Adding UPI payment to android app using android studio ,UPI (Unified payment interface) integration android

Question

I am trying to add Upi payment to android app to pay the bill automatically for coffee ordering app(digital payment) . I searched in google but it didn't work. So anyone can explain me the steps in detail.

Answer 1

For one tap payment just open url using intent, this will show you installed app on your device which are supporting UPI Payment, check the following lines of code

Uri uri = Uri.parse("upi://pay?pa=yourupiid&pn=Yadav%20Basant&tn=Testing%20by%20Yadav%20Basant&am=1&cu=INR&url=https://pay2all.in");
                
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivityForResult(intent, 1421);

and for response check onActivityResult

 @Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode==1421)
    {
        if (resultCode==RESULT_OK)
        {
             assert data != null;
            Log.e("data","response "+data.getStringExtra("response"));

            Toast.makeText(this, "response : "+data.getStringExtra("response"), Toast.LENGTH_LONG).show();



        }
    }
}
            

Answer 2

Create a button which will trigger the intent to open the new activity called upi. Follow these steps carefully 1. To open the upi activity create a activity named bill.xml and bill.java

bill.xml

<Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="188dp"
        android:layout_marginBottom="28dp"
        android:text="Pay"
        android:onClick="pay"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.955"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.726" />
</androidx.constraintlayout.widget.ConstraintLayout>

bill.java

package com.example.smart_park;
import com.example.smart_park.Starttimer;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class bill extends AppCompatActivity {
double total_price=89.78;



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

    }
    public void pay(View view){   //this will be triggered when button is clicked
        Intent myIntent = new Intent(getApplicationContext(),upi.class);
        //ADD the data into bundle and send

        Bundle bundle = new Bundle();  //create a bundle and send it to activity called upi class.
        bundle.putString("stuffs", Double.toString(total_price));
        myIntent.putExtras(bundle);
        startActivity(myIntent);      //for more details refer stackoverflow how to send data from one activity to other

    }


}

Now create upi activity FILE-->NEW-->ACTIVITY-->Empty Activity-->Activity name:upi --> click ok

Now add these to upi.xml

upi.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".upi">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Amount"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="20dp"
        android:id="@+id/amount_et"
        android:inputType="number"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="UPI ID"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="20dp"
        android:id="@+id/upi_id"
        android:layout_below="@+id/amount_et"
        android:focusable="false"
        android:text="1234@ybl"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Name"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="20dp"
        android:id="@+id/name"
        android:layout_below="@+id/upi_id"
        android:focusable="false"
        android:text="Rakshit"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Note"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="20dp"
        android:id="@+id/note"
        android:focusable="false"
        android:layout_below="@+id/name"
        android:text="Fees charged"/>

    <Button
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        android:textColor="#fff"
        android:id="@+id/send"
        android:layout_below="@+id/note"
        android:layout_marginTop="20dp"
        android:layout_centerHorizontal="true"
        android:text="send by upi"/>

</RelativeLayout>

Replace 1234@ybl with recievers upi id xxxxxx@ybl or any other upi id

upi.java

package com.example.coffee1;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.ArrayList;

public class upi extends AppCompatActivity {
    EditText amountEt, noteEt, nameEt, upiIdEt;
    Button send;

    final int UPI_PAYMENT = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_upi);
        initializeViews();
        Bundle bundle = getIntent().getExtras();
        String stuffs = bundle.getString("stuffs");  //price recieved from previous activity is fetched here
        Toast.makeText(getApplicationContext(), "stuff"+stuffs, Toast.LENGTH_SHORT).show();
        amountEt.setText(stuffs);


        send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //Getting the values from the EditTexts




                String amount = amountEt.getText().toString();
                String note = noteEt.getText().toString();

                String name = nameEt.getText().toString();
                String upiId = upiIdEt.getText().toString();
                //upiIdEt.setFocusable(false);
                payUsingUpi(amount, upiId, name, note);
            }
        });
    }

    void initializeViews() {
        send = findViewById(R.id.send);
        amountEt = findViewById(R.id.amount_et);
        noteEt = findViewById(R.id.note);
        nameEt = findViewById(R.id.name);
        upiIdEt = findViewById(R.id.upi_id);
    }

    void payUsingUpi(String amount, String upiId, String name, String note) {

        Uri uri = Uri.parse("upi://pay").buildUpon()
                .appendQueryParameter("pa", upiId)
                .appendQueryParameter("pn", name)
                .appendQueryParameter("tn", note)
                .appendQueryParameter("am", amount)
                .appendQueryParameter("cu", "INR")
                .build();


        Intent upiPayIntent = new Intent(Intent.ACTION_VIEW);
        upiPayIntent.setData(uri);

        // will always show a dialog to user to choose an app
        Intent chooser = Intent.createChooser(upiPayIntent, "Pay with");

        // check if intent resolves
        if(null != chooser.resolveActivity(getPackageManager())) {
            startActivityForResult(chooser, UPI_PAYMENT);
        } else {
            Toast.makeText(this,"No UPI app found, please install one to continue",Toast.LENGTH_SHORT).show();
        }

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        switch (requestCode) {
            case UPI_PAYMENT:
                if ((RESULT_OK == resultCode) || (resultCode == 11)) {
                    if (data != null) {
                        String trxt = data.getStringExtra("response");
                        //Log.d("UPI", "onActivityResult: " + trxt);
                        ArrayList<String> dataList = new ArrayList<>();
                        dataList.add(trxt);
                        upiPaymentDataOperation(dataList);
                    } else {
                        //Log.d("UPI", "onActivityResult: " + "Return data is null");
                        ArrayList<String> dataList = new ArrayList<>();
                        dataList.add("nothing");
                        upiPaymentDataOperation(dataList);
                    }
                } else {
                    //Log.d("UPI", "onActivityResult: " + "Return data is null"); //when user simply back without payment
                    ArrayList<String> dataList = new ArrayList<>();
                    dataList.add("nothing");
                    upiPaymentDataOperation(dataList);
                }
                break;
        }
    }

    private void upiPaymentDataOperation(ArrayList<String> data) {
        if (isConnectionAvailable(upi.this)) {
            String str = data.get(0);
            //Log.d("UPIPAY", "upiPaymentDataOperation: "+str);
            String paymentCancel = "";
            if(str == null) str = "discard";
            String status = "";
            String approvalRefNo = "";
            String response[] = str.split("&");
            for (int i = 0; i < response.length; i++) {
                String equalStr[] = response[i].split("=");
                if(equalStr.length >= 2) {
                    if (equalStr[0].toLowerCase().equals("Status".toLowerCase())) {
                        status = equalStr[1].toLowerCase();
                    }
                    else if (equalStr[0].toLowerCase().equals("ApprovalRefNo".toLowerCase()) || equalStr[0].toLowerCase().equals("txnRef".toLowerCase())) {
                        approvalRefNo = equalStr[1];
                    }
                }
                else {
                    paymentCancel = "Payment cancelled by user.";
                }
            }

            if (status.equals("success")) {
                //Code to handle successful transaction here.
                Toast.makeText(upi.this, "Transaction successful.", Toast.LENGTH_SHORT).show();
                // Log.d("UPI", "responseStr: "+approvalRefNo);
                Toast.makeText(this, "YOUR ORDER HAS BEEN PLACED\n THANK YOU AND ORDER AGAIN", Toast.LENGTH_LONG).show();
            }
            else if("Payment cancelled by user.".equals(paymentCancel)) {
                Toast.makeText(upi.this, "Payment cancelled by user.", Toast.LENGTH_SHORT).show();
            }
            else {
                Toast.makeText(upi.this, "Transaction failed.Please try again", Toast.LENGTH_SHORT).show();
            }
        } else {
            Toast.makeText(upi.this, "Internet connection is not available. Please check and try again", Toast.LENGTH_SHORT).show();
        }
    }

    public static boolean isConnectionAvailable(Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivityManager != null) {
            NetworkInfo netInfo = connectivityManager.getActiveNetworkInfo();
            if (netInfo != null && netInfo.isConnected()
                    && netInfo.isConnectedOrConnecting()
                    && netInfo.isAvailable()) {
                return true;
            }
        }
        return false;
    }
}

YOU CAN ADD YOUR LOGIC HERE WHAT TO DO IF THE PAYMENT IS SUCCESSFUL

if (status.equals("success")) {
                //Code to handle successful transaction here.
                Toast.makeText(upi.this, "Transaction successful.", Toast.LENGTH_SHORT).show(); //TOAST THAT PAYMENT IS SUCCESSFUL
                // Log.d("UPI", "responseStr: "+approvalRefNo);
                Toast.makeText(this, "YOUR ORDER HAS BEEN PLACED\n THANK YOU AND ORDER AGAIN", Toast.LENGTH_LONG).show();
            }

HURRAY DONE WITH THE PAYMENT

NOTE: ONLY FOR GOOGLE PAY IT IS WORKING

FOR PHONEPE AND OTHER EVEN IF THE PAYMENT IS SUCCESSFUL IT IS TELLING PAYMENT FAILED.