This Might be help some:
To import module as library in your project.
- File > New > Import Module
- Select Valid path in Source Dir..
- Tick on Import > Finish
Now Open Module setting:
- Go to File > Project Structure > Modules
- Modules > Dependency > click on Green Plus Sign.
- Click on Module Dependency > locate module > and Implement your module.
if your module is not shown in "Choose Modules Window"
Follow the below step..
- Open Settings.Gradle file
- include ':app', 'Put your module name here' and sync project.
Follow Open Module Setting as above.