title: Why Binder returns null when i bind Service in activity?
body: <p>There is a MainService , it has a data member binder  , and a function member  onBind() which return binder.<br/>
  In Mainactivity, it has a member binder too, and has a member  conn which class is ServiceConnection, and i override the onServiceConnected() function to asign value to binder.I bind service like this :
  bindservice(intent, conn, Service.BIND_AUTO_CREATE), i post this function in onCreate().However,  the result is that  binder is null.</p>