Note that the ARM to x86 translation technology enables the execution of intellectual property owned by Arm Limited. Given that this is a new technology, please let us know of any problems via our Issue Tracker. Going forward, we plan to roll this technology out across a wider variety of API levels and ensure that it supports testing all use cases that a physical device would. That said, we still recommend that developers publish both x86 and ARM ABI variants of their apps to achieve the best physical device performance and reach as many users as possible.
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This technology should enable more developers to test with the Android Emulator. Building for Chrome OS provides access to a substantial ecosystem of larger screen devices, allowing your application to reach even more users globally. Chrome OS also supports the execution of Android apps built for ARM on x86 laptops. Once you get your app running on the emulator, consider adapting it for Chrome OS. Using the Android Virtual Device Manager to create an AVD that runs Android 11 These system images can be downloaded in Android Studio via either the SDK Manager or the Android Virtual Device Manager. If you have previously chosen physical devices over the emulator due to the lack of performant ARM support, try out the Android 11 system images, which are now available alongside the Android 11 Developer Preview. This is possible thanks to collaboration with ARM Limited. These new emulator system images can be used both locally and on your own continuous integration infrastructure. In addition to this, the translator avoids expensive memory access instrumentation and the associated performance hit by avoiding the execution of low-level hardware-specific libraries. This allows the rest of the process to continue executing in x86, including the Android Runtime (ART), and other performance-critical libraries like libGLES and libvulkan. When an app’s process requires an ARM binary, the binary is translated to x86 within that process exclusively. The new ARM-compatible Android 11 system images allow the entire system to run x86 natively and take advantage of virtualization technologies as usual.
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Additionally, emulator system images with full ARM emulation cannot take advantage of the hardware acceleration and CPU virtualization technologies provided by x86 processors. Due to the overhead of translating an entire system’s worth of ARM instructions to x86, emulator system images with full ARM emulation tend to run much slower than x86-based system images when run on x86 host machines.
Previously, if you wanted to get around this limitation and execute an app built for ARM on your x86 machine, you would have had to use an emulator system image with full ARM emulation.
This is a problem if you develop on a computer with an x86-based processor, as it would prevent you from running your app. Mobile phones tend to have ARM processors consequently, many C++ dependencies you might add to your app, like a camera barcode scanner library, are only compatible with ARM processors.
This means that it needs to be compiled differently based on the architecture of the target device. Unlike Kotlin or the Java programming language, both of which execute on the Android Runtime (ART), any C++ in your Android app compiles directly into machine instructions. The significance of this may require a bit of context, especially if you build apps exclusively with Kotlin or the Java programming language. The new Android 11 (Google APIs) x86 system image supports ARM ABIs, while the older Android Oreo system image does not Details This allows the execution of ARM binaries for testing without the performance overhead of full ARM emulation. The new Android 11 system images are capable of translating ARM instructions to x86 without impacting the entire system. Previously, developers who were dependent on ARM libraries and could not build an x86 variant of their app either had to use system images with full ARM emulation, which are much slower than x86 system images when run on x86-based computers, or resort to physical devices. As part of the Android 11 developer preview we’ve released Android 11 system images, which are capable of executing ARM binaries with significantly improved performance.
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