How to Get HTML Content from XWalkView

XWalkView, a cross-platform web view component, enables displaying web content within native applications. Occasionally, the need arises to extract the HTML content rendered in XWalkView for various purposes like data analysis, sharing, or modification. This article will guide you through different methods to achieve this objective.

Methods to Retrieve HTML Content

1. JavaScript Injection

A straightforward approach involves injecting JavaScript code into the XWalkView to retrieve the HTML content using the document.documentElement.outerHTML property. This method is suitable for simple scenarios.

Steps:

• Create a JavaScript string containing the code to extract the HTML content.
• Execute the JavaScript code within XWalkView using evaluateJavascript() method.
• Retrieve the HTML content returned by the JavaScript code.

Code Example:

  String jsCode = "javascript: document.documentElement.outerHTML";
  xwalkView.evaluateJavascript(jsCode, new ValueCallback() {
      @Override
      public void onReceiveValue(Object value) {
          // Retrieve the HTML content from 'value'
      }
  });

2. XWalkView.getHTMLSource() Method

XWalkView provides a method getHTMLSource() that allows retrieving the source HTML of the loaded page. This approach provides the original HTML source, not the rendered content. It might be useful for scenarios where you need the original HTML for parsing.

Code Example:

  String htmlSource = xwalkView.getHTMLSource();
  // 'htmlSource' contains the HTML source of the loaded page.

3. WebResourceResponse

For advanced scenarios where modifications to the HTML content are needed, you can intercept the HTML response using the WebResourceResponse class. This approach enables customizing the response and retrieving the modified HTML.

Steps:

• Implement a custom XWalkResourceClient.
• Override the shouldInterceptRequest() method to intercept the requests to the desired URL.
• Create a new WebResourceResponse object, modify the HTML content as needed, and return the updated response.

Code Example:

  class CustomResourceClient extends XWalkResourceClient {
      @Override
      public WebResourceResponse shouldInterceptRequest(XWalkView view, String url) {
          if (url.equals("https://www.example.com")) {
              String modifiedHTML = "
Modified HTML
";
              return new WebResourceResponse("text/html", "UTF-8", new ByteArrayInputStream(modifiedHTML.getBytes()));
          }
          return super.shouldInterceptRequest(view, url);
      }
  }

Comparison

Conclusion

This article presented various methods to retrieve HTML content from XWalkView. Choose the method that best suits your requirements based on the complexity of the task and desired output. Remember to consider security implications and potential performance impact when implementing these techniques.