Right Credentials In Requestbody For Android Google Play Oauth2 Gtalk Authtoken

Running the code below I get 'error' : 'unauthorized_client'. Need help pinpoint what I have done wrong. I Want to use this in an Android app to enable Google Talk (xmpp is there

Solution 1:

I think you should have registered your application with type 'Android'. Then you will be asked to provide information (such as package name and certificate) that will allow the Android platform to recognize your application.