Clone this repo:
  1. 77edae1 Fix clang-tidy performance-faster-string-find warnings by Chih-Hung Hsieh · 6 days ago master
  2. 5d0b2e3 Mark drm hidl_interfaces double_loadable by Robert Shih · 11 days ago
  3. 7c7a24c libhidlmetadata: fail on failure by Steven Moreland · 12 days ago
  4. 878f609 Merge "hidl_interface: enable HAL fuzzers by default" by Tri Vo · 3 weeks ago
  5. 277c270 Add 'while importing X at Y' error chains. by Steven Moreland · 4 weeks ago


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