[keycloak-dev] Keycloak - Ionic 2 & Cordova - Persist login information

I'm building app with Ionic 2 & Cordova and using Keycloak for login/signup. My problem is when exit the application without logging out, and open the application again, the keycloak sends me to the login page again. i'll trying add "offline_access" to scope options but get the error 'Access-Control-Allow-Origin' XMLHttpRequest cannot load https://my-keycloak-server/auth/realms/app/protocol/openid-connect/token. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8100' is therefore not allowed access. The response had HTTP status code 400. My implementation is based on https://github.com/keycloak/keycloak/tree/master/examples/demo-template/a... I'm doing something wrong? Another suggestion for this implementation?