Over the years, the mobile devices landscape has grown to hundreds of OEMs and tens of thousands of device models. This landscape has made it difficult to develop quality mobile applications that are user-friendly, stable, and performant. To accelerate mobile development and to help developers build better performing, more stable apps, Google built a large Mobile Device Farm that allows developers to test their mobile applications. In this document we share lessons learned while building the Mobile Device Farm, including pitfalls and successes, to help the mobile development community leverage our experience and build better mobile apps. While we describe both Android and iOS, we primarily focus on the Android Open Source Project (AOSP) because it is highly diverse and dynamic. We've scaled from 10s of devices to 10s of thousands, and from hundreds of tests a day to millions.
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