Copy asset from bundle to file system

Question

I'm trying to copy an sqlite database from the root bundle onto the file system in order to use it.

I've tried many different ways but it always ended up writing incorrect amounts of data to disk. The code I'm using looks like this:

Directory appDocDir = await getExternalStorageDirectory();
String path = join(appDocDir.path, "data.db");
bool exists = await new File(path).exists();
if (!exists) {
  var out = new File(path).openWrite();

  var data = await rootBundle.load("assets/data.sqlite");
  var list = data.buffer.asUint8List();
  out.write(list);
  out.close();
}

Answer 1

I was able to do that by the followings.

ByteData data = await rootBundle.load("data.sqlite");
List<int> bytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);

Directory appDocDir = await getApplicationDocumentsDirectory()
String path = join(appDocDir.path, "data.db");
await File(path).writeAsBytes(bytes);