This page provides release notes for each version of the Play Install Referrer API Library.

## Play Install Referrer API Library 2.2 Release (2021-01-14)

Version 2.2 launched. Fixed an issue where apps could crash caused by a`SecurityException`(see[Issue #72926755)](https://issuetracker.google.com/issues/72926755)).

Added a new`InstallReferrerResponse`constant:`PERMISSION_ERROR`, which is returned whenever the app is not allowed to bind to the Service.

## Play Install Referrer API Library 2.1 Release (2020-07-08)

Version 2.1 launched. Fixed an issue where apps could crash with a`NoClassDefFoundError`error when the[`InstallReferrerClient.startConnection()`](https://developer.android.com/reference/com/android/installreferrer/api/InstallReferrerClient#startconnection)method was called (see[Issue #145557612](https://issuetracker.google.com/issues/145557612)).

## Play Install Referrer API Library 2.0 Release (2020-07-06)

Version 2.0 launched. Added new fields to the response of the[`getInstallReferrer()`](https://developer.android.com/google/play/installreferrer/igetinstallreferrerservice#the_getinstallreferrer_method)method to help developers understand and discover information about fraudulent clicks.

## Play Install Referrer API Library 1.1 Release (2019-11-22)

Version 1.1 launched. Added the[`getGooglePlayInstantParam()`](https://developer.android.com/reference/com/android/installreferrer/api/ReferrerDetails#getgoogleplayinstantparam)method, which checks whether the user has interacted with your app's[instant experience](https://developer.android.com/topic/google-play-instant/overview)within the past 7 days.

## Play Install Referrer API Library 1.0 Release (2017-11-15)

Version 1.0 launched. The initial version focuses on a library that wraps the Android Interface Definition Language (AIDL) API. For more information about the AIDL interface, refer to the[Play Install Referrer API](https://developer.android.com/google/play/installreferrer/igetinstallreferrerservice)page.