Clone this repo:
  1. 0d56ffa Merge "Implementing Discriminated Unions in HIDL" by Treehugger Robot · 4 days ago master
  2. 0ab8265 Implementing Discriminated Unions in HIDL by Nirav Atre · 2 weeks ago
  3. f2a9396 Allow hidl to be used in recovery by Jerry Zhang · 3 weeks ago
  4. 0470194 Merge "Change the implementation to generate vts files" by Zhuoyao Zhang · 6 days ago
  5. 89463bd Explicit destructor invocation for HIDL types by Nirav Atre · 7 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