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Android Build a Blog Reader Android App Getting Data from the Web Moving Work from the Main Thread to an AsyncTask

Posted by Asim Zaidi
Asim Zaidi
2,222 Points

Not sure what I am doing wrong here but I am getting I/O exception below is the code

package com.example.blogreader;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.ListActivity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;

public class MainListActivity extends ListActivity {
    protected String[] mHospitals;
    public static final int NUMBER_OF_HOSPITALS = 20;
    public static final String TAG = MainListActivity.class.getSimpleName();

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


        GetBlogPostsTask getBlogPostsTask = new GetBlogPostsTask();
        getBlogPostsTask.execute();

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main_list, menu);
        return true;
    }

    private class GetBlogPostsTask extends AsyncTask<Object, Void, String> {

        @Override
        protected String doInBackground(Object... arg0) {
            int reponseCode = -1;

            try {

                URL hospitalFeedUrl = new URL("http://blog.teamtreehouse.com/api/get_recent_summary/?count=" + NUMBER_OF_HOSPITALS);
                HttpURLConnection connection = (HttpURLConnection) hospitalFeedUrl.openConnection();
                connection.connect();
                reponseCode = connection.getResponseCode();
                Log.i(TAG, "Code " + reponseCode);
            } 
            catch (MalformedURLException e) {
                Log.e(TAG, "exception caught: ", e);    
            }
            catch (IOException e) {
                Log.e(TAG, "exception IO caught: ", e); 
            }
            catch(Exception e){
                Log.e(TAG, "General exception", e);
            }

            return "Code "+ reponseCode;    
        }

    }

}

2 Answers

Asim Zaidi
Asim Zaidi
2,222 Points
Asim Zaidi
Asim Zaidi
2,222 Points

I think thats the buffer issue. I was able to work around it like this

InputStream is = response.getEntity().getContent();
                        BufferedInputStream bis = new BufferedInputStream(is);
                        ByteArrayBuffer baf = new ByteArrayBuffer(20);
                        int current = 0;
                        while ((current = bis.read()) != -1) {
                            baf.append((byte) current);
                        }
                        /* Convert the Bytes read to a String. */
                        responseData = new String(baf.toByteArray());

                        is.close();
                        bis.close();
                        baf.clear();

However I wished there was a better way described in tutorial.

Ben Jakuben
STAFF
Ben Jakuben
Treehouse Teacher
Ben Jakuben
Ben Jakuben
Treehouse Teacher

Is this still an issue? Your code looks okay, so it could have been an intermittent error with the blog. If you are still getting the error, copy and paste all the detail you can about the IO exception.