android webview 获取h5中数据，然后回调给android

获取h5中数据

内部类不能被混淆，否则h5页面内找不到android中类
-keep class com.sohu.tv.activity.IndividualH5Activity$*{*;}


  webView.addJavascriptInterface(new HTMLHandler(), "handler");
  webView.loadUrl(getJsOfFetchMeta());
  
  
  
  class HTMLHandler {
        // api17以上必须要加此注解，否则js无法回调到这里
        @JavascriptInterface
        public void receive(final String h5PicUrl, final String h5ShareUrl, final String h5Title, final String h5Desc) {

            webView.post(new Runnable() {
                @Override
                public void run() {

                    LogManager.d(TAG, "sharePicUrl : " + h5PicUrl);
                    LogManager.d(TAG, "shareUrl : " + h5ShareUrl);
                    LogManager.d(TAG, "shareTitle : " + h5Title);
                    LogManager.d(TAG, "shareDesc : " + h5Desc);
                }
            });

        }
    }
    
    
    
     public static String getJsOfFetchMeta() {
        StringBuilder jsBuilder = new StringBuilder("javascript:");

        jsBuilder.append("var picUrl, url, desc, title;");
        jsBuilder.append("metas = window.parent.document.getElementsByTagName(\"meta\");");
        jsBuilder.append("for(i=0;i<metas.length;i++) {");
        jsBuilder.append("     if (metas[i].getAttribute(\"property\") == \"og:image\") { ");
        jsBuilder.append("          picUrl = metas[i].getAttribute(\"content\");");
        jsBuilder.append("     }");
        jsBuilder.append("     else if (metas[i].getAttribute(\"property\") == \"og:url\") { ");
        jsBuilder.append("          url = metas[i].getAttribute(\"content\");");
        jsBuilder.append("     }");
        jsBuilder.append("     else if (metas[i].getAttribute(\"property\") == \"og:title\") { ");
        jsBuilder.append("          title = metas[i].getAttribute(\"content\");");
        jsBuilder.append("     }");
        jsBuilder.append("     if (metas[i].getAttribute(\"property\") == \"og:desc\") { ");
        jsBuilder.append("          desc = metas[i].getAttribute(\"content\");");
        jsBuilder.append("     }");
        jsBuilder.append("}");
        jsBuilder.append("handler.receive(picUrl, url, title, desc);");

        LogManager.d("getJsOfFetchMeta", "jsBuilder = " + jsBuilder);
        return jsBuilder.toString();
    }