android-VolleyPlus：NetworkDispatcher.run：未处理的异常java.lang.NullPointerException

概述我正在尝试运行以下代码：Map<String,Object>requestMap=newHashMap<>();LongunixTime=System.currentTimeMillis()/LONG_1000;requestMap.put(KEY_TIME,unixTime);JWTSignersigner=newJWTSigner(SECRET);Stringtoken=signer.sign(requestMap);Strin

我正在尝试运行以下代码：

Map<String, Object> requestMap = new HashMap<>();Long unixTime = System.currentTimeMillis() / LONG_1000;requestMap.put(KEY_TIME, unixTime);JWTSigner signer = new JWTSigner(SECRET);String token = signer.sign(requestMap);String url = BASE_URI + "/Data/CategorIEs?d=" + token;StringRequest stringRequest =  new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {    @OverrIDe    public voID onResponse(String response) {        Log.d(TAG, response);    }}, new Response.ErrorListener() {    @OverrIDe    public voID one rrorResponse(VolleyError error) {        Log.e(TAG, error.getLocalizedMessage());    }});RequestQueue mRequestQueue = Volley.newRequestQueue(getActivity());mRequestQueue.add(stringRequest);

但是我收到以下错误：

[6056] Networkdispatcher.run: Unhandled exception java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object java.util.Map.get(java.lang.Object)' on a null object referencejava.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object java.util.Map.get(java.lang.Object)' on a null object reference    at com.androID.volley.toolBox.httpheaderParser.parseCharset(httpheaderParser.java:243)    at com.androID.volley.toolBox.httpheaderParser.parseCharset(httpheaderParser.java:262)    at com.androID.volley.request.StringRequest.parseNetworkResponse(StringRequest.java:70)    at com.androID.volley.Networkdispatcher.run(Networkdispatcher.java:133)java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object java.util.Map.get(java.lang.Object)' on a null object reference

我不知道问题出在哪里.有人可以帮忙吗？

提前致谢.

解决方法:

您需要在StringRequest中重写parseNetworkResponse方法,并修复一个不会出现空标题映射的漏洞：

StringRequest stringRequest =  new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {    @OverrIDe    public voID onResponse(String response) {        Log.d(TAG, response);    }}, new Response.ErrorListener() {    @OverrIDe    public voID one rrorResponse(VolleyError error) {        Log.e(TAG, error.getLocalizedMessage());    }}) {    @OverrIDeprotected Response<String> parseNetworkResponse(NetworkResponse response) {        if (response.headers == null)        {            // cant just set a new empty map because the member is final.            response = new NetworkResponse(                               response.statusCode,                               response.data,                               Collections.<String, String>emptyMap(), // this is the important line, set an empty but non-null map.                               response.notModifIEd,                               response.networkTimeMs);        }        return super.parseNetworkResponse(response);    }};

希望这可以帮助.

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