Android Open Source - FoodFinderApp Async Add Items

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License

The source code is released under:

GNU General Public License

Java Source Code

package cs499.examples.semesterproject;
//from   w  w w . ja  v a2 s.com
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 AsyncAddItems extends AsyncTask <String, String, String>
{
  Activity a;
  List<NameValuePair> pairs;
  String url;
  ProgressDialog progressDialog;
  boolean successful = false;
  
  public AsyncAddItems (Activity a, List<NameValuePair> pairs, String url)
  {
    this.a = a;
    this.pairs = pairs;
    this.url = url;
  }
  
  
  protected void onPreExecute() {
      progressDialog = new ProgressDialog(a);
      progressDialog.setMessage("Adding items to the list...");
        progressDialog.show();
    }


   @Override
      protected String doInBackground(String... params) 
      {
        return this.postRestaurantInfo(this.url);

      } 
      
    @SuppressWarnings("finally")
    public String postRestaurantInfo(String url)  // url is your json url
    {
      String s = null;
      HttpURLConnection conn = null;
      
      try
      {
        Log.d("", "AsyncTask NameValuePairs");
        for (NameValuePair p: this.pairs)
        {
          
          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.pairs));
        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;
    }
    
       protected void onPostExecute (String s)
        {
         Log.d("onPostExecute tag: ", "Before PostExecute");
         if (this.progressDialog.isShowing())
           this.progressDialog.dismiss();
         Log.d("onPostExecute tag: ", "After PostExecute");
         if (successful)
           Toast.makeText(this.a, "Item successfully added", Toast.LENGTH_LONG).show();
        }

       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();
       }

}

Java Source Code List

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