I'm trying to integrate google+ sign-in in my android app. I want to ask that does it required to have google+ app installed on the host phone for someone to sign in my app through their google+ account ?
The answer is NO. Google+ app isn't needed at all. Only the latest google play services library is needed for the app to run on a device. And mostly this library is available on most phones.
Yes as per the latest docs:
reference: https://developers.google.com/+/mobile/android/getting-started
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