flutter_multiple_downloader

A Flutter package for multiple concurrent downloads with chunk-based downloading support. This package supports null safety and is compatible with Flutter 3.10+.

Features

• Multiple Concurrent Downloads: Download files using multiple concurrent connections
• Chunk-based Downloading: Split large files into chunks for efficient downloading
• Progress Tracking: Monitor download progress with percentage callbacks
• Stream Support: Use streams for real-time download progress updates
• Null Safety: Fully supports Dart null safety
• Error Handling: Comprehensive error handling for network issues

Installation

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

dependencies:
  flutter_multiple_downloader: ^1.0.0

Usage

Basic Download

import 'package:flutter_multiple_downloader/flutter_multiple_downloder.dart';

// Create a downloader instance
final downloader = Downloader(
  'https://example.com/large-file.zip',
  chunkSize: 1024 * 1024, // 1MB chunks
  p: 3, // 3 concurrent connections
);

// Download with progress callback
await downloader.download(
  onPercentage: (done, total) {
    print('Downloaded: $done/$total chunks');
  },
);

// Get the downloaded data
if (downloader.noError) {
  final data = downloader.state.asList();
  print('Downloaded ${data.length} bytes');
}

// Clean up
downloader.markFinished();

Stream-based Download

// Get download stream
final stream = await downloader.downStream();

// Listen to progress updates
await for (final state in stream) {
  print('Progress: ${state.successCount}/${state.chunks.length}');
}

// Check if download was successful
if (downloader.noError) {
  final data = downloader.state.asList();
  // Process downloaded data
}

Configuration

Downloader Parameters

• url: The URL of the file to download
• chunkSize: Size of each download chunk (default: 501001 bytes)
• p: Number of concurrent connections (default: 2)

Error Handling

The package throws specific exceptions:

• UnsupportedException: When the server doesn't support range requests
• DownloadFailureException: When download fails due to network issues

Requirements

• Dart SDK: >=3.0.0 <4.0.0
• Flutter: >=3.10.0

License

This project is licensed under the terms specified in the LICENSE file.