sudhishkr sudhishkr - 2 months ago 6
Java Question

Android Volley POST ServerError

I am trying to make a POST call on an endpoint for a pet project from my android app.

I am using

volley
library and I am hitting this error :
com.android.volley.ServerError
with
message
as
NULL
. (I am having a hard time trying to figure out what am I doing wrong)

I have ensured I have given internet connection option in my manifest :
<uses-permission android:name="android.permission.INTERNET" />


Also my endpoint is accessible via curl for testing :

curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -H "Postman-Token: 122eedf5-8ca5-c1a6-06d9-5cc1986d2b23" -d '{
"departure_time" : "2016-07-21 07:00:00",
"arrival_time" : "2016-07-21 08:30:00",
"location_flow": ["Milpitas+ca", "SanCarlos+Ca"],
"buffer_time": [0, 30, 0],
"mode": "driving"
}' "https://sudtrafficalarm.herokuapp.com/v1/wakecheck"


output :

{
"estimated_arrival_time": "2016-07-21 08:05:01",
"journey_duration": 2101,
"wake_status": false
}


This is my main activity :

package com.sudhishkr.sudtrafficalarmandroid;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final RequestQueue queue = Volley.newRequestQueue(this);
Button button = (Button) findViewById(R.id.button);

button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//Toast.makeText(MainActivity.this, SystemTime.date2String(SystemTime.getCurrentTime()), Toast.LENGTH_SHORT).show();
final String REGISTER_URL = "https://sudtrafficalarm.herokuapp.com/v1/wakecheck";
JsonObjectRequest jsonRequest = new JsonObjectRequest(Request.Method.POST, REGISTER_URL, getJsonData(),
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Toast.makeText(MainActivity.this, response.toString(), Toast.LENGTH_SHORT).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, error.toString(), Toast.LENGTH_SHORT).show();
}
}
);
queue.add(jsonRequest);


}
});
}

public JSONObject getJsonData() {
JSONObject params = new JSONObject();
try {
params.put("departure_time", "2016-07-21 07:00:00");
params.put("arrival_time", "2016-07-21 08:30:00");
params.put("mode", "driving");
JSONArray address = new JSONArray();
address.put("Milpitas+ca");
address.put("SanCarlos+Ca");
params.put("location_flow", address);
} catch (JSONException e) {
e.printStackTrace();
}
return params;
}


}


Debugging the code - takes me here. And I have no message or information as to why this occurs.

enter image description here

Answer

You have not added 'buffer_time' parameter in your Android code. See the curl request, POST data is different than what you submit from Android code. Your getJsonData() should look like below (I created a demo project and made changes, I can see the expected response):

public JSONObject getJsonData() {
    JSONObject params = new JSONObject();
    try {
        params.put("departure_time", "2016-07-21 07:00:00");
        params.put("arrival_time", "2016-07-21 08:30:00");
        params.put("mode", "driving");
        JSONArray address = new JSONArray();
        address.put("Milpitas+ca");
        address.put("SanCarlos+Ca");
        params.put("location_flow", address);

        JSONArray buffer_time = new JSONArray();
        buffer_time.put(0);
        buffer_time.put(30);
        buffer_time.put(0);
        params.put("buffer_time", buffer_time);
    } catch (JSONException e) {
        e.printStackTrace();
    }
    return params;
}
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