- 初始化webView，使其支持javascript
WebSettings settings = mWebView.getSettings();
settings.setJavaScriptEnabled(true);
- 添加一个js交互对象
mWebView.addJavascriptInterface(new JavaObjectJsInterface(), "java_obj");
public class JavaObjectJsInterface {
@JavascriptInterface // 要加这个注解，不然调用不到
public void onHtml(String html) {
}
}
- 添加一个WebViewClient监听状态，并且在完成时通过js调用java对象的方法
mWebView.setWebViewClient(new MyWebViewClient());
public class MyWebViewClient extends WebViewClient {
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
Log.d(TAG, "onPageFinished: ");
mWebView.loadUrl("javascript:window.java_obj.onHtml('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
}
}
- 通过jsoup提取标签，需要在app的build.gradle中添加:
implementation 'org.jsoup:jsoup:1.9.2' // 获取/解析html文本
在onHtml()中解析：
public void onHtml(String html) {
Document document = Jsoup.parseBodyFragment(html);
if (document != null) {
Log.d(TAG, "onHtml: 解析document成功");
Elements elements = document.select(".video");
if (elements != null && !elements.isEmpty()) {
Element element = elements.get(0);
String src = element.attr("src");
}
}
}
