title: Listen to volume changes events on Android
body: <p>Is there any way to listen to the event of volume change on Android, without just taking over the volume buttons?</p>
  
  <p>The only thing I've found that works is <a href="https://stackoverflow.com/questions/6896746/android-is-there-a-broadcast-action-for-volume-changes">here</a>, but it works only after the volume control has disappeared.</p>
  
  <p>Not all devices have volume buttons, and I need to capture the volume changes as soon as they occur, and not after the volume dialog is gone.</p>