HTTPResponse esp8266 android

Hello,
i am using GitHub - itead/ITEADLIB_Arduino_WeeESP8266: An easy-to-use Arduino ESP8266 library besed on AT firmware. this library code for my esp8266,
and now for the response code i have to use this :

char *hello = "Hello,";

        
        if(wifi.send(mux_id, (const uint8_t*)hello, strlen(hello))) {
            Serial.print("send back ok\r\n");
        } else {
            Serial.print("send back err\r\n");
        }

the problem is if i use explorer on windows i get the response
but when i use android application i dont get any response and is show me blank response.

my android code for this part is :

 public String sendRequest(String parameterValue, String ipAddress, String portNumber, String parameterName) {
        String serverResponse = "ERROR";

        try {

            HttpClient httpclient = new DefaultHttpClient(); // create an HTTP client
            // define the URL e.g. http://myIpaddress:myport/?pin=13 (to toggle pin 13 for example)
            URI website = new URI("http://"+ipAddress+":"+portNumber+"/?"+parameterName+"="+parameterValue);
            HttpGet getRequest = new HttpGet(); // create an HTTP GET object
            getRequest.setURI(website); // set the URL of the GET request
            HttpResponse response = httpclient.execute(getRequest); // execute the request
            // get the ip address server's reply
            InputStream content = null;
            content = response.getEntity().getContent();
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    content
            ));
            serverResponse = in.readLine();
            // Close the connection
            content.close();
        } catch (ClientProtocolException e) {
            // HTTP error
            serverResponse = e.getMessage();
            e.printStackTrace();
        } catch (IOException e) {
            // IO error
            serverResponse = e.getMessage();
            e.printStackTrace();
        } catch (URISyntaxException e) {
            // URL syntax error
            serverResponse = e.getMessage();
            e.printStackTrace();
        }
        // return the server's reply/response text
        return serverResponse;
    }

i think the problem is i have char as a replay but in my android code there is string and i have no idea how to fix it.
anyone can help me please?
thanks

Anyone please?

i think the problem is i have char as a replay

I have no idea what this is supposed to mean.

but in my android code there is string

I don't see any string objects in your Android code. There ARE String objects, but they are NOT the same as strings or strIngs or sTriNgS or any other variation of the letters 's', 't', 'r', 'i', 'n', and 'g'.