Make Android WebView not store cookies or passwords

Question

I use an Android WebView for Twitter OAuth: Twitter asks the user to log in and authorize the application, I retrieve the access token and persist it in my application.

I have no need (and do not) store the user password, but the WebView keeps Twitter's cookies around, and it also asks the user if he wants it to remember the password. As a result of this, even after the de-authorizes the application via his Twitter account page, and my application destroys the access tokens, the next time the WebView is opened, it is probably still logged in, and even if not, it has the password box already filled.

How can I force WebView to not ask to remember passwords, and to not persist session cookies? If that is not possible, can I delete all its stored state (except maybe the image cache)?

Answer 1

For not saving passwords:

WebView webview = new WebView(this);
WebSettings mWebSettings = webview.getSettings();
mWebSettings.setSavePassword(false);
mWebSettings.setSaveFormData(false);

For cookies:

CookieManager cookieManager = CookieManager.getInstance();
cookieManager.setAcceptCookie(false);

I am not very sure for the cookies implementation.

Answer 2

You can use this to prevent cookies from being stored and clean cookies already stored:

CookieSyncManager.createInstance(this);
CookieManager cookieManager = CookieManager.getInstance();
cookieManager.removeAllCookies(callback);
cookieManager.setAcceptCookie(false);

WebView webview = new WebView(this);
WebSettings ws = webview.getSettings();
ws.setSaveFormData(false);
ws.setSavePassword(false); // Not needed for API level 18 or greater (deprecated)

Answer 3

In one line, Try this. I think this should be called after starting the webview.

android.webkit.CookieManager.getInstance().removeAllCookie();

Answer 4

This is the best answer I have seen in this context

    webView.clearCache(true);
    webView.clearHistory();
    WebSettings webSettings = webView.getSettings();
    webSettings.setSaveFormData(false);
    webSettings.setSavePassword(false); // Not needed for API level 18 or greater (deprecated)

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP_MR1) {
        CookieManager.getInstance().removeAllCookies(null);
        CookieManager.getInstance().flush();
    } else {
        CookieSyncManager cookieSyncMngr = CookieSyncManager.createInstance(this);
        cookieSyncMngr.startSync();
        CookieManager cookieManager = CookieManager.getInstance();
        cookieManager.removeAllCookie();
        cookieManager.removeSessionCookie();
        cookieSyncMngr.stopSync();
        cookieSyncMngr.sync();
    }

Answer 5

Don't clear cookies beacause it will effect other sessions like facebook etc.. stored inside the cookie so try to follow this method

Before oauth transaction such as before the webview creation

CookieManager cookieManager = CookieManager.getInstance();
cookieManager.setAcceptCookie(false);

After oauth transaction let accept cookie by setting

cookieManager.setAcceptCookie(true);

it will work i have tested it..

Answer 6

I have used following solution:

CookieManager cookieManager = CookieManager.getInstance();
cookieManager.setAcceptCookie(false);

Following method does not worked for me:

CookieManager cookieManager = CookieManager.getInstance();
cookieManager.removeAllCookie();

A possible reason may be that we have not synced the cookies as following:

CookieSyncManager.createInstance(getContext()).sync();

But it may be taking time.

Forcing WebView to not ask to remember passwords will also not work.

And it is also not good for usability.