The logo was first used on Android 1.0 and was continued to be used on Android Jelly Bean and KitKat after the new wordmark was introduced and it is currently unused as of September-October 2014 when Google introduced the new logo with the new wordmark.
The new wordmark for Android has introduced at the Google I/O event on June 26, 2014, first used in Android 4.4.4 KitKat and debuted with Android Lollipop in October-November 2014. This logo and the 2017 logo continues to be used on Android Nougat, Oreo, and Pie after the new wordmark was introduced and it is currently unused as of August-September 2019 when Google introduced the new logo with the new wordmark.
This logo is used on the website as well as on the "Be Together. Not The Same." ad campaign. From 2017 this logo is used on "Powered by Android" boot-up screen.
This logo was introduced on August 27, 2019, along with the launch of Android 10.