sms_sender_background

SMS Sender Background

A Flutter plugin for sending SMS messages with support for dual SIM cards, permission handling, and multi-part messages.

Features

• Send SMS messages from your Flutter app
• Support for dual SIM cards (specify SIM slot)
• Automatic permission handling (request and check SMS permissions)
• Support for long messages (automatically splits into multi-part messages)
• Error handling and status reporting

Getting Started

Installation

Add this to your package's pubspec.yaml file:

dependencies:
  sms_sender_background: ^1.0.5

Android Setup

Add the following permissions to your Android Manifest (android/app/src/main/AndroidManifest.xml):

<uses-permission android:name="android.permission.SEND_SMS"/>
<!-- Optional: Required only for dual SIM support -->
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

Note about READ_PHONE_STATE permission:

• This permission is optional and only needed if you want to use dual SIM functionality
• If not granted, the plugin will automatically fall back to using the default SIM card
• This ensures the plugin works reliably even on devices with stricter security policies or when distributed outside Google Play

Usage

import 'package:sms_sender_background/sms_sender.dart';;

// Create an instance
final smsSender = SmsSender();

// Check SMS permission
bool hasPermission = await smsSender.checkSmsPermission();

// Request permission if needed
if (!hasPermission) {
  hasPermission = await smsSender.requestSmsPermission();
}

// Optional: Check and request READ_PHONE_STATE permission for dual SIM support
// If not granted, the plugin will use the default SIM card
bool hasPhoneStatePermission = await smsSender.checkPhoneStatePermission();
if (!hasPhoneStatePermission) {
  hasPhoneStatePermission = await smsSender.requestPhoneStatePermission();
}

// Send SMS
if (hasPermission) {
  try {
    bool success = await smsSender.sendSms(
      phoneNumber: '+1234567890',
      message: 'Hello from Flutter!',
      simSlot: 0, // Optional: specify SIM slot (0 or 1)
    );
    print('SMS sent: $success');
  } catch (e) {
    print('Error sending SMS: $e');
  }
}

Additional Features

Dual SIM Support

To send an SMS using a specific SIM card:

// Optional: Request READ_PHONE_STATE permission for dual SIM support
bool hasPhoneStatePermission = await smsSender.checkPhoneStatePermission();
if (!hasPhoneStatePermission) {
  hasPhoneStatePermission = await smsSender.requestPhoneStatePermission();
}

await smsSender.sendSms(
  phoneNumber: '+1234567890',
  message: 'Hello!',
  simSlot: 1, // Use second SIM card
);

Important Notes:

• Dual SIM support requires the READ_PHONE_STATE permission
• If this permission is not granted, the plugin will automatically fall back to using the default SIM card
• This ensures compatibility across all devices, including those with stricter security policies
• The fallback mechanism works reliably even when apps are installed from unknown sources

Long Messages

The plugin automatically handles long messages by splitting them into multiple parts:

await smsSender.sendSms(
  phoneNumber: '+1234567890',
  message: 'A very long message that will be automatically split...',
);

Error Handling

The plugin provides detailed error information through exceptions:

• PlatformException with code "PERMISSION_DENIED" when SMS permission is not granted
• PlatformException with code "INVALID_ARGUMENT" when phone number or message is empty
• PlatformException with code "SMS_SEND_ERROR" when SMS sending fails

Contributing

Feel free to contribute to this project:

1. Fork it
2. Create your feature branch (git checkout -b feature/my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin feature/my-new-feature)
5. Create a new Pull Request

License

This project is licensed under the MIT License - see the LICENSE file for details