The library file is the third-party code that the application depends, which are the correct...

Create a new module with the source code of the library file as a whole, and the entry directly references the classes in the library file

Put the library files in the libs directory in the form of jar, so, etc., and then reference the dependencies{Implementation project(:mylibrary)} through the build.gradle under the project

If the required library files exist in the maven repository, you can configure the project's build.gradle as follows to useRepositories {.}

Maven{

Url 'XXX'

// Add a Mavenrepository address, which can be a local Maven address or a remote Maven address

}

Put the library file in the libs directory in the form of jar.so, and then refer to the dependencies (Implementationproject(: mylibrary)) through the build.gradle of the application module.