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| <p>The upcoming Android O release includes Project Treble, a major re-architect |
| of the Android OS framework designed to make it easier, faster, and less costly |
| for manufacturers to update devices to a new version of Android.</p> |
| |
| <h2 id=about-treble>Android updates</h2> |
| <p>Project Treble separates the vendor implementation (device-specific, |
| lower-level software written by silicon manufacturers) from the Android OS |
| framework via a new vendor interface.</p> |
| |
| <p>In Android 7.x and earlier, no formal vendor interface exists so device |
| makers must update large portions of the Android code to move a device to a |
| newer version of Android:</p> |
| |
| <img src="images/treble_blog_before.png"> |
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| <p class="img-caption"><strong>Figure 1.</strong> Pre-Treble Android update |
| environment</p> |
| |
| <p>With Treble, a new stable vendor interface provides access to the |
| hardware-specific parts of Android, enabling device makers to deliver new |
| Android releases simply by updating the Android OS framework—without any |
| additional work required from the silicon manufacturers:</p> |
| |
| <img src="images/treble_blog_after.png"> |
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| <p class="img-caption"><strong>Figure 2.</strong> Treble Android update |
| environment</p> |
| |
| <h2 id=testing-treble>Testing Treble</h2> |
| <p>To ensure forward compatibility of the vendor implementation, the new vendor |
| interface will be validated by the Vendor Test Suite (VTS), which is analogous |
| to the <a href="/compatibility/cts/">Compatibility Test Suite (CTS)</a>. VTS is |
| already launched and can be used to automate HAL and OS kernel testing even in |
| pre-Treble environments; for details, see |
| <a href="/devices/tech/test_infra/tradefed/fundamentals/vts">Systems Testing |
| With VTS</a>.</p> |
| |
| <h2 id=launching-treble>Coming soon</h2> |
| <p>Project Treble is coming to all new devices launching with Android O and |
| beyond, and the new architecture is already running on the Developer Preview of |
| O for Pixel phones. When Android O launches, we'll have full details here (on |
| <a href="https://source.android.com/">source.android.com</a>). In the interim, |
| you can find more details on Treble over at the |
| <a href="https://android-developers.googleblog.com/2017/05/here-comes-treble-modular-base-for.html">Android |
| Developers Blog</a>.</p> |
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