android - Is Google Account required for GCM (Google Cloud Messaging)? -

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i need write simple app push notifications.
used gcm uses google play services information.

my questions - access gcm, google account required or not?
can use email account identify device?
there other way push notification email account or device?

quoting gcm characteristics

it uses existing connection google services. pre-3.0 devices, requires users set google account on mobile devices. google account not requirement on devices running android 4.0.4 or higher.

if app supporting pre-3.0 devices, yes, google account required , need add permission manifest

<uses-permission android:name="android.permission.get_accounts" />

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