js交互 获取网页信息

js交互

webView.addJavascriptInterface(new AndroidCall(this), "userInfo");

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@Override
public void onPageFinished(WebView view, String url) {
    super.onPageFinished(view, url);
    /**这个是加载网页首图的*/
    view.loadUrl("javascript:window.userInfo.showSource(document.getElementsByTagName('img')[0].src);");
    // 获取页面内容
    view.loadUrl("javascript:window.userInfo.showSource("
            + "document.getElementsByTagName('html')[0].innerHTML);");

    // 获取解析<meta name="description" content="获取到的值">
    view.loadUrl("javascript:window.userInfo.showDescription("
            + "document.querySelector('meta[name=\"description\"]').getAttribute('content')"
            + ");");;
    super.onPageFinished(view, url);
}

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获取想要的数据

@JavascriptInterface
public void showSource(String src) {

    Log.e("图片=",src); 
}
@JavascriptInterface
public void showDescription(String src) {

    Log.e("网页内容=",src); 
}