plugin to open a class in a tab of the IDE

Hello,

I am developing a plugin for Android Studio related to injecting code into the developer program code, so, when the user runs my plugin in the IDE, I want to provide him a window with all the classes of his project (not the classes of the plugin itself, but the classes of the program the developer is coding) and once he selects one, this one is opened in a tab of the IDE.

Do you know if there is a way to, through the plugin, get the classes of the project that the programmer is working in the IDE and how to select one to open it in a tab?

Any help or advice would be really appretiate it, I am getting crazy with this!!