WebView 相关知识点

//webview 的常用设置

final WebView webView = (WebView) findViewById(R.id.hot_app);
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);//设置js 可用
        webSettings.setSupportZoom(true);
        webSettings.setBuiltInZoomControls(true);//支持控件缩放
        webSettings.setAllowFileAccess(true);
        // webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
        webView.requestFocus();//可聚焦
        final String sUrl = Config.URL_HOT_APP;

        webView.setWebChromeClient(new WebChromeClient());
        webView.setWebViewClient(new WebViewClient()//采用内嵌的方式打开网页
        {
            public boolean shouldOverrideUrlLoading(WebView view, String url)
            {
                view.loadUrl(url);
                return true;
            }
        });

　　　　//支持文件下载
        webView.setDownloadListener(new DownloadListener()
        {
            public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength)
            {
                Uri uri = Uri.parse(url);
                Intent intent = new Intent(Intent.ACTION_VIEW, uri);
                startActivity(intent);
            }
        });

        webView.loadUrl(sUrl);

//session 缓存的处理
CookieSyncManager cookieSyncManager = CookieSyncManager.createInstance(context);
        CookieManager cookieManager = CookieManager.getInstance();
        cookieManager.removeSessionCookie();//移除sessino缓存 ，因为该操作另开线程执行，故当前线程可能需要等待2s 直到session被清除，再重新设置。
        try
        {
            Thread.sleep(2000);
        }
        catch (InterruptedException e)
        {
            e.printStackTrace();
        }
        
        cookieManager.setAcceptCookie(true);
        String mSessionValue = getSessionValue(sUrl);//获取session值
        String cookieString = "JSESSIONID=" + mSessionValue + " ; domain=oa.myemsp.cn";
        Trace.Log("cookieString  : "+cookieString);
        
        cookieManager.setCookie("oa.myemsp.cn", cookieString);//设置session值
        cookieSyncManager.sync();