Universal Downloader

A Flutter package for downloading files on all platforms: Android, iOS, Web, Windows, macOS, and Linux.

Supports ALL file types - PDFs, music, videos, documents, archives, images, and any other format without restrictions.

Features

✅ Universal Compatibility: Works on all Flutter platforms
✅ All File Types Supported: PDFs, music, videos, documents, archives, images, and any format
✅ Progress Tracking: Real-time download progress callbacks
✅ Platform-Optimized Storage: Uses appropriate directories for each platform
✅ Automatic Permissions: Handles storage permissions for mobile platforms
✅ Error Handling: Comprehensive error reporting and recovery
✅ Simple API: Easy-to-use interface with intuitive callbacks

Installation

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

dependencies:
  universal_downloader: <latest>

Then run:

flutter pub get

Usage

🚀 RECOMMENDED: downloadFromUrlStream() (Best for all use cases)

Use downloadFromUrlStream() for all downloads - it's memory efficient, reliable, and works perfectly across all platforms:

import 'package:universal_downloader/universal_downloader.dart';

// RECOMMENDED: Use this for all downloads
final result = await UniversalDownloader.downloadFromUrlStream(
  url: "https://example.com/file.zip",
  filename: "file.zip",
  onProgress: (progress) {
    print("Progress: ${progress.percentage.toStringAsFixed(1)}%");
    print("Downloaded: ${progress.downloadedBytes}/${progress.totalBytes} bytes");
  },
  onComplete: (filePath) {
    print("✅ Download completed: $filePath");
  },
  onError: (error) {
    print("❌ Download failed: $error");
  },
);

if (result.isSuccess) {
  print("File saved at: ${result.filePath}");
} else {
  print("Error: ${result.errorMessage}");
}

Simple Download (Basic)

import 'package:universal_downloader/universal_downloader.dart';

// Basic download without progress tracking
await UniversalDownloader.downloadFile(
  url: "https://example.com/file.pdf",
  fileName: "document.pdf",
);

Platform Support

Platform	Storage Location	Setup Required	Progress Tracking
Android	Downloads/Documents directory	⚠️ Manifest permissions	✅
iOS	Documents directory	✅ None	✅
Web	Browser downloads	✅ None	✅
Windows	%USERPROFILE%\Downloads	✅ None	✅
macOS	~/Downloads	⚠️ Entitlements	✅
Linux	~/Downloads	✅ None	✅

Platform Setup

✅ Ready to Use (No setup required)

• Windows: Uses USERPROFILE\Downloads automatically
• Linux: Uses HOME/Downloads or XDG directories
• iOS: Uses app Documents directory (sandboxed)
• Web: Uses browser's native download mechanism

⚠️ Setup Required

Android Permissions

Add to android/app/src/main/AndroidManifest.xml:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="32" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="32" />
<uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
<uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
<uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />

macOS Entitlements

Add to macos/Runner/DebugProfile.entitlements and Release.entitlements:

<key>com.apple.security.files.downloads.read-write</key>
<true/>
<key>com.apple.security.files.user-selected.read-write</key>
<true/>
<key>com.apple.security.network.client</key>
<true/>

Web Download (Enhanced for PDFs/Music)

For web-optimized downloads, use downloadUrl() which uses the browser's native download mechanism:

import 'package:universal_downloader/universal_downloader.dart';

// Web-optimized download using browser's native mechanism
await UniversalDownloader.downloadUrl(
  url: "https://example.com/song.mp3",
  filename: "song.mp3",
);

Note: On native platforms, downloadUrl() automatically falls back to downloadFromUrlStream() for better compatibility.

API Reference

Core Methods

downloadFromUrlStream() - 🚀 RECOMMENDED

Downloads files with streaming for better memory efficiency and progress tracking.

static Future<DownloadResult> downloadFromUrlStream({
  required String url,
  required String filename,
  ProgressCallback? onProgress,
  CompleteCallback? onComplete,
  ErrorCallback? onError,
  bool allowSelfSignedCertificate = false,
})

downloadFile()

Simple file download with optional progress tracking and callbacks.

static Future<DownloadResult> downloadFile({
  required String url,
  required String fileName,
  ProgressCallback? onProgress,
  CompleteCallback? onComplete,
  ErrorCallback? onError,
  bool saveToDocuments = false,
  bool allowSelfSignedCertificate = false,
})

downloadStream()

Downloads a file from a Stream and saves it with the given filename.

static Future<void> downloadStream({
  required Stream<int> stream,
  required String filename,
})

downloadData()

Downloads a file from binary data (Uint8List) and saves it with the given filename.

static Future<void> downloadData({
  required Uint8List data,
  required String filename,
})

downloadUrl()

Downloads a file directly from a URL. Web-optimized, uses browser's native download.

static Future<void> downloadUrl({
  required String url,
  String? filename,
})

Utility Getters

supportsDirectorySelection

Checks if the current platform supports directory selection.

static bool get supportsDirectorySelection

supportsProgressTracking

Checks if the current platform supports progress tracking.

static bool get supportsProgressTracking

platformName

Gets the current platform name.

static String get platformName

Models

DownloadProgress

class DownloadProgress {
  final int totalBytes;
  final int downloadedBytes;
  final double percentage;
  final double? speed;
}

DownloadResult

class DownloadResult {
  final String filePath;
  final String url;
  final String fileName;
  final int totalBytes;
  final bool isSuccess;
  final String? errorMessage;
}

Error Handling

try {
  await UniversalDownloader.downloadFromUrlStream(
    url: "https://example.com/file.zip",
    filename: "file.zip",
  );
} on NetworkDownloadException catch (e) {
  print("Network error: $e");
} on PermissionDownloadException catch (e) {
  print("Permission error: $e");
} on DownloadException catch (e) {
  print("Download error: $e");
}

Example

Check out the example directory for a complete Flutter app:

cd example
flutter pub get
flutter run

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Issues & Support

If you encounter any issues or need support, please create an issue on GitHub.

License

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