或者，我如何确保 error.networkResponse 在
onErrorResponse?
我的第一个想法是检查对象是否为空。
@Override
public void onErrorResponse(VolleyError error) {
NetworkResponse networkResponse = error.networkResponse;
if (networkResponse != null && networkResponse.statusCode == HttpStatus.SC_UNAUTHORIZED) {
// HTTP Status Code: 401 Unauthorized
}
}
或者，您也可以尝试通过扩展Request 类并覆盖parseNetworkResponse 来获取状态码。
例如，如果扩展抽象 Request<T> 类
public class GsonRequest<T> extends Request<T> {
...
private int mStatusCode;
public int getStatusCode() {
return mStatusCode;
}
...
@Override
protected Response<T> parseNetworkResponse(NetworkResponse response) {
mStatusCode = response.statusCode;
try {
Log.d(TAG, "[raw json]: " + (new String(response.data)));
Gson gson = new Gson();
String json = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
return Response.success(gson.fromJson(json, mClazz),
HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
} catch (JsonSyntaxException e) {
return Response.error(new ParseError(e));
}
}
...
}
或者，如果您正在使用已经扩展了抽象 Request<T> 类的工具箱类之一，并且您不想混淆 parseNetworkResponse(NetworkResponse networkResponse) 的实现，请继续覆盖该方法但通过 @ 返回超级的实现987654329@
例如StringResponse
public class MyStringRequest extends StringRequest {
private int mStatusCode;
public MyStringRequest(int method, String url, Listener<String> listener,
ErrorListener errorListener) {
super(method, url, listener, errorListener);
}
public int getStatusCode() {
return mStatusCode;
}
@Override
protected Response<String> parseNetworkResponse(NetworkResponse response) {
mStatusCode = response.statusCode;
return super.parseNetworkResponse(response);
}
}
用法：
public class myClazz extends FragmentActivity {
private Request mMyRequest;
...
public void makeNetworkCall() {
mMyRequest = new MyNetworkRequest(
Method.GET,
BASE_URL + Endpoint.USER,
new Listener<String>() {
@Override
public void onResponse(String response) {
// Success
}
},
new ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (mMyRequest.getStatusCode() == 401) {
// HTTP Status Code: 401 Unauthorized
}
}
});
MyVolley.getRequestQueue().add(request);
}
当然，覆盖内联方法的选项也是可用的
public class MyClazz extends FragmentActivity {
private int mStatusCode;
...
public void makeNetworkCall() {
StringRequest request = new StringRequest(
Method.GET,
BASE_URL + Endpoint.USER,
new Listener<String>() {
@Override
public void onResponse(String response) {
// Success
}
},
new ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (mStatusCode == 401) {
// HTTP Status Code: 401 Unauthorized
}
}
}) {
@Override
protected Response<String> parseNetworkResponse(NetworkResponse response) {
mStatusCode = response.statusCode;
return super.parseNetworkResponse(response);
}
};
MyVolley.getRequestQueue.add(request);
}
更新：
HttpStatus 已弃用。请改用HttpURLConnection。见Link。