Android如何拦截WebView之中的Post或者Get请求

代码：

WebView webView = (WebView) findViewById(R.id.web_view);
webView.setWebViewClient(new WebViewClient() {

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        Toast.makeText(getApplicationContext(),
                 "WebViewClient.shouldOverrideUrlLoading",
                 Toast.LENGTH_SHORT);
        view.loadUrl(url);
        return true;
    }

    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        Toast.makeText(getApplicationContext(),
                      "WebViewClient.onPageStarted",
                      Toast.LENGTH_SHORT).show();
        //这儿可以截获网页的URL，可以都URL进行分析。
        //本例子之中是分析从通过RenRen登录成功后返回的access_token.
        if (url.contains("graph.renren.com/oauth/login_success.html")) {
            int start = url.indexOf("access_token") + "access_token=".length();
            int end = url.indexOf("expires_in") - 1;
            accessToken = url.substring(start, end);
        }
        super.onPageStarted(view, url, favicon);
    }
});
webView.loadUrl(myUrl);