title: android:draw line on your device and show it to another device though wifi with no delay
body: <p>My goal is to develop an android app that can share screen with another device with no delay.</p>
  
  <p>If I draw an line on my device, I hope another device get the same line.</p>
  
  <p>I just need some suggest.
  I have some questions.</p>
  
  <ol>
  <li>dose the android api support these feature?(drawing line on anther device.)</li>
  <li>if it dose, which package can do the trick.</li>
  <li>if it dose not , it seems that I need to write my own api, isn't it?</li>
  </ol>
  
  <p>thanks,
  charlie.</p>