Flutter plugin for getting a persistent UDID accross reinstalls on iOS and Android.
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README.md

flutter_udid

pub package

Plugin for getting a persistent UDID across app reinstalls on iOS and Android.

Getting Started

import 'package:flutter_udid/flutter_udid.dart';
String udid = await FlutterUdid.udid;

This provides an UDID for both iOS and Android using the format of the corresponding platform.

Platform Format
iOS 7946DA4E-8429-423C-B405-B3FC77914E3E
Android 8af8770a27cfd182

To get a consistent formatting on both platforms use:

import 'package:flutter_udid/flutter_udid.dart';
String udid = await FlutterUdid.consistentUdid;

This will result in an UDID of the following format:
984725b6c4f55963cc52fca0f943f9a8060b1c71900d542c79669b6dc718a64b

The UDID can change after a factory reset! Additionally if a device has been updated to Android 8.0 through an OTA and the app is reinstalled the UDID may change as well due to security changes in Android 8.0. On rooted and jailbroken devices the ID can be changed, so make to take this into account. However it should not be possible to identify as another already existing user through random guessing because of the complexity of the ID.

For help getting started with Flutter, view the online documentation.

For help on editing plugin code, view the documentation.