日志猫中的凌空错误消息"null"

Question

我已经向我朋友的服务器发出了发布请求。在我的 logcat 中，我收到 null 错误消息，没有响应正文或网络响应代码。

我使用了 VolleySingleton 模式，并为我的操作提出了正确类型的请求。从邮递员测试应用程序，一切似乎都运行良好，但在物理设备上运行它，我无法在日志中找到任何消息。

这是我的代码：

public class VolleySingleton {
public RequestQueue requestQueue;
public Context appContext;
public static VolleySingleton instanceVolley;
public VolleySingleton(Context mContext) {
    this.appContext = mContext;
    this.requestQueue = getRequestQueue();
}
public static synchronized VolleySingleton getVolleySingleton(Context context){
    if (instanceVolley == null){
        return new VolleySingleton(context);
    }
    return instanceVolley;
}
public RequestQueue getRequestQueue(){
    if (requestQueue == null){
        requestQueue = Volley.newRequestQueue(appContext.getApplicationContext());
    }
    return requestQueue;
}
public <T> void addToRequestQueue(Request<T> request){
    getRequestQueue().add(request);
    }
}

另外，这是我的帖子请求：

JSONObject userObject = new JSONObject();
        JSONObject paramsObject = new JSONObject();
        try {
            paramsObject.put("name", fullName);
            paramsObject.put("phone", mobile_No);
            paramsObject.put("gender", Gender);
            paramsObject.put("dob", unixTime);
            userObject.put("user", paramsObject);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, Constants.TING_SIGNUP_ENDPOINT, userObject, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                Log.d(TAG, "Response is:t " + response.toString());
                Snackbar.make(findViewById(android.R.id.content), R.string.sign_up_msg, Snackbar.LENGTH_LONG).show();
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        Intent signUpIntent = new Intent(SignUpActivity.this, LoginActivity.class);
                        signUpIntent.putExtra("fullNameKey", fullName);
                        startActivity(signUpIntent);
                    }
                }, 3000);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.d(TAG, "Failed with error msg:t" + error.getMessage());
                Log.d(TAG, "Error StackTrace: t" + error.getStackTrace());
                if (error.getMessage() == null){
                    createUser();
                }
            }
        }) {
            @Override
            protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
                int respCode = response.statusCode;
                Log.d(TAG, "Response Code is:t" + respCode);
                return super.parseNetworkResponse(response);
            }
        };
        jsonObjectRequest.setRetryPolicy(new DefaultRetryPolicy(60000, 0, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
        VolleySingleton.getVolleySingleton(this).addToRequestQueue(jsonObjectRequest);

请问有什么问题？谢谢

Answer 1

试试这个。

@Override
public void onErrorResponse(VolleyError error) {
    Log.d(TAG, "Failed with error msg:t" + error.getMessage());
    Log.d(TAG, "Error StackTrace: t" + error.getStackTrace());
    // edited here
    try {
        byte[] htmlBodyBytes = error.networkResponse.data;
        Log.e(TAG, new String(htmlBodyBytes), error);
    } catch (NullPointerException e) {
        e.printStackTrace();
    }
    if (error.getMessage() == null){
        createUser();
    }
}