Function to remove the entries in the ADAL token cache, delete the cookies and set the relevant objects to null.This allows the app to disconnect from Office 365 and then connect with a different user.

Disconnect.java

private void disconnect(){
    //Clear tokens.
    AuthenticationManager
            .getInstance()
            .getAuthenticationContext()
            .getCache()
            .removeAll();

    //Set manager objects to null.
    MailManager.resetInstance();
    DiscoveryManager.resetInstance();
    AuthenticationManager.resetInstance();

    //Clear cookies.
    if(Build.VERSION.SDK_INT >= 21){
        CookieManager.getInstance().removeSessionCookies(null);
        CookieManager.getInstance().flush();
    } else {
        CookieManager.getInstance().removeSessionCookie();
        CookieSyncManager.createInstance(this);
        CookieSyncManager.getInstance().sync();
    }
}