since this is valid solution as well, there is a prefferable way to do it differently :) Construct your command to execute with Command class like this:

https://github.com/arquillian/arquillian-droidium/blob/master/droidium-native/arquillian-droidium-native-impl/src/main/java/org/arquillian/droidium/native_/impl/DroidiumNativeArchiveDeployer.java#L138

and please get familiar with https://github.com/arquillian/arquillian-droidium/blob/master/droidium-container/arquillian-droidium-container-impl/src/main/java/org/arquillian/droidium/container/impl/ProcessExecutor.java

I see you used it previously, is this some special case when it can't be repeated?