如何在eclipse中添加OkHttp的弃用代码？

Question

我是Android新手。请指导我。这是我的代码。如何使用OkHttp添加或更改代码？

 try { 
                    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                    //HttpClient httpclient = new DefaultHttpClient(); 
                    HttpClient httpclient =HttpClientBuilder.create().build();

                    try{
                    HttpPost httppost = new HttpPost("http://10.0.2.2/hari/test.php");

                    StringEntity se = new StringEntity("envelope",HTTP.UTF_8);
                    httppost.setEntity(se); 
                    HttpParams httpParameters = new BasicHttpParams();
                    // Set the timeout in milliseconds until a connection is established.
                    int timeoutConnection = 3000;
                    HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
                    // Set the default socket timeout (SO_TIMEOUT) 
                    // in milliseconds which is the timeout for waiting for data.
                    int timeoutSocket = 3000;
                    HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); 

                    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                    HttpResponse response = httpclient.execute(httppost);
                    HttpEntity entity = response.getEntity();
                    is = entity.getContent(); 
                    }

我在使用已弃用的代码时遇到了问题。如何在我的代码中使用OkHttp？我尝试在我的代码中包含OkHttp，但检测到更多错误。我正在使用Android API 20及更高版本。我也收到了utf_8的警告。

我该怎么办？