Consumers will be making payments with a tap of their wristwatch as Google Inc. launches its Android Wear platform for wearable devices.

Google demonstrated how smartwatches made by LG, Samsung and Motorola, will support payments by syncing to an app on a user's smartphone.

The company demonstrated how the Eat24 mobile app can automatically install a widget on the user's smartwatch and suggest to order a pizza at a time determined by the user's past orders.

After pulling up the user's last order on the smartwatch, it takes "just one more tap to pay, and the pizza's on its way," said David Singleton, a Google Android engineering director, during the keynote presentation at Google's I/O conference June 25. "I think that clocked in under 20 seconds" from the moment the notification appeared, he said.

In a separate demonstration of the smartwatch's capabilities, Singleton briefly showed a QR code representing a boarding pass for an airline. Many mobile wallets use QR codes or other types of bar codes to display payment data.  The Pebble, a non-Android smartwatch, already does this to enable payments through LevelUp's app.

Google is also expanding direct carrier billing to tablets. The feature, already supported on smartphones, allows users to make purchases of digital content on the Google Play store to the user's mobile phone bill.

Google also showed off Android TV, a smart TV platform it plans to launch soon.

The Android TV will operate in the same manner as Android phones, tablets and wearable devices, allowing a consumer access to all of his applications in addition to services specific to the TV, said Dave Burke, an Android engineering director.

As such, consumers would be able to access an Android mobile app through their TV to order a pizza and make other purchases.

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