webView.clearCache(true);

webView.clearHistory();

 

if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {

  CookieSyncManager cookieSyncMngr=CookieSyncManager.createInstance(MainActivity.this);

  cookieSyncMngr.startSync();

  CookieManager cookieManager=CookieManager.getInstance();

  cookieManager.removeAllCookie();

  cookieManager.removeSessionCookie();

  cookieSyncMngr.stopSync();

  cookieSyncMngr.sync();

}else {

  CookieManager cookieManager = CookieManager.getInstance();

  cookieManager.removeAllCookies(new ValueCallback() {

        @Override

        public void onReceiveValue(Boolean value) {

        Log.d("onReceiveValue", value.toString());

        }

	});

	cookieManager.getInstance().flush();

}