title: Notification vibrating when screen is on even when I'm on the phone
body: <p>I have an app that starts a notification at a certain time, the user can choose the ringtone of the notification, when I put my phone on mute mode and the screen was off the notification didn't vibrate but when the screen was on it vibrated even when I had a phone call, when I changed the phone mode to sound and had a phone call the notification didn't make a sound but vibrated although I'm having a phone call how to fix that? 
  What I mean is: is this a normal thing because it's normal I think that I have to check for the phone state and if it was ringing I have to change the notification's vibration to off... because it's my first app and need to know what should I have to do for a notification to not cause any troubles...
  thanks.</p>