title: Android Pull Down To Reveal View From Top of Activity
body: <p>I have an activity and when user swipe from top to bottom, a view at the top of activity, will go down as how much distance the user swipes. There is similar topics about this issue but they are not exactly what i want. How can i do that. </p>
  
  <p>At the begining the view is outside of Activity. When user start to pull. It will go down at the top of activity and whole view will go down as a portion of slide.</p>