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  1. 5a7a046 Merge "hidl_package_root: use ExistentPathForSource" by Treehugger Robot · 87 minutes ago master
  2. 9ae68ab hidl_package_root: use ExistentPathForSource by Steven Moreland · 6 days ago
  3. 55df071 Add function count. by Steven Moreland · 6 days ago
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  5. 005757b performance-unnecessary-value-param where possible by Steven Moreland · 4 weeks ago oreo-mr1-iot-release android-o-mr1-iot-release-1.0.8


Full documentation can be found here:

hidl-gen is a compiler for the HIDL (HAL Interface Design Language) which generates C++ and Java endpoints for RPC mechanisms. The main userspace libraries which this compiler uses can be found at system/libhidl.

1. Build

m hidl-gen

2. Run

Note that options for hidl-gen expected to be invoked by the build system are marked with ‘internal’ in the help menu.

hidl-gen -h

hidl-gen -o output -L c++-impl -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport android.hardware.nfc@1.0

Some defaults for package roots are also provided

hidl-gen -o output -L c++-impl android.hardware.nfc@1.0
hidl-gen -o output -L vts android.hardware.nfc@1.0
hidl-gen -L hash android.hardware.nfc@1.0

Example command for vendor project

hidl-gen -L c++-impl -r

See and for examples of how to generate HIDL makefiles (using the -Landroidbp option).


This is a helper tool to convert C headers to valid .hal files.

m c2hal && c2hal -h


This tool generates html documentation for hal interfaces.

m hidl-doc && hidl-doc -h