🔒

Guide to Implement reCAPTCHA in Flutter

Feb 28, 2025

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.