title: Android - Google Map v2 - need update google play service on device
body: <p>i use SDK 21 and i develop on google map v2 when i want install apk on device , device need latest version of google play service.   </p>
  
  <p>My questions are:   </p>
  
  <p>1 - have android devices google play service defaultly<br>
  2 - is it true to ask customer to install this service ?<br>
  3 - if two question is yes , how can i embed this service on my project that i just notify customer to service installation and my project install this service by itself</p>