Configuring data storage

Hello everyone, I encountered such a problem, created an application, added a web view there, with a specific link to the site, the site has a personal account, it is fashionable to log in, but if you close the application and enter it again, the authorization disappears on the site, tell me how to do what would the application not flush the webview cache?

You clear cookies and cache ?
I do some test with facebook and if i clear the cookies user need login again when open the app for second time

no, I do not clear the cache, the application resets it itself