android - Call method(ProjectActivity) from another Library Activity -

i want call 1 method library method written in activity of project how can achieve this:

activity.java (myproject):

public class databasehelper extends sqliteopenhelper {     public void favorite(string str[], context cxt) {     } }

library activity(modules(libraryfile))

public class mupdfactivity extends activity{    //here want call( favorite(string str[], context cxt)) method. }

please me issue.

M16