[keycloak-user] Keycloak login/logout on Android

Hello. I'm trying to login and logout to KeyCloak through an Android application. So far I was able to login using AeroGear Authz. What happens is that a web view is created every time login is required. However I don't understand how logout works. In the documentation it states that you should point to 'auth/realms/.../logout'. How does it figure out which client am I? Through a session or maybe cookies? The other question is how would customer-portal and product-portal be implemented in android, theoretically?