Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Android

Posted by Rory Callendar
Rory Callendar
1,014 Points

I'm stuck on "Code Challenge: Moving Work from the Main Thread to an AsyncTask" ...task #2 ...

...is there a link to something somewhere that I might be able to peek at for a hint?

Beginning with @Override I have... protected String doInBackground(Object... arg) { (here's where I am stuck... when the challenge asks for "return a String" I don't know what String to return or how to do that...and then what does "simply return an empty string" mean) I've tried... return String + null

...but I know those are drastically off, because I am absolutely stumped here. Thanks for helping, Rory

PS> I feel like I have a pronoun without an antecedent. ....so sad (to be read with humorous tone...I'm happy as can be, actually).

2 Answers

Ernest Grzybowski
Ernest Grzybowski
Treehouse Project Reviewer

Hey Rory,

You were very close, but indeed your "idea" of what an empty string is, is incorrect. An empty string can be defined as:

String test = "";

This makes the final code for task #2:

package com.example;

import android.os.Bundle;
import android.view.View;
import java.io.IOException;
import java.net.MalformedURLException;
import android.util.Log;
import android.os.AsyncTask;

public class MainListActivity extends ListActivity {

    public static final String URL = "http://www.teamtreehouse.com";
    public static final String TAG = MainListActivity.class.getSimpleName();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_list);

        try {
            URL treehouseUrl = new URL(URL);
            HttpURLConnection connection = (HttpURLConnection) treehouseUrl.openConnection();
            connection.connect();
            int responseCode = connection.getResponseCode();
        }
        catch (MalformedURLException e) {
            Log.e(TAG, "MalformedURLException caught!", e);
        }
        catch (IOException e) {
            Log.e(TAG, "IOException caught!", e);
        }
    }
        private class CustomAsyncTask extends AsyncTask <Object, Void, String> {
          @Override
          protected String doInBackground(Object... args){
          return "";
          }
    }
}
Rory Callendar
Rory Callendar
1,014 Points
Rory Callendar
Rory Callendar
1,014 Points

I will give this a try! Thanks for replying, Rory.