title: Android back key/button, how to use perfectly?
body: <p>I'm developing an app which downloads stuff from the internet and displays, more like web browser. The more deep you go in, the back key stack fills up. So now when you press back key, it loads last URL from the list and then keep goes till the first visited URL and on the last time, back key is pressed, the app closes.</p>
  
  <p>But there is a problem, assume you are browsing for a long time with so many URLs in back-key list. Now you want to close the app but you will have to keep press back key till the last URL and then it will get close. It's not a good idea, I mean its very annoying. If I want to close the app it must be done in a single tap. So I came up with an idea to put an exit button but it still a bad design for android. </p>
  
  <p>I'm wondering if there is any better way you guys can suggest, that would be very nice.</p>