The android commands for executing against a device will fail if no device is specified and there are multiple devices running. This situation occurs if you have multiple jobs running on a single node with multiple executors. The ANDROID_SERIAL environment variable can be used to tell the android toolkit which device to use - which is the same information found in ANDROID_AVD_DEVICE.

Build steps will not have to work around setting the device if the ANDROID_SERIAL is populated with the same information from ANDROID_AVD_DEVICE.