This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A : Introduction to Lesson 2 After we went through the first part of lesson 1, knows the basis of the android layouts and XML code. In the lesson 2, we keep adding some new element into our app. We will divide the course into two parts which are all about interacting with user in this lesson. First part ---- Lesson 2A build up some buttons in XML code. Second part ---- Lesson 2B how to let the button do some action with our users. >> 下一篇