Problems with AsyncTask crash the application

I'm developing an online chat that should update itself all the time, the problem is that every query hangs the application for a few seconds. I had already asked a similar question in: How to make connections to a php work in background in Android but it was not exactly what I wanted.

I need pages not to crash the app in every query . I've heard about backgroundWoker and Service but honestly no I have no idea what I might be doing wrong.

I'm using MySQL + PHP + JSON.

Here's my code:

package com.Dannark.livechat;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.os.AsyncTask;
import android.util.Log;

class Connect extends AsyncTask<String, String, String>{

    @Override
    protected String doInBackground(String... uri) {
        HttpClient httpclient = new DefaultHttpClient();
        HttpResponse response;
        String responseString = null;
        try {
            response = httpclient.execute(new HttpGet(uri[0]));
            StatusLine statusLine = response.getStatusLine();
            if(statusLine.getStatusCode() == HttpStatus.SC_OK){
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                response.getEntity().writeTo(out);
                out.close();
                responseString = out.toString();
            } else{
                //Closes the connection.
                response.getEntity().getContent().close();
                throw new IOException(statusLine.getReasonPhrase());
            }
        } catch (ClientProtocolException e) {
            //TODO Handle problems..
        } catch (IOException e) {
            //TODO Handle problems..
        }
        return responseString;
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        Log.e("-- MYSQL --",result);
        //Do anything with response..
    }
}

EDIT: And I'm interacting with the connect class with the Connect class like this:

package com.Dannark.livechat;

import android.os.AsyncTask;
import android.os.Build;
import android.util.Log;

public class Conectar {

    String response;
    int status;

    public Conectar(String website){
        //First - send request to server
        AsyncTask<String,String,String> task;
        String uri = website;       //  www.meusite.com/get_chat/?room=10


        try {
            task = new Connect().execute(uri);
            response = task.get();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }

}

And finally the class conectar this way:

Conectar Conn = new Conectar("http://animesslife.engine001.com/chat/login.php?login=" + campoLogin.getText() + "&senha=" + campoSenha.getText() );
Log.i("-RESPOSTA-",Conn.response); //Conn.response seria a resposta no decodificada em JSON

Should I use another method instead of this?