The Android emulator also emulates GSM support, a GPS chip, sensors (proximity and rotation), and more to provide application developers with an experience close to a real phone and to allow developers to test all aspects of their applications, such as how an application responds to a user rotating a device or an application requesting the current location. This is used by both the adb service to communicate with the guest adb daemon and console services and to provide a fast passthrough path for the emulated accelerated graphics support described above. The emulated devices include a fast IPC mechanism known as the “qemu_pipe” that provides a way for the emulated Android userspace to communicate with the host machine. Emulating GPU hardware is certainly not something you want (or could!) emulate directly, because GPUs are complicated proprietary pieces of hardware with strict performance requirements. The Android emulator provides accelerated graphics support in the emulated guest Android operating system, by providing an OpenGL passthrough mechanism that allows the emulated Android system to make OpenGL calls that are directly rendered by the host accelerated graphics stack to the emulated window without having to emulate a GPU inside QEMU itself. Accelerated graphics is a key component in modern mobile systems and a crucial for a reasonable application performance experience. The other big user interface component is accelerated graphics support. The UI patches support skinning of the framebuffer window so a mock up of the emulated devices’ keypad/buttons can be displayed alongside the screen. There are a number of differences to mainline QEMU that fall broadly into the two categories: User Interface and Emulated Devices. With the introduction of the Armv8-A architecture and Android support for 64-bit Arm platforms, this need is more important than ever because it allows developers to begin adapting their applications to an Arm 64-bit based mobile ecosystem prior to hardware being available. The Android emulator provides Android application developers with a convenient development environment and allows developers to develop and test applications on devices which they do not have physical access to. These features allow a smooth and complete user experience resembling using a real Android device, on laptop and desktop workstations. A number of specific emulator features are enabled in both the Android kernel and Android userspace environment when run in an emulated environment.
Specifically, they added emulation of a specific board called goldfish for the purposes of emulating an Android phone.Įvery build of Android targets a specific hardware platform, and the emulated goldfish platform is no different.
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They copied the source code to a custom repository in the Android Open Source Project (AOSP) and made a number of invasive modifications to QEMU.
When the Android SDK was first made available to the world, Google used QEMU as the basis for their Android emulator. Running Android L Developer Preview on 64-bit Arm QEMUĭid you know the Android emulator is based on QEMU?
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