Nothing to say about this. Just follow the hints of android studio itself. I am really not good at the android studio things.
$ unzip android-ndk-r16b-linux-x86_64.zip -d /opt/
$ unzip sdk-tools-linux-3859397.zip -d /opt/android-sdk/
$ /opt/android-sdk/tools/bin/sdkmanager "build-tools;23.0.3" "build-tools;26.0.1" "platforms;android-23" "platform-tools"
- Modify the paths in the build.sh script.
- make a key for sign
$ keytool -genkeypair -validity 36500 -keystore mykey.keystore -keyalg RSA -keysize 2048
- run build.sh