Session Cookies in WebView - AzureAD/azure-activedirectory-library-for-android GitHub Wiki

Android webview does not clear session cookies after app is closed. You can handle this with sample code below:

CookieSyncManager.createInstance(getApplicationContext());
CookieManager cookieManager = CookieManager.getInstance();
cookieManager.removeSessionCookie();
CookieSyncManager.getInstance().sync();

More about cookies here: CookieSyncManager