How to save Base64 String to file and view it using Flutter

Question

I need to download and view file (if possible, for Image, PDF, etc) using Flutter. My problem is, the file that I want to download is Base64 String. How can I achieve that using Flutter??

Solution

Following is the code snippet to decode base64 string and save it as a file on the local device. please note in terms of viewing files, image and pdf would require different libraries.

Future<String> _createFileFromString() async {
final encodedStr = "put base64 encoded string here";
Uint8List bytes = base64.decode(encodedStr);
String dir = (await getApplicationDocumentsDirectory()).path;
File file = File(
    "$dir/" + DateTime.now().millisecondsSinceEpoch.toString() + ".pdf");
await file.writeAsBytes(bytes);
return file.path;
 }

Comments

[Boni Machado]

Here, you have a base64 string and create the file. But would you happen to know how to do the inverse, pal? I've an image file path and need to convert it to base64 in a flutter web app for submitting.

[biniyam112]

did you got the solution to this??

[Ahmad Khan]

@BoniMachado check this out stackoverflow.com/a/50038239/10482516