Get the justtrack user ID
Each user is assigned a unique user ID by the justtrack SDK which you can access inside your app. You can use this ID to recognize returning users in your app again. Should you already assign a unique ID to your users, you can also link your ID to the justtrack user ID.
The justtrack SDK provides you with a unique ID for each user. You can retrieve a AsyncFuture
resolving to this ID by using the getUserId
method on the justtrack SDK:
To wait for the returned AsyncFuture
to resolve to a value, you need to call get
on it. This will block the current thread until the future resolves or throws an exception.
You can not call get
on the main (UI) thread! This is a safeguard for you as a AsyncFuture
you get back from the SDK might actually depend on work the main/UI thread is expected to do. Blocking that thread could then deadlock your app. If you call get
on the main thread, an exception will be thrown. You can either call the method on another thread or use registerPromiseCallback
to schedule a callback when the future resolves:
If you are using Kotlin coroutines, you can use await
instead to suspend your current coroutine until the AsyncFuture
resolves to a result like this:
If the attribution can not be performed because the user is offline, it will eventually fail. The SDK will then wait for a new internet connection and retry the attribution. An attribution obtained after the returned AsyncFuture
resolved to a failure value will not update the future. You have to subscribe to updates of the attribution using registerAttributionListener()
to receive the attribution.
Provide your own User Id
If you already have a mechanism to assign a unique id to each user, you can share this information with the justtrack SDK. This then allows the backend of the justtrack SDK to associate events received from third parties via that user id with the correct user on justtrack side. You can provide as an id multiple times, the justtrack SDK takes care about sending it to the justtrack backend as needed.
You can supply the own user id when constructing the SDK as well as sending it later once your app is already running for some time. Should your own user id change for some reason, you have to supply the new value to the justtrack SDK again:
A custom user id must be shorter than 4096 characters and only consist of printable ASCII characters (U+0020 to U+007E).
Last updated