Checking for installation path stopped working when Google started shipping devices with hangouts installed into the ROM part. I guess the original Nexus 5 ROM includes the new hangouts app in the ROM. Further updates will be installed in user space.
I'm not sure with the first part checking for com.google.android.apps.babel package.
The decoded AndroidManifest.xml of my N4's hangouts app shows a packageName="com.google.android.apps.babel". But the PackageManager throws a NameNotFoundException.
Maybe you can just drop that first part completely.
Since Gtalk will not be upgraded even more, you can relay in this method to identify it, another approach could be always send your user to the market if their hangouts app isn't the last one (or a few versions).
Out from the box, when adding person to Google contacts, you don't really add him or her to your Hangouts contact list (I have 500+ at-gmail-contacts in my google contacts, but only 10-20 of them are in hangouts contacts). But when you start hangouts chat with this person (from Gmail web-page, or from Android Hangouts app, etc.), person's contact get added to hangouts contacts.
Then, you could use hangouts via "classical" XMPP, using your favourite client app (I use Kopete). When connecting to Google via XMPP with your Gmail login and password, your Jabber client get contact list, which is the same as your Hangouts contact list. So, it contains every person you ever chat via Hangouts.
Isaacson, K. (2013, June). An investigation into the affordances of google hangouts for possible use in synchronous online learning environments. In World Conference on Educational Multimedia, Hypermedia and Telecommunications (No. 1).
Now that you have two separate Chrome windows opened, you can sign into a different Google account in each window and then install the Hangouts extension in each window (under your two different Google accounts). Then from each Chrome window you can launch the hangouts extension and it will be for each respectively logged in Google account (from the account that was logged into Chrome).
Skype for Business is a popular video meeting tool when in-person conferences are not possible. Available for both desktop and mobile use, Skype for Business allows several people to record the video call. Recording a Skype video call is basically the same whether you are using your computer, iPhone, or android.
Google Hangouts was announced in 2013, spinning out of Google+. It was integrated into Gmail and other Google applications as a communication tool, joined by Google Hangouts Meet and Hangouts Chat, for Workspace customers, which now run without the Hangouts in the name, although personal Google account users will still see Hangouts in Gmail. The service can be accessed at hangouts.google.com.
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