PayPal Integration

Here i show you how to make PayPal Integration in android application.

Add Paypal sdk library in build.gradle(Module: app) file in your application.

implementation 'com.paypal.sdk:paypal-android-sdk:2.15.3'

Now , in your design layout activity_main.xml file add edittext for enter amount value and Pay button.

<?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"
    >

    <LinearLayout
        android:id="@+id/linearLayout"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_centerVertical="true">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Enter Amount"
             />

        <EditText
            android:id="@+id/edtAmount"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
             />

        <Button
            android:id="@+id/btnPay"
            android:text="Pay Now"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

    </LinearLayout>


</RelativeLayout>

Now make another design layout for confirmation of payment information, make activity_confirmation.xml

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

    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">

        <TableRow>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Payment Amount : " />

            <TextView
                android:id="@+id/paymentAmount"
                android:layout_width="wrap_content"
                android:textStyle="bold"
                android:layout_height="wrap_content" />
        </TableRow>

        <TableRow>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Status : " />

            <TextView
                android:id="@+id/paymentStatus"
                android:layout_width="wrap_content"
                android:textStyle="bold"
                android:layout_height="wrap_content" />
        </TableRow>

        <TableRow>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Payment Id : " />

            <TextView
                android:id="@+id/paymentId"
                android:textStyle="bold"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </TableRow>


    </TableLayout>

</RelativeLayout>

Now, Java code in MainActivity.java file

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import com.paypal.android.sdk.payments.PayPalConfiguration;
import com.paypal.android.sdk.payments.PayPalPayment;
import com.paypal.android.sdk.payments.PayPalService;
import com.paypal.android.sdk.payments.PaymentActivity;
import com.paypal.android.sdk.payments.PaymentConfirmation;

import org.json.JSONException;

import java.math.BigDecimal;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{


   public static final String PAYPAL_CLIENT_ID = "PAYPAL CLIENT-ID HERE";

    //The views
    private Button btnPay;
    private EditText edtAmount;

    //Payment Amount
    private String paymentAmount;


    //Paypal intent request code to track onActivityResult method
    public static final int PAYPAL_REQUEST_CODE = 123;


    //Paypal Configuration Object
    private static PayPalConfiguration config = new PayPalConfiguration()
            // Start with mock environment.  When ready, switch to sandbox (ENVIRONMENT_SANDBOX)
            // or live (ENVIRONMENT_PRODUCTION)
            .environment(PayPalConfiguration.ENVIRONMENT_NO_NETWORK)
            .clientId(PAYPAL_CLIENT_ID);



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

        btnPay = (Button) findViewById(R.id.btnPay);
        edtAmount = (EditText) findViewById(R.id.edtAmount);

        btnPay.setOnClickListener(MainActivity.this);

        Intent intent = new Intent(this, PayPalService.class);

        intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, config);

        startService(intent);
    }

    @Override
    public void onDestroy() {
        stopService(new Intent(this, PayPalService.class));
        super.onDestroy();
    }

    private void getPayment() {
        //Getting the amount from editText
        paymentAmount = edtAmount.getText().toString();

        //Creating a paypalpayment
        PayPalPayment payment = new PayPalPayment(new BigDecimal(String.valueOf(paymentAmount)), "USD", "Test Payment",
                PayPalPayment.PAYMENT_INTENT_SALE);

        //Creating Paypal Payment activity intent
        Intent intent = new Intent(this, PaymentActivity.class);

        //putting the paypal configuration to the intent
        intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, config);

        //Puting paypal payment to the intent
        intent.putExtra(PaymentActivity.EXTRA_PAYMENT, payment);

        //Starting the intent activity for result
        //the request code will be used on the method onActivityResult
        startActivityForResult(intent, PAYPAL_REQUEST_CODE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        //If the result is from paypal
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == PAYPAL_REQUEST_CODE) {

            //If the result is OK i.e. user has not canceled the payment
            if (resultCode == Activity.RESULT_OK) {
                //Getting the payment confirmation
                PaymentConfirmation confirm = data.getParcelableExtra(PaymentActivity.EXTRA_RESULT_CONFIRMATION);

                //if confirmation is not null
                if (confirm != null) {
                    try {
                        //Getting the payment details
                        String paymentDetails = confirm.toJSONObject().toString(4);
                        Log.i("payment_Example", paymentDetails);

                        //Starting a new activity for the payment details and also putting the payment details with intent
                        startActivity(new Intent(this, PayconfirmationActivity.class)
                                .putExtra("Payment_Details", paymentDetails)
                                .putExtra("Payment_Amount", paymentAmount));

                    } catch (JSONException e) {
                        Log.e("payment_Example", "error occurred: ", e);
                    }
                }
            } else if (resultCode == Activity.RESULT_CANCELED) {
                Log.i("payment_Example", "The user canceled.");
            } else if (resultCode == PaymentActivity.RESULT_EXTRAS_INVALID) {
                Log.i("payment_Example", "An invalid Payment or PayPalConfiguration was submitted.");
            }
        }
    }

    @Override
    public void onClick(View v) {
        getPayment();
    }
}

And Make another PayconformationActivity.java for display confirmation of Payment. and define this .java file in Manifest file also. 

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

import org.json.JSONException;
import org.json.JSONObject;

import androidx.appcompat.app.AppCompatActivity;

public class PayconfirmationActivity extends AppCompatActivity {

    TextView txtid,txtstatus,txtamount;

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

        txtid = (TextView) findViewById(R.id.payment_id);
        txtstatus= (TextView) findViewById(R.id.payment_status);
        txtamount = (TextView) findViewById(R.id.payment_amount);

        Intent intent = getIntent();
        try {
            JSONObject jsonDetails = new JSONObject(intent.getStringExtra("Payment_Details"));

            String payment_amount = intent.getStringExtra("Payment_Amount");

            txtid.setText(jsonDetails.getString("id"));
            txtstatus.setText(jsonDetails.getString("state"));
            txtamount.setText(payment_amount+" USD");

        } catch (JSONException e) {
            Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
        }
    }

}

Now , Here is the Code of this payment integration ,
PayPal Integration Source Code