Android json to php and back

Question

I am sending a Json representation of an arraylist of custom objects to the server. I hope then to take that json object, decode into an array and retrieve the attributes and place them in MySQL. I think I am having an encoding issue. My php source code is written in notepad++ and is endcoded to utf-8. I believe Android encodes its source code and SQlite Datavabe in utf-8. The data that i use to construct the arraylist of my custom objects comes from SQLite.

When i POST a json object of my custom arraylist on the browser, the json is read successfully. However, when i send it via my android I get the error below. Someone please help?

Android code:

ArrayList<Article> list;
   list = recallSharedListFromDb();

    // Create json
    Gson gson = new GsonBuilder().create();
    String json_arrayList = gson.toJson(list);
        // Build parameters. 
        List<NameValuePair> param = new ArrayList<NameValuePair>();
        param.add(new BasicNameValuePair("jsonObj", json_object));

        JSONObject json = jsonParser.makeHttpRequest(url_register_code, "POST", param);

        // Read json response coming from server.
        Log.d("SyncToMySQL", "json string: "+ json.toString());

Php code:

//Get JSON posted by Android Application $json = $_POST["jsonObj"]; // this works... //Decode JSON into an Array $data = json_decode($json);

 $num_objects = count($data);

if($data){
$response["number of objects"] = $num_objects;
$response["success"] = 1;
echo $json. "<br><br>";;
 }else{
$response["number of objects"] = 0;
$response["success"] = 0;
 }

echo json_encode($response);

StackTrace:

  12-31 09:54:59.966: E/JSON Parser(1826): Error parsing data org.json.JSONException: Value (STRANGE LOOKING SYMBOLS) of    type java.lang.String cannot be converted to JSONObjec

score 0 · Answer 1 · answered Dec 31 '14 at 10:40

0

Missing header before sending data:

header('Content-type: application/json');
echo json_encode($response);;

answered Dec 31 '14 at 10:40

Kamil Adryjanek

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Could you please log this json respone with: Log.d("JSON: ", json.toString()); and paste it here. – Kamil Adryjanek Dec 31 '14 at 10:48
12-31 10:47:41.726: D/SyncToMySQL(1826): json string: {"number of objects":0,"success":0} – derek Dec 31 '14 at 10:50
Did you try this: http://stackoverflow.com/a/11734642/751387 - i think you have same issue – Kamil Adryjanek Dec 31 '14 at 11:01
And also try: header('Content-type=application/json; charset=utf-8'); – Kamil Adryjanek Dec 31 '14 at 11:02
i am still getting the same error. I am still getting the strange symbols where i indicated in the above stacktrace " STRANGE LOOKING SYMBOLS" – derek Dec 31 '14 at 11:11
they are the symbols that i am getting. the one in the image. top row. I will look into the article. – derek Dec 31 '14 at 11:15

score 0 · Answer 2 · answered Dec 31 '14 at 10:50

Add header('Content-type: application/json'); before sending json, like this

$num_objects = count($data);

if($data){
$response["number of objects"] = $num_objects;
$response["success"] = 1;
echo $json. "<br><br>";;
 }else{
$response["number of objects"] = 0;
$response["success"] = 0;
 }

header('Content-type: application/json');
echo json_encode($response);

Android json to php and back

2 Answers2