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Android

Code Challenge 3/3 Getting Data from the web.

Now move the 'try' and two 'catch' blocks from the 'onCreate()' method to the 'doInBackground()' method. Leave the return statement as is, and then execute your custom async task from inside the 'onCreate()' method after 'setContentView()'.

Cant complete this challenge... i have been checking for any kind of error of wat i might be doing wrong but cant find anything. Please help me. Thanks for your time. Ziga :D here's the code:

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();
      private class CustomAsyncTask extends AsyncTask<Object, Void, String>{

        @Override
        protected String doInBackground(Object... arg0) {
        return "";
           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);
        }
        }
      }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_list);

      CustomAsyncTask customAsyncTask = new CustomAsyncTask();
          customAsyncTask.execute();       
    }
}

4 Answers

Move the return statement to the end of doInBackground. Having the return statement at the beginning of the method means that nothing below it will ever be executed, because the method will exit as soon as it hits the return statement.

If you paste that code into Eclipse, you'll probably get a compiler error that says "unreachable code" or something like that. Moving the return statement to the end of the method will fix that error.

The return statement needs to be at the end. Here is the code that worked for me:

@Override
    protected String doInBackground(Object... arg0) {
        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);
        }
        return "";
    }    
}

WOHO :D thx dude, this was really helpfoul. I get it now xD Thx for your help and time :D

Charles Welbeck
PLUS
Charles Welbeck
Courses Plus Student 9,745 Points

Compiler Error Please Help.

public static final String TAG = MainListActivity.class.getSimpleName();

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


  private class CustomAsyncTask extends AsyncTask<Object, Void, String>{
    @Override
    protected String doInBackground(Object... params){
      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);
    }
    }
      return "";
    }
}

}