Products AOSP Reference API Reference developer_board Hardware Abstraction Layer Android gives you the freedom to implement your own device specifications and drivers. The hardware abstraction layer (HAL) provides a standard method for creating software hooks between the Android platform stack and your hardware. developer_mode Trade Federation A continuous test framework designed for running tests on Android devices. It's a Java application which runs on a host computer, and communicates to one or more Android devices using ddmlib over adb. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates.