Android应用：从安全位置接收数据

I am new to app development on android, and I was wondering if it is possible to retrieve information from any secured website, of course by sending a correct username and password. The user would enter his user name and password in the app, and the app would enter the website, log in automatically, retrieve data from a page, showing it in the app (all of this behind the scenes). This is a general question, and it would be very helpful to know where to begin and what is needed in general for this.I am new to app development on android, and I w