Constant LIBRARY_CRATES 

const LIBRARY_CRATES: &[&str];

The crates that build the libraries the activities load, in the order the tab bar lists them. Each is a cdylib exporting android_main, and each activity names the one it loads in its android.app.lib_name manifest entry — the package is the example’s name with _android appended, while the library keeps the example’s own name.