title: How much would a swipe down/up move a normal vertical RecyclerView/list?
body: <p>Suppose I use this command:</p>
  
  <pre><code>adb shell input touchscreen swipe x1 y1 x1 y2 50 
  </code></pre>
  
  <p>How can I know how much pixels will it really scroll? </p>
  
  <p>Is there any way to calculate it? </p>