MTJ has several runtime configurations, each configuration may require a different set of resources to be packaged on the application package.
The default behavior is to add all content within the source packages into the application package, although MTJ provides a Build Editor in order to edit build configurations.
On the build editor the user can setup all resources that will be on the application package. The editor
manages a build.properties file within the project's root folder.
There is also a source editor for the build configuration as shown bellow in case user wants to edit the file directly.