Google on Monday released an updated version of the Android software development kit as well as a timeline for future releases.

In addition to fixing “tons of bugs,” the update includes a “ton” of user interface changes, according to a blog post written by Dan Morrill, developer advocate at Google. It also includes new applications such as an alarm clock, calculator, camera, music player, picture viewer and messaging application.

Since Google first issued a preliminary SDK last November, it has worked closely with companies that are members of the Android Open Handset Alliance to further develop the Linux-based operating system, Morrill wrote. Now the companies are close to completing the first version of Android, which will be loaded onto devices shipping in the fourth quarter, he wrote.

Google also laid out a general timeline for future releases. In September, it could release additional SDK updates if necessary, and it expects to launch the final Android 1.0 software and SDK in either the third or fourth quarter. Also in the fourth quarter, Google plans to release the source code.

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