Sending JSON body through POST request in OKhttp in Android

Try this

Add Gradle depends compile 'com.squareup.okhttp3:okhttp:3.2.0'

public static JSONObject foo(String url, JSONObject json) {        JSONObject jsonObjectResp = null;        try {            MediaType JSON = MediaType.parse("application/json; charset=utf-8");            OkHttpClient client = new OkHttpClient();            okhttp3.RequestBody body = RequestBody.create(JSON, json.toString());            okhttp3.Request request = new okhttp3.Request.Builder()                    .url(url)                    .post(body)                    .build();            okhttp3.Response response = client.newCall(request).execute();            String networkResp = response.body().string();            if (!networkResp.isEmpty()) {                jsonObjectResp = parseJSONStringToJSONObject(networkResp);            }        } catch (Exception ex) {            String err = String.format("{\"result\":\"false\",\"error\":\"%s\"}", ex.getMessage());            jsonObjectResp = parseJSONStringToJSONObject(err);        }        return jsonObjectResp;    }

Parse Response

   private static JSONObject parseJSONStringToJSONObject(final String strr) {    JSONObject response = null;    try {        response = new JSONObject(strr);    } catch (Exception ex) {        //  Log.e("Could not parse malformed JSON: \"" + json + "\"");        try {            response = new JSONObject();            response.put("result", "failed");            response.put("data", strr);            response.put("error", ex.getMessage());        } catch (Exception exx) {        }    }    return response;}

Just do this:

@Overridepublic void writeTo(BufferedSink sink) throws IOException {     sink.writeUtf8(yourJsonString); }

And it should work fine :-) If I understand the documentation correctly, sink is a container into which you can write the data you want to post. The writeUtf8 method is convenience for turning the String into bytes, using the UTF-8 encoding.