downloadApk static method

Implementation

static Future<String> downloadApk(String url, String? fileName) async {
  Completer<String> completer = Completer();

  var httpClient = http.Client();
  var request = http.Request('GET', Uri.parse(url));
  var response = httpClient.send(request);

  String dir = (await getTemporaryDirectory()).path;

  List<List<int>> chunks = List.empty(growable: true);

  response.asStream().listen((http.StreamedResponse r) {
    r.stream.listen((List<int> chunk) {
      chunks.add(chunk);
    },
        onError: (err, trace) {
          completer.completeError(err);
        },
        onDone: () async {
          var path = '$dir/${fileName ?? 'update'}.apk';
          File file = File(path);
          if(await file.exists()) {
            await file.delete();
          }
          final Uint8List bytes = Uint8List(r.contentLength!);
          int offset = 0;
          for (List<int> chunk in chunks) {
            bytes.setRange(offset, offset + chunk.length, chunk);
            offset += chunk.length;
          }
          await file.writeAsBytes(bytes);
          completer.complete(path);
        });
  });

  return completer.future;
}