Send array by volley android to php

Question

I'm trying to write a small code that send array from my android application by volley android to php file a that will write the array in text file here is my array

>String[] title = {
                    "Abundance",
                    "Anxiety",
                    "Bruxism",
                    "Discipline",
                    "Drug Addiction"
            };

my volley code:

>UploadRequest registerRequest = new UploadRequest(title, responseListener);
            RequestQueue volleyQueue = Volley.newRequestQueue(MainActivity.this);
            DiskBasedCache cache = new DiskBasedCache(getCacheDir(), 64 * 2048 * 2048);
            volleyQueue = new RequestQueue(cache, new BasicNetwork(new HurlStack()));
            volleyQueue.start();
            volleyQueue.add(registerRequest);

---

my stringRequest class UploadRequest.java

public class UploadRequest extends StringRequest {
private static final String REGISTER_REQUEST_URL ="http://192.168.2.115/app/Register.php";
private Map<String, String> params;

public UploadRequest(String[] names, Response.Listener<String> listener) {
    super(Method.POST, REGISTER_REQUEST_URL, listener, null);
    params = new HashMap<>();
    
    params.put("names", String.valueOf(names));//i think my problem is here!

}

@Override
public Map<String, String> getParams() {
    return params;
}

}

my Register.php file

$value = $_POST['names'];

$fp = fopen('Log.txt', 'w');

fwrite($fp, $value);

fclose($fp);

the output of the php file in the text file 'Log.txt' that came from the array

[Ljava.lang.String;@41c509a8

So my problem the array comes wrong or I didnt declare the array! so please how can I declare it.

Thanks for all

Answer 1

You need to send array values , instead of reference hash code so use Arrays.toString

 params.put("names", Arrays.toString(names));

---

    String[] title = {
            "Abundance",
            "Anxiety",
            "Bruxism",
            "Discipline",
            "Drug Addiction"
    };
    System.out.println(Arrays.toString(title));
    System.out.println(String.valueOf(title));

Output :

[Abundance, Anxiety, Bruxism, Discipline, Drug Addiction]
[Ljava.lang.String;@14eac69

Option 2.

You can create JSONARRAY and put values into JSONARRAY and later use jsonarray.toString()

    JSONArray array = new JSONArray();
    array.put("Abundance");
    array.put("Anxiety");
    array.put("Bruxism");
    System.out.println(array.toString());

output :

["Abundance","Anxiety","Bruxism"]

Answer 2

params.put("names", String.valueOf(names));//i think my problem is here!

Indeed. Better try something like:

params.put("names[0]", names[0]);
params.put("names[1]", names[1]);
params.put("names[2]", names[2]);
.... of course you would make a loop for it

Or:

params.put("names0", names[0]);
params.put("names1", names[1]);
params.put("names2", names[2]);
......

Your php script would be different for the two cases.