Google Plus For Android Bad Access Token

I been following Getting started and sign in to get access_token of user. I do get an access token but when using it i am getting this error: { 'error': { 'errors': [ { '

Solution 1:

These tokens have a 1 hour expiration period.

Solution 2:

Ping the server with some query every time you start the app and before starting your functions,this would refresh the token.