Prerequisites
Depending on what platforms and adapters you use, there are several prerequisites to install before getting started.
- General
 - Circom
 - iOS
 - Android
- Android Studio
 - Also see configuration below
 
 
Android configuration
Some additional configuration is required for Android.
First, install the latest SDK. In Android Studio, go to SDK Manager > SDK Tools and install NDK (Side by Side) (see Android Developer site).
After that, set the following environment variables:
- Export 
$ANDROID_HOMEand change{USER_NAME}to your username 
export ANDROID_HOME="/Users/{USER_NAME}/Library/Android/sdk"
- Locate which NDK version you have
 
ls $ANDROID_HOME/ndk # => 26.1.10909125
- Set it to your 
NDK_PATHenvironment variable 
NDK_PATH=$ANDROID_HOME/ndk/26.1.10909125
Reference: Running Rust on Android with UniFFI.