Tuesday, 14 May 2019

HB Blog 167: How To Integrate Google Pay Payment Gateway In Android.

Google Pay  is a digital wallet platform and online payment system developed by Google to power in-app and tap-to-pay purchases on mobile devices, enabling users to make payments with Android phones, tablets or watches.

Google Pay uses Near Field Communication (NFC) to transmit card information facilitating funds transfer to the retailer. It replaces the credit or debit card chip and PIN or magnetic stripe transaction at point-of-sale terminals by allowing the user to upload these in the Google Pay wallet. It is similar to contactless payments already used in many countries, with the addition of two-factor authentication. The service lets Android devices wirelessly communicate with point of sale systems using a near field communication (NFC) antenna, host-based card emulation (HCE), and Android's security.

Google Pay takes advantage of physical authentications such as fingerprint ID where available. On devices without fingerprint ID, Google Pay is activated with a passcode. When the user makes a payment to a merchant, Google Pay does not send the credit or debit card number with the payment. Instead it generates a virtual account number representing the user's account information. This service keeps customer payment information private, sending a one-time security code instead of the card or user details.


Refer the below link for complete sample code:-

Download Sample Code

Have a look on few code snippets,

 //build.gradle
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apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.elitetechnologies.googlepay"
        minSdkVersion 20
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.razorpay:checkout:1.5.1'
}

//activity_main.xml
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00b1e1"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:orientation="vertical"
        android:gravity="center"
        >

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="110dp"
            >

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="80dp"
                android:layout_alignParentBottom="true"
                android:background="#E2E2E2"
                android:gravity="center"
                >

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:paddingTop="35dp"
                    android:paddingBottom="0dp"
                    android:textSize="12sp"
                    android:text="Order #RZP42"
                    />

            </LinearLayout>

            <ImageView
                android:layout_width="60dp"
                android:layout_height="60dp"
                android:layout_centerHorizontal="true"
                android:background="#FFFFFF"
                android:src="@mipmap/ic_launcher"
                />

        </RelativeLayout>

        <LinearLayout
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:orientation="vertical"
            android:paddingTop="15dp"
            android:background="#f2f2f2"
            android:gravity="center"
            >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:paddingTop="0dp"
                android:paddingBottom="5dp"
                android:textSize="20sp"
                android:text="Razorpay T-Shirt"
                />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:paddingTop="0dp"
                android:paddingBottom="0dp"
                android:textSize="12sp"
                android:text="INR 1.00"
                />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:paddingTop="5dp"
                android:paddingBottom="0dp"
                android:textSize="12sp"
                android:textStyle="italic"
                android:text="This is a real transaction"
                />

            <Button
                android:id="@+id/btn_pay"
                android:layout_width="wrap_content"
                android:layout_height="36dp"
                android:layout_marginTop="20dp"
                android:layout_marginBottom="20dp"
                android:layout_gravity="center_horizontal"
                android:paddingRight="20dp"
                android:paddingLeft="20dp"
                android:background="@drawable/green_button"
                android:textSize="14sp"
                android:textColor="#fcfcfc"
                android:text="Purchase"
                />

        </LinearLayout>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:paddingTop="10dp"
            android:paddingBottom="10dp"
            android:paddingLeft="20dp"
            android:paddingRight="20dp"
            android:background="@drawable/secured_by_bg"
            android:textSize="12sp"
            android:textColor="#a1ddee"
            android:textStyle="italic"
            android:text="Secure Payments by Razorpay"
            />

    </LinearLayout>

</RelativeLayout>

//MainActivity.java
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package com.elitetechnologies.googlepay;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.razorpay.Checkout;
import com.razorpay.PaymentResultListener;

import org.json.JSONObject;

public class MainActivity extends Activity implements PaymentResultListener {
    private static final String TAG = MainActivity.class.getSimpleName();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        /*
         To ensure faster loading of the Checkout form,
          call this method as early as possible in your checkout flow.
         */
        Checkout.preload(getApplicationContext());

        // Payment button created by you in XML layout
        Button button = (Button) findViewById(R.id.btn_pay);

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

    public void startPayment() {
        /*
          You need to pass current activity in order to let Razorpay create CheckoutActivity
         */
        final Activity activity = this;

        final Checkout co = new Checkout();

        try {
            JSONObject options = new JSONObject();
            options.put("name", "Razorpay Corp");
            options.put("description", "Demoing Charges");
            //You can omit the image option to fetch the image from dashboard
            options.put("image", "https://s3.amazonaws.com/rzp-mobile/images/rzp.png");
            options.put("currency", "INR");
            options.put("amount", "100");

            JSONObject preFill = new JSONObject();
            preFill.put("email", "test@razorpay.com");
            preFill.put("contact", "9876543210");

            options.put("prefill", preFill);

            co.open(activity, options);
        } catch (Exception e) {
            Toast.makeText(activity, "Error in payment: " + e.getMessage(), Toast.LENGTH_SHORT)
                    .show();
            e.printStackTrace();
        }
    }

    /**
     * The name of the function has to be
     * onPaymentSuccess
     * Wrap your code in try catch, as shown, to ensure that this method runs correctly
     */
    @SuppressWarnings("unused")
    @Override
    public void onPaymentSuccess(String razorpayPaymentID) {
        try {
            Toast.makeText(this, "Payment Successful: " + razorpayPaymentID, Toast.LENGTH_SHORT).show();
        } catch (Exception e) {
            Log.e(TAG, "Exception in onPaymentSuccess", e);
        }
    }

    /**
     * The name of the function has to be
     * onPaymentError
     * Wrap your code in try catch, as shown, to ensure that this method runs correctly
     */
    @SuppressWarnings("unused")
    @Override
    public void onPaymentError(int code, String response) {
        try {
            Toast.makeText(this, "Payment failed: " + code + " " + response, Toast.LENGTH_SHORT).show();
        } catch (Exception e) {
            Log.e(TAG, "Exception in onPaymentError", e);
        }
    }
}
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