Rubin was a speaker at the Japan New Economy Summit held Tuesday in Tokyo. The summit was backed by a Japanese business group that aims to kick-start the country's economy.
In March, Google announced that Rubin had stepped down from his role leading Android in order to "start a new chapter" at the company.
Rubin said Tuesday he would continue to create products directed at end users.
"I can pretty much guarantee you that whatever I do next it's going to be something that delights consumers."