尝试扩展JsonObjectRequest的JSONException

时间:2016-02-17 23:11:04

标签: android android-volley jsonresponse

我遇到了语法问题,但我无法弄清楚出了什么问题。看起来这个帖子有答案,但它对我有用。

JSONException: Value of type java.lang.String cannot be converted to JSONObject

我正在使用Volley我需要扩展JsonObjectRequest,以便我可以访问响应中的http标头。这是我的“CustomRequest”

public class CustomRequest extends JsonObjectRequest {

    public CustomRequest(int method, String url, String jsonRequest,
                         Response.Listener<JSONObject> listener, Response.ErrorListener errorListener) {
        super(method, url, jsonRequest, listener, errorListener);
    }

    @Override
    protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
        try {
            // Save http headers
            mHeaders = response.headers;
            String jsonString = new String(response.data,
                    HttpHeaderParser.parseCharset(response.headers, PROTOCOL_CHARSET));
            return Response.success(new JSONObject(jsonString),
                    HttpHeaderParser.parseCacheHeaders(response));
        } catch (UnsupportedEncodingException e) {
            return Response.error(new ParseError(e));
        } catch (JSONException je) {
            return Response.error(new ParseError(je));
        }
    }

    private Map<String, String> mHeaders = new HashMap<>();


    @Override
    public Map<String, String> getHeaders() throws AuthFailureError {
        return mHeaders;
    }
}

这里是我的测试类:

private void testVolleyRequest() {
    String url = "http://my-json-feed";

    CustomRequest jsonRequest = new CustomRequest
            (Request.Method.GET, url, (String)null, new Response.Listener<JSONObject>() {

                @Override
                public void onResponse(JSONObject response) {
                    Log.d("[TEST]", "Response: " + response.toString());
                }
            }, new Response.ErrorListener() {

                @Override
                public void onErrorResponse(VolleyError error) {
                    Log.d("[TEST]", "error = "+error.toString());
                }
            });

    Volley.newRequestQueue(this).add(jsonRequest);
}

如果我尝试上面的示例,我会继续:

com.android.volley.ParseError: org.json.JSONException: Value <html><head><meta of type java.lang.String cannot be converted to JSONObject

但我正在返回一个JSONObject:

        return Response.success(new JSONObject(jsonString),
                HttpHeaderParser.parseCacheHeaders(response));

如果有人能发现这个问题,我非常感谢。

THX!

1 个答案:

答案 0 :(得分:0)

thx boukharist,

上面的url没有提供有效的json文件。我改为:

String url =“http://httpbin.org/get?site=code&network=tutsplus”;

它有效!