requests from android to Yii

I’ve an android app from which users can signin and signup but when the user wants to perform an action which needs to be authenticated the Yii doesn’t know this user has been authenticated before.

for example I sign in from my android app just fine but when I want to edit a post(the user must be signed in) the Yii doesn’t have any clue that this user has just signed in.

So I guess I should send some information(maybe some token or header information) along with other information to Yii so that Yii know this user has signed in and the session hasn’t expired yet.

my question is what is that magical information??

please help.

I believe you can do normal php session with cookie driver