OkHttp Post Body as JSON

Just use JSONObject.toString(); method.And have a look at OkHttp's tutorial:

public static final MediaType JSON    = MediaType.parse("application/json; charset=utf-8");OkHttpClient client = new OkHttpClient();String post(String url, String json) throws IOException {  RequestBody body = RequestBody.create(JSON, json); // new  // RequestBody body = RequestBody.create(JSON, json); // old  Request request = new Request.Builder()      .url(url)      .post(body)      .build();  Response response = client.newCall(request).execute();  return response.body().string();}

You can create your own JSONObject then toString().

Remember run it in the background thread like doInBackground in AsyncTask.

OkHttp version > 4:

// create your json hereJSONObject jsonObject = new JSONObject();try {    jsonObject.put("KEY1", "VALUE1");    jsonObject.put("KEY2", "VALUE2");} catch (JSONException e) {    e.printStackTrace();}val client = OkHttpClient()val mediaType = "application/json; charset=utf-8".toMediaType()val body = jsonObject.toString().toRequestBody(mediaType)val request: Request = Request.Builder()            .url("https://YOUR_URL/")            .post(body)            .build()var response: Response? = nulltry {    response = client.newCall(request).execute()    val resStr = response.body!!.string()} catch (e: IOException) {    e.printStackTrace()}   

OkHttp version 3:

// create your json hereJSONObject jsonObject = new JSONObject();try {    jsonObject.put("KEY1", "VALUE1");    jsonObject.put("KEY2", "VALUE2");} catch (JSONException e) {    e.printStackTrace();}  OkHttpClient client = new OkHttpClient();  MediaType JSON = MediaType.parse("application/json; charset=utf-8");  // put your json here  RequestBody body = RequestBody.create(JSON, jsonObject.toString());  Request request = new Request.Builder()                    .url("https://YOUR_URL/")                    .post(body)                    .build();  Response response = null;  try {      response = client.newCall(request).execute();      String resStr = response.body().string();  } catch (IOException e) {      e.printStackTrace();  }

Another approach is by using FormBody.Builder().
Here's an example of callback:

Callback loginCallback = new Callback() {    @Override    public void onFailure(Call call, IOException e) {        try {            Log.i(TAG, "login failed: " + call.execute().code());        } catch (IOException e1) {            e1.printStackTrace();        }    }    @Override    public void onResponse(Call call, Response response) throws IOException {        // String loginResponseString = response.body().string();        try {            JSONObject responseObj = new JSONObject(response.body().string());            Log.i(TAG, "responseObj: " + responseObj);        } catch (JSONException e) {            e.printStackTrace();        }        // Log.i(TAG, "loginResponseString: " + loginResponseString);    }};

Then, we create our own body:

RequestBody formBody = new FormBody.Builder()        .add("username", userName)        .add("password", password)        .add("customCredential", "")        .add("isPersistent", "true")        .add("setCookie", "true")        .build();OkHttpClient client = new OkHttpClient.Builder()        .addInterceptor(this)        .build();Request request = new Request.Builder()        .url(loginUrl)        .post(formBody)        .build();

Finally, we call the server:

client.newCall(request).enqueue(loginCallback);