我需要在我的 Android 应用程序的 shouldInterceptRequest 中检查请求是 POST 还是 GET。请参见下面的代码：
public class CustomWebViewClient extends WebViewClient {
...
@Override
public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
if ("request is POST")
Log.d("CustomWebViewClient", "request is a POST");
else if ("request is GET")
Log.d("CustomWebViewClient", "request is a GET");
...
}
}
是否可以在 WebViewClient 的扩展中确定这一点？
可以通过扩展 WebViewClient 来实现，但它可能涉及比您预期更多的工作。WebViewClient 中的回调方法由 JNI 调用，您无法调用它来获取标头和方法，因此最好的选择是使用 JavaScript。
该解决方案基于 kristof 对http://code.google.com/p/android/issues/detail?id=9122#c21的评论
HTMLFormElement.prototype._submit = HTMLFormElement.prototype.submit;
HTMLFormElement.prototype.submit = interceptor;
window.addEventListener('submit', function(e) {
interceptor(e);
}, true);
function interceptor(e) {
var frm = e ? e.target : this;
interceptor_onsubmit(frm);
frm._submit();
}
function interceptor_onsubmit(f) {
var jsonArr = [];
for (i = 0; i < f.elements.length; i++) {
var parName = f.elements[i].name;
var parValue = f.elements[i].value;
var parType = f.elements[i].type;
jsonArr.push({
name : parName,
value : parValue,
type : parType
});
}
window.interception.customSubmit(JSON.stringify(jsonArr),
f.attributes['method'] === undefined ? null : f.attributes['method'].nodeValue,
f.attributes['enctype'] === undefined ? null : f.attributes['enctype'].nodeValue);
}
lastXmlhttpRequestPrototypeMethod = null;
XMLHttpRequest.prototype.reallyOpen = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function(method, url, async, user, password) {
lastXmlhttpRequestPrototypeMethod = method;
this.reallyOpen(method, url, async, user, password);
};
XMLHttpRequest.prototype.reallySend = XMLHttpRequest.prototype.send;
XMLHttpRequest.prototype.send = function(body) {
window.interception.customAjax(lastXmlhttpRequestPrototypeMethod, body);
lastXmlhttpRequestPrototypeMethod = null;
this.reallySend(body);
};
根据需要更改包/类名称。
public class JavascriptPostIntercept {
public interface JavascriptPostInterceptInterface {
public void nextMessageIsAjaxRequest(AjaxRequestContents contents);
public void nextMessageIsFormRequest(FormRequestContents contents);
}
private static String sInterceptHeader;
private JavascriptPostInterceptInterface mClient;
public static String getInterceptHeader() {
if (sInterceptHeader == null) {
// Assuming you have your own stream to string implementation
sInterceptHeader = StringUtils.readInputStream(
Resources.getSystem().openRawResource(R.raw.post_interceptor));
}
return sInterceptHeader;
}
public static class AjaxRequestContents {
private String mMethod;
private String mBody;
public AjaxRequestContents(String method, String body) {
mMethod = method;
mBody = body;
}
public String getMethod() {
return mMethod;
}
public String getBody() {
return mBody;
}
}
public static class FormRequestContents {
private String mJson;
private String mMethod;
private String mEnctype;
public FormRequestContents(String json, String method, String enctype) {
mJson = json;
mMethod = method;
mEnctype = enctype;
}
public String getJson() {
return mJson;
}
public String getMethod() {
return mMethod;
}
public String getEnctype() {
return mEnctype;
}
}
public JavascriptPostIntercept(JavascriptPostInterceptInterface client) {
mClient = client;
}
@JavascriptInterface
public void customAjax(final String method, final String body) {
mClient.nextMessageIsAjaxRequest(new AjaxRequestContents(method, body));
}
@JavascriptInterface
public void customSubmit(String json, String method, String enctype) {
mClient.nextMessageIsFormRequest(new FormRequestContents(json, method, enctype));
}
}
下面的代码仅获取最新请求的 HTTP 方法，这看起来足以满足您的要求，但显然 AjaxRequestContents 和 FormSubmitContents 上的其他方法将使您能够访问帖子正文和其他内容（如果需要）。
class MyWebViewClient extends WebViewClient implements JavascriptPostIntercept.JavascriptPostInterceptInterface {
private String mLastRequestMethod = "GET";
/// evaluate post_interceptor.js after the page is loaded
@Override
public void onPageFinished(WebView view, String url) {
view.loadUrl("javascript: " + JavascriptPostIntercept.getInterceptHeader());
}
@TargetApi(11)
@Override
public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
if (mLastRequestMethod.equals("POST")) {
// do stuff here...
} else if (mLastRequestMethod.equals("GET")) {
// do other stuff here...
}
// return something here...
}
@Override
public void nextMessageIsAjaxRequest(JavascriptPostIntercept.AjaxRequestContents contents) {
mLastRequestMethod = contents.getMethod();
}
@Override
public void nextMessageIsFormRequest(JavascriptPostIntercept.FormRequestContents contents) {
mLastRequestMethod = contents.getMethod();
}
}
MyWebViewClient webViewClient = new MyWebViewClient();
mWebView.setWebViewClient(webViewClient);
mWebView.addJavascriptInterface(new JavascriptPostIntercept(webViewClient), "interception");
的覆盖shouldInterceptRequest(WebView view, WebResourceRequest request)方法WebViewClient。
例如
@Override
public WebResourceResponse (WebView view, WebResourceRequest request) {
Log.i("shouldInterceptRequest", "method:" + request.method)
}