Creating an OTP Input Field in Flutter Using `otp_pin_field`

Introduction

Welcome to this tutorial on creating a custom OTP input field in Flutter using the otp_pin_field package. OTP (One Time Password) is widely used for authentication purposes in various applications. In this blog, we will explore how to integrate and customize the otp_pin_field package in your Flutter application.

Table of Contents

• What is OTP (One Time Password)?
• Why do we need OTP in mobile applications?
• Benefits of Using OTP
• Setting Up Your Flutter Project
• Installing otp_pin_field
• Basic Usage of otp_pin_field
• Customizing the OTP Field
• Handling OTP Submission
• Conclusion

1. What is OTP (One Time Password)?

OTP stands for One Time Password. It is a unique code generated for a single transaction or login session and is usually valid for a short period. OTPs are commonly used for two-factor authentication to enhance security.

2. Why do we need OTP in mobile applications?

In mobile applications, ensuring the security of user data is crucial. OTPs serve several purposes:

• Account Verification: Verifying that the person registering is the legitimate owner of the provided mobile number or email.
• Password Resets: Confirming the user’s identity before allowing them to reset their password.
• Transaction Verification: Adding an extra layer of security for financial transactions or sensitive actions.

3. Benefits of Using OTP

Using OTPs provides several benefits:

• Enhanced Security: OTPs add an additional layer of security beyond a username and password.
• Fraud Prevention: Reduces the risk of unauthorized access and potential fraud.
• User Convenience: Offers a simple and quick verification process for users.
• Versatility: Can be used for various purposes like login, registration, and transaction verification.

4. Setting Up Your Flutter Project

To get started, create a new Flutter project. Open your terminal and run:

flutter create otp_example
cd otp_example

5. Installing otp_pin_field

Add the otp_pin_field package to your pubspec.yaml file:

dependencies:
  flutter:
    sdk: flutter
  otp_pin_field: ^x.x.x # Use the latest version

6. Basic Usage of otp_pin_field

To use otp_pin_field, import the package and add the OTP field to your widget tree:

import 'package:flutter/material.dart';
import 'package:otp_pin_field/otp_pin_field.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('OTP Field Example'),
        ),
        body: Center(
          child: OtpPinField(
            length: 4,
            onSubmit: (String pin) {
              print("OTP Entered: $pin");
            },
          ),
        ),
      ),
    );
  }
}

7. Customizing the OTP Field

You can customize the appearance of the OTP field using various properties provided by the package. Here’s an example:

OtpPinField(
  length: 6,
  fieldWidth: 50.0,
  fieldStyle: FieldStyle.box,
  outlineBorderRadius: 15.0,
  onSubmit: (String pin) {
    print("OTP Entered: $pin");
  },
  otpFieldStyle: OtpFieldStyle(
    backgroundColor: Colors.blue.shade50,
    borderColor: Colors.blue,
  ),
);

8. Handling OTP Submission

To handle OTP submission, you can use the onSubmit callback provided by the OtpPinField widget. This callback returns the entered OTP, which you can then process as needed.

OtpPinField(
  length: 4,
  onSubmit: (String pin) {
    // Handle OTP submission
    print("OTP Entered: $pin");
  },
);

9. Conclusion

The otp_pin_field package makes it easy to implement OTP input fields in your Flutter applications. With its extensive customization options, you can tailor the OTP field to match your app's design perfectly.

For more detailed information, you can refer to the official documentation.

Additional Resources

• Flutter Documentation
• otp_pin_field Package

Video Tutorial

For a more detailed walkthrough, check out this video tutorial:

https://user-images.githubusercontent.com/37922543/233455524-43332b0b-c315-46f8-b4bf-8a64e1786108.gif

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❤❤ Thanks for reading!!! ❤❤

GitHub - shivbo96/otp_pin_field: A flutter package which will help you to generate pin code fields…