In a vote of confidence for Google’s mobile operating system, mobile payments providers Boku and Zong are announcing today they will enable their services for Android mobile devices.

Boku and Zong are rivals in the emerging market for mobile payments, which are turning out to be popular ways to pay for apps on phones and social networks. With these services, you can pay for an app by entering your mobile phone number and then verifying your transaction. You can then immediately use the app, with the cost billed to your mobile phone. It’s easier than entering a 16-digit credit card number.

Zong is enabling its one-click mobile payment solution for Android and is opening a private beta test for developers to integrate its payment option into their apps. Boku is doing pretty much the same thing with what it calls a “one-tap” mobile payment service, a play on the “one-click” payments popularized on the Web by Amazon.com.