Android Open Source - FoodFinderApp Async Send Request

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Back to project page FoodFinderApp.

License

The source code is released under:

GNU General Public License

Java Source Code

package cs499.examples.semesterproject;
/*w  w  w. j a  va  2  s. co m*/
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.List;

import org.apache.http.NameValuePair;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.Toast;

public class AsyncSendRequest extends AsyncTask <String, String, String> 
{
  List<NameValuePair> requests;
  String url;
  Activity context;
  ProgressDialog progressDialog;
  boolean successful = false;
  
  public AsyncSendRequest (List<NameValuePair> requests, String url, Activity context)
  {
    this.requests = requests;
    this.url = url;
    this.context = context;
  }
  
  protected void onPreExecute() 
  {
    // TODO Auto-generated method stub
    progressDialog = new ProgressDialog(context);
      progressDialog.setMessage("Sending request to restaurant");
        progressDialog.show();  
    }
  
  @Override
  protected String doInBackground(String... arg0) 
  {
    // TODO Auto-generated method stub
    return this.postRestaurantInfo(this.url);
  }

  @SuppressWarnings("finally")
  public String postRestaurantInfo(String url)  // url is your json url
  {
    String s = null;
    HttpURLConnection conn = null;
    Log.d("Post", "In send request's post method now");
    try
    {
      Log.d("", "AsyncTask NameValuePairs");
      for (NameValuePair p: this.requests)
      {
        
        Log.d(p.getName(), p.getValue());
      }
      System.setProperty("http.keepAlive", "false");
      URL newUrl = new URL(this.url);
      Log.d("tag:", "Connecting to URL....");
      conn = (HttpURLConnection) newUrl.openConnection();
      conn.setReadTimeout(10000);
      conn.setConnectTimeout(15000);
      conn.setRequestMethod("POST");
      conn.setUseCaches(false);
      conn.setDoInput(true);
      conn.setDoOutput(true);
      
      Log.d("post: ", "Before post....");
      OutputStream os = conn.getOutputStream();
      BufferedWriter writer = new BufferedWriter(
              new OutputStreamWriter(os, "UTF-8"));
      writer.write(getQuery(this.requests));
      writer.flush();
      writer.close();
      os.close();
  
      conn.connect();
      int responseCode = conn.getResponseCode();
      Log.d("tag: ", "After posting....");
      Log.d("Http response: ", "" + responseCode); 
      
      InputStream is = conn.getInputStream();
      BufferedReader br = new BufferedReader(new InputStreamReader(is));
          StringBuilder sb = new StringBuilder();
          int value=0;
          int count = 0;
           
           // reads to the end of the stream 
          value = br.read();
           while( value != -1)
           {
              // converts int to character
              char c = (char)value;
              sb.append(c);
              count++;
              //System.out.println(c);
              value = br.read();
           }
           is.close();
          s = sb.toString();
          Log.d("tag: ", "Characters read: "+count+", Length of S: "+s.length() + "S itself: " + s);
      
    }
    catch (Exception e)
    {
      Log.e("Http Exception", "", e);
    }
    
    finally
    {
      conn.disconnect();
    }
    successful = true;
    return s;
  }
  
   private String getQuery(List<NameValuePair> params) throws UnsupportedEncodingException
     {
         StringBuilder result = new StringBuilder();
         boolean first = true;

         for (NameValuePair pair : params)
         {
             if (first)
                 first = false;
             else
                 result.append("&");

             result.append(URLEncoder.encode(pair.getName(), "UTF-8"));
             result.append("=");
             result.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
         }

         return result.toString();
     }

  @Override
  protected void onPostExecute(String result)
  {
    // TODO Auto-generated method stub
    if (this.progressDialog.isShowing())
      this.progressDialog.dismiss();
    if (successful)
      Toast.makeText(this.context, "Request was successfully submitted.", Toast.LENGTH_LONG).show();
  }

  
}

Java Source Code List

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