Build libusb/hidapi for Android

build-hidapi-android.sh

#!/bin/bash
# Run this in a directory where you don't mind cloning a few git repositories. e.g. /tmp
if [[ -f ${AndroidNdkDirectory}/ndk-build ]]
then
  git clone git@github.com:libusb/libusb.git
  git clone git@github.com:libusb/hidapi.git
  cd hidapi/android/jni
  # Apply patch from my gist to point Android.mk to correct libusb directory.
  curl https://gist.githubusercontent.com/Ghostbird/2485d23afc39fbdac3bda136a46e6577/raw/a0fcbfd4c49b7f78b5faeb4befe3e47d33e93d87/Android.mk.patch | git apply -
  # Print the file and ask for the user to confirm that the patch was not ransomware
  echo --- Android.mk ---
  cat Android.mk
  echo --- END OF FILE ---
  echo If you\'re sure that Android.mk is still safe to run, press ENTER.
  read -p "Otherwise, press Ctrl+C to abort" && ${AndroidNdkDirectory}/ndk-build
else
  echo Please export "AndroidNdkDirectory" to point to the directory where your ndk-build binary is located. Then re-run this script.
fi

After running this script, the libraries are in ../libs/ relative to your working directory.