[android-developers] caching TelephonyManager and other managers

I user a bunch of managers in my app, like TelephonyManager,
ConnectivityManager, LocationManager and a few more. I initialise
these in my onCreate() of my service and use them later on.
I'm wondering if this is the correct approach. Should I be
initializing each manager as I need it, or is it ok to initialise them
once at the creation of my service for later use?
Thanks for your help.

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