How to intercept POST data in an android webview

Question

I have an android app that consists of a webview. It needs to allow users to fill in a form on a webpage and then change the data of the form after the user has clicked

Answer 1

if you are submitting the form using postUrl() method then you can override the postUrl method in your WebView object like this.

 WebView mWebView = new WebView(this){

        @Override
        public void  postUrl(String  url, byte[] postData)
        {
            System.out.println("postUrl can modified here:" +url);
            super.postUrl(url, postData);
        }};
 LinearLayout linearLayout = (LinearLayout) findViewById(R.id.linearLayout);
 linearLayout.addView(mWebView);

Answer 2

I liked the suggestion for public void postUrl(String url, byte[] postData) , but unfortunately it did not work for me.

My solution for just intercepting the POST request:

• have a WebViewClient subclass that is set for WebView
• override public void onPageStarted(WebView view, String url, Bitmap favicon) to examine the request data and act accordingly (as per requirements)

Code excerpt & additional thoughts here: https://stackoverflow.com/a/9493323/2162226

Answer 3

I think you can use shouldInterceptRequest(WebView view, String url) method of WebViewClient, but it is supported in the API's later than 11.

Answer 4

If you are familiar with JavaScript, I would suggest you use JavaScript. I think it's more convenient and easy. This tour tells you how to use JavaScript in a WebView.

Answer 5

overriding onPageStarted callback in your WebView

Answer 6

I wrote a library with a special WebViewClient that offers a modified shouldOverrideUrlLoading where you can have access to post data.

https://github.com/KonstantinSchubert/request_data_webviewclient

Unfortunately, my implementation works for XMLHttpRequest (AJAX) requests only. But somebody else drafted already how this would be done for form data: https://github.com/KeejOow/android-post-webview

Between the two repositories, you should be able to find your answer :)