single sign on - Android pass credentials to other app -

currently searching possible ways of passing credentials other application without specifying uri. let me describe flow:

1. user opens application , login view displayed
2. user enters his/her credentials form (e.g. email / password)
3. my application finds desired app (lets assume facebook), finds com.facebook.katana package , prepares intent it.
4. here comes answer question: how pass credentials?
5. or put credentials intent specific intent action
6. facebook app opened , users credentials passed facebook login form , user authenticated.

please, not provide answers related sdk usages (e.g. "use facebook sdk authenticate facebook). need generic solution authenticating applications selected user provided credentials user.

let me know if possible , how achieve without changes on partners app handle specific uri. thanks!