Cannot get parameters from PHP when using Volley with JsonObjectRequest

Question

I am using the Volley framework with JsonObjectRequest request. I am using

JsonObjectRequest loginRequest = new JsonObjectRequest(b.toString(), params,
        new Listener<JSONObject>() {},
                    new Response.ErrorListener() {});

The params variable contains the parameters and it is a JSONObject.

The problem is that I cannot access any of these variables in my PHP code. $_POST or $_REQUEST variables gives me nothing.

I also tried something like below but no luck.

$data = json_decode(file_get_contents("php://input"));

kevinc13 · Accepted Answer · 2018-08-02 02:41:41Z

7

I encountered the same problem while using Volley with my PHP API. Turns out, a JSONObject of params is sent along as JSON. Therefore, PHP $_POST won't recognize it because it isn't in the format: param1=value1&param2=value

To see for yourself try: print file_get_contents("php://input");

The solution for me was to create a workaround class that extends Request<JSONObject> instead of using JsonObjectRequest

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.AuthFailureError;
import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.toolbox.HttpHeaderParser;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
* Custom Request Class for JSON
*/
public class CustomRequest extends Request<JSONObject> {

    private List params; // the request params
    private Response.Listener<JSONObject> listener; // the response listener

    public CustomRequest(int requestMethod, String url, List params,
        Response.Listener<JSONObject> responseListener, Response.ErrorListener errorListener) {

        super(requestMethod, url, errorListener); // Call parent constructor
        this.params = params;
        this.listener = responseListener;
    }

    // We have to implement this function
    @Override
    protected void deliverResponse(JSONObject response) {
        listener.onResponse(response); // Call response listener
    }

    // Proper parameter behavior
    @Override
    public Map <String, String> getParams() throws AuthFailureError {
        Map <String, String> map = new HashMap <String, String>();

        // Iterate through the params and add them to our HashMap
        for (BasicNameValuePair pair: params) {
            map.put(pair.getName(), pair.getValue());
        }

        return map;
    }

    // Same as JsonObjectRequest#parseNetworkResponse
    @Override
    protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
        try {
            String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
            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));
        }
    }

}

edited Aug 2, 2018 at 2:41

answered Jun 28, 2013 at 2:20

kevinc13

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4 Comments

Lefteris Over a year ago

Yes, this is unfortunately the problem. It does solve the issue with your custom request class.

Eric Cochran Over a year ago

Your blog post link is dead. :(

kevinc13 Over a year ago

@NightlyNexus sorry about that, it should be fixed now!

ken Over a year ago

@kxc1013 you just save my day..hahahaha

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