You just need to concentrate on two files for now: MainActivity.java and activity_main.xml. To make life just a little simpler, Android Studio normally opens both these files as soon as it boots up.

The Document Object Model (DOM) is the oldest, and arguably the easiest, method of working with generalized XML documents. Microsoft’s XML Core Services 4.0 (MSXML2) provides a competent DOM ...

Once here, look for the folder with the same name as the application. Get inside it and locate the XML file related to the task. It is usually with the same name, but if you want, open it with the ...