title: Android Code for change activity when swipe left/right
body: <p>i am very new in the world of programming.And also my English is very weak. But i want to know the code for this. I created a project for Math (AP,GP,HP) series. Now i want to set-up this like Whatsapp have Calls,Chats,Contacts.What should i do? Also Whatsapp has a white line under Calls/Chats/Contacts.that code for it?</p>