Question

I am trying to make my application post something to my webserver (located at IP 10.0.2.2) and receive the response. I’m using a HttpHelper object to do all the server-interaction methods. At the moment my response variable is not getting anything back. Through debugging I know that the loop:

while ((line = rd.readLine()) != null) {

is never entered, but it should be entered because it should receive the line ‘OK’ surely?

Thanks very much for your help!

The webpage code is just:

header("HTTP/1.1 200 OK");

The java code is:

        List<NameValuePair> data = new ArrayList<NameValuePair>();
        HttpHelper httpHelper = new HttpHelper("http://10.0.2.2/", data);
        StringBuilder response = httpHelper.postData();

…

public class HttpHelper {
final HttpClient client;
final HttpPost post;
final List<NameValuePair> data;

public HttpHelper(String address, List<NameValuePair> data) {
    client = new DefaultHttpClient();
    post = new HttpPost(address);
    this.data = data;
}

private class GetResponseTask extends AsyncTask<Void, Void, StringBuilder> {
    protected StringBuilder doInBackground(Void... arg0) {
        try {
            HttpResponse response = client.execute(post);
            return inputStreamToString(response.getEntity().getContent());
        } catch (ClientProtocolException e) {
            Log.e("debug", e.getLocalizedMessage());
        } catch (IOException e) {
            Log.e("debug", e.getLocalizedMessage());
        }
        return null;
    }
}

public StringBuilder postData() {
    try {
        post.setEntity(new UrlEncodedFormEntity(data));
        return (new GetResponseTask().execute()).get();
    } catch (UnsupportedEncodingException e) {
        Log.e("debug", e.getLocalizedMessage());
    } catch (InterruptedException e) {
        Log.e("debug", e.getLocalizedMessage());
    } catch (ExecutionException e) {
        Log.e("debug", e.getLocalizedMessage());
    }
    return null;
}

private StringBuilder inputStreamToString(InputStream is)
        throws IOException {
    String line = "";
    StringBuilder total = new StringBuilder();

    // Wrap a BufferedReader around the InputStream
    BufferedReader rd = new BufferedReader(new InputStreamReader(is));

    // Read response until the end
    while ((line = rd.readLine()) != null) {
        Log.v("debug", "top of readlineloop");
        total.append(line);
        Log.v("debug-readline", line);
    }
    // Return full string
    return total;
}
}

Answer 1

The response entity, the one returned by getEntity(), does not include the response headers, and it looks like that’s what you’re interested in. To retrieve the status code, use:

response.getStatusLine().getStatusCode()

The “entity” is reponse content.

EDIT: to emit content from PHP, use echo, print_r(), var_dump(), numerous other functions, and – most importantly – all text outside of <?php...?> tags.