Android plugin dependency

You should check out the documentation on building & using Android plugins.

When it comes to Android plugins, you have a few choices:

1. JAR files - a compressed file with compiled Java classes (e.g: code)

2. AAR files - Android archive, also a compressed file that contains code as well as other resources

3. Android library projects - A folder structure, the same as the one used to create an .AAR file, but still in its original form (not compiled into an .aar). All source files should be pre-compiled under bin/ or libs/ folder as far as i remember.

Regarding your specific scenario - you say that you compiled your code into a .JAR, but these files do not contain any resources. If you have your own layouts, or specific values, images, etc under the res/ folder, these will not be added to the .JAR file.

What you can do is compile your entire library to an .AAR file. This will contain everything under res/ , all the libraries, etc. Then add this file to your Android project (under Assets/Plugins/Android). This should be automatically identified by Unity as an Android plugin. When building your project it will add this library to the final game package.