Google has unveiled the developer preview version of its next Android version, Android M, adding a new mobile payments service and enhanced privacy controls.

Android M was unveiled at Google I/O 2015 by the firm's vice president of engineering Dave Burke, who claimed the update is designed to "fix core issues" with the software.

"We made a decision to focus on quality. The central theme of M is improving Android's core user experience, squashing 1000s of bugs to solving problems that have plagued the platform for years," he said.