title: Can I hang up a call programmatically in android?
body: <p>I hope to block some crank call, so I need to hang up some call programmatically in android.</p>
  
  <p>The following fragment is from <a href="https://stackoverflow.com/questions/599443/how-to-hang-up-outgoing-call-in-android">How to hang up outgoing call in Android?</a><br>
  Does it mean the technique of hang up call will be block at any time in further Android version?<br>
  Does it mean I can't write an app to hang up a call?</p>
  
  <p><em>The only way to hang up that I've encountered so far, is to do so through Java Reflection. As it is not part of the public API, you should be careful to use it, and not rely upon it. Any change to the internal composition of Android will effectively break your application.</em></p>