Question

All I want to do is use AsyncTask to do a http request. This is my code so far but I am not sure how to call this class from my main activity and how to get the results back. I have a String var “uri” that completes the url for my http request that I must pass to my class. after calling this class the next step is to pass the results (as a string) to a new function.

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;

class RequestTask 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("http://www.mywebsite.com/xml_data/" + uri + "_meeting_info.xml?id=cacheSTOP3"));
            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) {
     onPostExecute(result);
        //Do anything with response..
    }
}

Main Activity:

RequestTask getXML = new RequestTask();
getXML.execute(MyVarString);


//Now send the results from above to a new function 
Document doc = XMLfunctions.XMLfromString(getdata);

Answer 1

You should put your code

//Now send the results from above to a new function 
Document doc = XMLfunctions.XMLfromString(getdata);

somewhere at the end of onPostExecute(String result) method. It’s only way to perform your function after async task was executed.