Precondition

Install Android SDK.

Build

For Android 11, you should find getExportedNamespaceDiff in roadtosystem_jni.c and adjust a hardcoded delta.

# Set up `local.properties`
echo "sdk.dir=/path/to/android-sdk-linux" > local.properties

./gradlew build

Install

# Install on Android 8
./gradlew installArm8MinApi23Debug

# Install on Android 11
./gradlew installArm8MinApi30Debug

Test

Launch "roadtosystem" from application list of your device. You should see Access granted in a case of success.