How to generate a QR code for UPI payment and listen to UPI transaction status in android java

To generate a QR code for UPI payment in an Android app using Java, you can use the QRGen library. Here is an example of how to generate a QR code for UPI payment:

  1. Add the QRGen library to your app’s build.gradle file:
implementation 'net.glxn:qrgen:1.4'
  1. Import the QRGen library in your Java code:
import net.glxn.qrgen.android.QRCode;
  1. Use the QRCode class to generate the QR code image. The following code generates a QR code image for a UPI payment request with the specified payment address and amount:
String paymentAddress = "upi://pay?pa=example@upi&pn=Merchant Name&am=10.00&cu=INR&url=https://merchant.com";

Bitmap qrCodeImage = QRCode.from(paymentAddress).bitmap();
  1. To display the QR code image in an ImageView, you can use the setImageBitmap method:
ImageView imageView = findViewById(R.id.qr_code_image_view);
imageView.setImageBitmap(qrCodeImage);

To listen for UPI transaction status in an Android app, you can use the UPI Intents API. This API allows you to receive updates about the status of UPI transactions initiated by your app.

Here is an example of how to use the UPI Intents API to listen for UPI transaction status in an Android app:

  1. Add the UPI Intents API to your app’s build.gradle file:
implementation 'com.google.android.gms:play-services-wallet:18.0.0'
  1. Import the UPI Intents API in your Java code:
import com.google.android.gms.wallet.PaymentsClient;
import com.google.android.gms.wallet.Wallet;
import com.google.android.gms.wallet.WalletConstants;
  1. Create a PaymentsClient object to send requests to the UPI Intents API:
PaymentsClient paymentsClient = Wallet.getPaymentsClient(
    this,
    new Wallet.WalletOptions.Builder()
        .setEnvironment(WalletConstants.ENVIRONMENT_TEST)
        .build());
  1. Use the paymentsClient.isReadyToPay method to check if the device is ready to make UPI payments. If the device is ready, you can proceed with the payment.
  2. Use the paymentsClient.loadPaymentData method to initiate the UPI payment. This method will open the UPI payment app on the device, allowing the user to complete the payment.
  3. To listen for updates about the UPI transaction status, you can use the OnPaymentDataChanged listener. The following code shows how to set up the listener:
paymentsClient.registerPaymentDataChangedListener(new OnPaymentDataChanged() {
    @Override
    public void onPaymentDataChanged(PaymentData paymentData) {
        // Handle updates about the transaction status here