Android Java - OkHttp Post Execute

/*
    import com.squareup.okhttp.Callback;
    import com.squareup.okhttp.MultipartBuilder;
    import com.squareup.okhttp.OkHttpClient;
    import com.squareup.okhttp.Request;
    import com.squareup.okhttp.RequestBody;
    import com.squareup.okhttp.Response;
*/
       
       OkHttpClient client = new OkHttpClient();

        RequestBody requestBody = new MultipartBuilder()
                .type(MultipartBuilder.FORM)
                .addFormDataPart("key", "value")
                .build();
        Request request = new Request.Builder()
                .url("http://www..")
                .post(requestBody)
                .build();

        try {
            Response response = client.newCall(request).execute();
            String responseString = response.body().string();
            response.body().close();
   
        } catch (Exception e) {
            e.printStackTrace();
        }