![]() ![]() To get started building an Android accessory that uses a Bluetooth connection: Outputs to interface with your accessory. You can also provide a secondary AndroidĪpp that handles specialized communication such as data input or control Users must enable Bluetooth on their Android device and pair with yourĪccessory to use the accessory. AnĪccessory that uses Bluetooth to connect to Android devices must supportīluetooth communications and at least one of the supported connection profiles. Protocol (SSP) and Advanced Audio Distribution Profile (A2DP) profile. ![]() ![]() When planning to build an Android app that communicates with yourĪccessory via USB, review the ADK 2012 AndroidĪn accessory that connects with Android devices over a Bluetooth connectionĬan use connection profiles supported by Android, including the Simple Serial.General data communications and audio streaming. Which demonstrates an implementation of an accessory using a USB connection for Source code ( /adk2012/board/library/ADK2/), Understand how to implement this protocol on your accessory hardware. Select a hardware platform or build a hardware device that can support USB.To get started building an Android accessory that uses a USB connection: (rather than the adb or audio protocol), you must provide an AndroidĪpp that can detect the connection of your USB accessory and establish If you use the general accessory protocol to communicate with your accessory Human interface device (HID) capabilities. Supports generic accessory communication and adb Support the Android Open Accessory (AOA) protocol, which specifies how anĪccessory can establish communication with an Android device via USB.ĭue to the low power output of Android devices, AOA requires the accessory toĪct as a USB host, meaning the connecting accessory must power the bus.ĪOA has two versions that support different types of communication: Connecting over USBĪn accessory that connects to an Android device through a USB cable must Quick overview of your options for connecting your Android accessory andĪ list of resources to help you get started. All Android accessoriesĬonnect to an Android device in some way, so when building an accessory you mustĬonsider the type of connections your accessory will use. Lighting control, or anything else you can imagine. This is tested for a Linux installation with a Android x86 4.3 image.An accessory for Android can be anything: keyboard, thermometer, robot, Now, upon insertion of the USB device, your emulator should recognize a USB device. You will need read/write permissions for /dev/bus/usb/XXX/YYY, for that you can create a udev rule such as: SUBSYSTEM!="usb", GOTO="end_skip_usb"ĪTTRS="abcd", TAG+="uaccess" Or, when using QEMU: qemu-system-i386 -m 1G -cdrom android-x86.iso -usb -usbdevice host:1234:abcd To passthrough a USB device with of vendor ID 1234 and device ID abcd, you can run the emulator command: emulator -avd x86-machine -qemu -usb -usbdevice host:1234:abcd This also yields better performance by using the KVM extension on Linux. If you are not limited to ARM and can use x86, then I suggest to check out, its images can be used with a standard QEMU i386 (or x86_64) machine. The default emulator goldfish_armv7 kernel does not even have Host USB enabled.) (I have already tried enabling all USB host controllers for the goldfish_armv7 kernel based on Linux 3.4, without luck. It does not seem to be available for ARM devices though, the emulated ARM machine does not have a USB controller. Even if the emulator version is so ancient, there appears to be support for passing USB devices from the host. ![]()
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