downloadFile static method

Future<List<int>> downloadFile(String url, { dynamic onProgress(int downloadedLength, int contentLength, double progress)?, })

Implementation

static Future<List<int>> downloadFile(
  String url, {
  Function(
    int downloadedLength,
    int contentLength,
    double progress,
  )? onProgress,
}) async {
  var client = HttpClient();
  try {
    var request = await client.getUrl(Uri.parse(url));
    var response = await request.close();
    if (response.statusCode == 200) {
      var bytes = <int>[];
      var contentLength = response.contentLength;
      var downloadedLength = 0;
      await for (var part in response) {
        bytes.addAll(part);
        downloadedLength += part.length;
        if (onProgress != null && contentLength > 0) {
          onProgress(
            downloadedLength,
            contentLength,
            (downloadedLength / contentLength) * 100,
          );
        }
      }
      return bytes;
    } else {
      throw HttpException('Failed to download file from $url');
    }
  } finally {
    client.close();
  }
}