);
}

@Override
public void onBackPressed() {
    onPressingBack();
}

/**
 * On Pressing Back
 * Giving Alert...
 */
private void onPressingBack() {
    final Intent intent;
    if (isFromOrder)
        intent = new Intent(PayUMoneyActivity.this, ProductInCartList.class);
    else
        intent = new Intent(PayUMoneyActivity.this, MainActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(PayUMoneyActivity.this);
    alertDialog.setTitle("Warning");
    alertDialog.setMessage("Do you cancel this transaction?");
    alertDialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            finish();
            startActivity(intent);
        }
    });
    alertDialog.setNegativeButton("No", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });
    alertDialog.show();
}

public class PayUJavaScriptInterface {
    Context mContext;

    PayUJavaScriptInterface(Context c) {
        mContext = c;
    }

    public void success(long id, final String paymentId) {

        mHandler.post(new Runnable() {

            public void run() {

                mHandler = null;
                Toast.makeText(PayUMoneyActivity.this, "Payment Successfully.", Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(PayUMoneyActivity.this, MainActivity.class);

                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);

                intent.putExtra("result", "success");

                intent.putExtra("paymentId", paymentId);

                startActivity(intent);

                finish();

            }

        });

    }
}


public void progressBarVisibilityPayuChrome(int visibility) {
    if (getApplicationContext() != null && !isFinishing()) {
        if (visibility == View.GONE || visibility == View.INVISIBLE) {
            if (progressDialog != null && progressDialog.isShowing())
                progressDialog.dismiss();
        } else if (progressDialog == null || !progressDialog.isShowing()) {
            progressDialog = showProgress(this);
        }
    }
}

public ProgressDialog showProgress(Context context) {
    if (getApplicationContext() != null && !isFinishing()) {
        LayoutInflater mInflater = LayoutInflater.from(context);
        final Drawable[] drawables = {getResources().getDrawable(R.drawable.l_icon1),
                getResources().getDrawable(R.drawable.l_icon2),
                getResources().getDrawable(R.drawable.l_icon3),
                getResources().getDrawable(R.drawable.l_icon4)
        };

        View layout = mInflater.inflate(R.layout.prog_dialog, null);
        final ImageView imageView;
        imageView = (ImageView) layout.findViewById(R.id.imageView);
        ProgressDialog progDialog = new ProgressDialog(context, R.style.ProgressDialog);

        final Timer timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
            int i = -1;

            @Override
            synchronized public void run() {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        i++;
                        if (i >= drawables.length) {
                            i = 0;
                        }
                        imageView.setImageBitmap(null);
                        imageView.destroyDrawingCache();
                        imageView.refreshDrawableState();
                        imageView.setImageDrawable(drawables[i]);
                    }
                });

            }
        }, 0, 500);

        progDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
            @Override
            public void onDismiss(DialogInterface dialog) {
                timer.cancel();
            }
        });
        progDialog.show();
        progDialog.setContentView(layout);
        progDialog.setCancelable(true);
        progDialog.setCanceledOnTouchOutside(false);
        return progDialog;
    }
    return null;
}
}

prog_dialog.xml

activity_payumoney.xml

background_drawable.xml