webView = (WebView) findViewById(R.id.info_detail_webview);

        WebSettings webSettings = webView.getSettings();

        webSettings.setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN);

        webSettings.setJavaScriptEnabled(true);

        // 添加js交互接口类，并起别名 imagelistner

        LogUtil.verbose("json", "url= " + newsList.Url);

        webView.loadUrl(newsList.Url);

        // 添加js交互接口类，并起别名 imagelistner

        webView.addJavascriptInterface(new JavascriptInterface(this), "imagelistner");

        webView.setWebViewClient(new MyWebViewClient());

    // js通信接口

    public class JavascriptInterface {

        private Context context;

        public JavascriptInterface(Context context) {

            this.context = context;

        }

        public void openImage(String img) {

            LogUtil.verbose("json", "img= " + img);

            Intent intent = new Intent();

            intent.putExtra("image", img);

            intent.setClass(context, ShowWebImageActivity.class);

            context.startActivity(intent);

        }

    }

    // 注入js函数监听

    private void addImageClickListner() {

        // 这段js函数的功能就是，遍历所有的img几点，并添加onclick函数，在还是执行的时候调用本地接口传递url过去

        webView.loadUrl("javascript:(function(){" +

        "var objs = document.getElementsByTagName(\"img\"); " +

                "for(var i=0;i<objs.length;i++)  " +

        "{"

                + "    objs[i].onclick=function()  " +

        "    {  "

                + "        window.imagelistner.openImage(this.src);  " +

        "    }  " +

        "}" +

        "})()");

    }

    /** 监听WebView加载URL进度  **/

    class MyWebViewClient extends WebViewClient {

        @Override

        public void onPageFinished(WebView view, String url) {

            // TODO Auto-generated method stub

            view.getSettings().setJavaScriptEnabled(true);

            // html加载完成之后，添加监听图片的点击js函数

            addImageClickListner();

            hideTopProgressBar();

            super.onPageFinished(view, url);

        }

        @Override

        public boolean shouldOverrideUrlLoading(WebView view, String url) {

            // TODO Auto-generated method stub

            return super.shouldOverrideUrlLoading(view, url);

        }

        @Override

        public void onPageStarted(WebView view, String url, Bitmap favicon) {

            // TODO Auto-generated method stub

            view.getSettings().setJavaScriptEnabled(true);

            super.onPageStarted(view, url, favicon);

        }

    }

    @Override

    public boolean onKeyDown(int keyCode, KeyEvent event) {

        // TODO Auto-generated method stub

        // 拦截系统的返回事件 调用webview的

        if(webView.canGoBack() && keyCode == KeyEvent.KEYCODE_BACK){

            webView.goBack();

            return true;

        }

        return super.onKeyDown(keyCode, event);

    }