Send preinstalled app activity

You can use the Adjust SDK to record activity from apps that came preinstalled on a user’s device. This enables you to send information from users who didn’t download your app from a campaign.

Configuring a default link token enables you to attribute all preinstalls to a predefined Adjust link. Adjust records all information against this token until the attribution source changes. To set this up:

Create a new campaign link in Campaign Lab.
```
https://app.adjust.com/{token}
```
Copy this token and assign it to the defaultTracker property of your config object.

Build and run your app. If you have logging enabled, you should see a message in your log
```
Default tracker: 'abc123'.
```