Android Application :
Code + Data = Application|
(Business Logic + Presentation Logic) + Data
Business Logic - Java -
Project/src/package/ .java files
Presentation Logic - XML -
Project/layout/ .xml files
Data - XML
Project/values/ .xml files
class Activity
{
// 80% code
}
class MyActivity extends Activity
{
// you have to execute 80% code present in super class - super.method(data);
// 20% code
}