Carriers are activating more than 300,000 Android devices every day, a Google executive confirmed Wednesday.

Andy Rubin, vice president of engineering at Google, took to his Twitter account for the second time this week to make that announcement. "There are over 300,000 Android phones activated each day," he tweeted.

That comes about two months after Google chief executive Eric Schmidt said that Google was activating 200,000 Android devices per day.

Earlier this week, Rubin was at the D: Get Into Mobile conference in San Francisco to show off an Android "Honeycomb" tablet for the first time. The 10-inch Motorola device included a revamped Android interface, though few other details were announced. Honeycomb should release sometime next year.

Rubin also showed off the new Google Nexus S smartphone, which he said is a "pure Android, pure Google phone." Possibly helping those activation numbers is the fact that Google will not try to sell the new device by itself, as it did with the troubled Nexus One. Rubin admitted that Google "bit off more than it could chew" by having its own mobile store for the Nexus One.

At the same conference, Rubin insisted that Android is a profitable undertaking for Google. Advertising on Android-based phones is a revenue stream for the search giant and, in fact, makes the Android enterprise within Google profitable all by itself, he said.

Android has been gaining steam in the mobile OS battle. November data from comScore found that Android nabbed 14.9 percent of the global market in October, a 6.5 percent increase. In the U.S., two separate studies found that Android captured 44 percent of the smartphone market in the third quarter ahead of Apple and Research in Motion.

Rubin's tweet, meanwhile, is only his second. The Google exec previously tweeted in October, to shoot down claims by Apple CEO Steve Jobs that Android is closed.