We are not currently accepting new requests to be a part of the Android beta.
To get access to pre-release versions of Day One Android, you can follow these steps:
Enroll in the Day One Android Beta: https://play.google.com/apps/testing/com.dayoneapp.dayone
Update Day One Android in the Google Play Store: https://play.google.com/store/apps/details?id=com.dayoneapp.dayone
To leave the the Day One Android Beta, go back to this link and click "Leave the program": https://play.google.com/apps/testing/com.dayoneapp.dayone