Implementing reCAPTCHA Verification in Flutter App

Introduction

• Tutorial on implementing reCAPTCHA verification in a Flutter app.
• Demo app created with a reCAPTCHA view for verification.
• Successful verification redirects to a welcome page.

Step 1: Create API Key for reCAPTCHA

• Go to Google reCAPTCHA (link provided in the description).
• Create a new project:
  • Name it "try".
  • Select reCAPTCHA version 2 ("I am not a robot" checkbox).
  • Specify your domain name (ensure it's your own).
• Accept terms and conditions and create the project.
• Note the API keys generated for your app.

Step 2: Set Up Flutter Project

• Open Android Studio and create a new Flutter project.
• Remove default counter code; keep it simple with an empty container.
• Create an HTML page for reCAPTCHA verification.

Step 3: Add Required Library

• Edit pubspec.yaml file to add necessary dependencies.
• Add the library for loading HTML pages (webview_flutter).
• Run flutter pub get to install the library.

Step 4: Load HTML Page in Flutter

• Import the library in main.dart.
• Use WebViewPlus to load the web page:
  • Enable JavaScript: JavascriptMode.unrestricted.
  • Load your website URL: protocol.spoint.com.
• Ensure permissions are set in the Android Manifest for internet access.

Step 5: Load Local HTML File

• Create an assets directory with a webpages subdirectory.
• Create index.html file with a sample HTML structure.
• Provide access to assets in pubspec.yaml.
• Load local HTML file in WebViewPlus.
• Run flutter pub get again if necessary.

Step 6: Implement reCAPTCHA Widget

• Replace sample HTML with reCAPTCHA widget in index.html.
• Include the reCAPTCHA API script with the generated key.

Step 7: Handle Successful Verification

• Set up JavaScript channel to receive messages from the web view.
• On successful verification, navigate to a welcome page (home_page.dart).
• Create home_page.dart for the welcome page.

Conclusion

• Verify the reCAPTCHA and ensure redirection to the welcome page works correctly.
• Source code and additional resources provided in the description.
• Encourage viewers to subscribe and follow Protocol as Point.