Clone this repo:
  1. ba92e34 Specify dependencies in the data property by jahinimtiaz · 13 days ago main master
  2. 7da4d93 Merge "Add data_device_bins_both to hidl_test_java" by Zi Wang · 2 weeks ago
  3. c36ee0c Parallelize singleton execution by LaMont Jones · 3 weeks ago
  4. 527c742 Add data_device_bins_both to hidl_test_java by Zi Wang · 4 weeks ago
  5. d6a3223 Fix a bug where min sdk version was not set correctly. by Yu Liu · 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).

NOTE: When using the -Landroidbp option, you can force generated modules to be installed in /system_ext rather than other partition by putting a marker file .hidl_for_system_ext alongside *.hal files.

NOTE: You can also install the vendor variant of the generated modules to be installed in /odm rather than /vendor by putting a marker file .hidl_for_odm alongside *.hal files.


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

m c2hal && c2hal -h