Clone this repo:
  1. 0023be9 Merge changes from topic "b117561179" by Treehugger Robot · 9 days ago master android-o-mr1-iot-release-smart-display-r4
  2. 35835f1 More verbose error for safe_union invalid access. by Steven Moreland · 13 days ago
  3. d2549c5 Merge "hidl_package_root: don't expose Full_root_path" by Treehugger Robot · 9 days ago
  4. ae64970 Merge "hidl_test: cpp-specific safe_union" by Treehugger Robot · 13 days ago
  5. 136abb8 hidl_package_root: don't expose Full_root_path by Steven Moreland · 13 days 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


This tool generates html documentation for hal interfaces.

m hidl-doc && hidl-doc -h