Android Open Source - FoodFinderApp Async Search Items

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Back to project page FoodFinderApp.
License

The source code is released under:
GNU General Public License
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Java Source Code

package cs499.examples.semesterproject;
//w w w .  j  a  v a  2 s. c  om
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class AsyncSearchItems extends AsyncTask <String, String, JSONArray>
{
  String [] items;
  ArrayList<String> selectedItems = new ArrayList<String>();
  DisplayPlaceItems ac;
  ListView lv;
  List<NameValuePair> pairs;
  String url;
  ProgressDialog progressDialog;
  
  private String s;
  private List<NameValuePair> requests;
  
  
  public AsyncSearchItems(DisplayPlaceItems ac, String url, List<NameValuePair> pairs,
      ListView lv) 
  {
    this.ac = ac;
      this.url = url;
      this.lv = lv;
      this.pairs = pairs;    
  }

   
  protected void onPreExecute() 
  {
    // TODO Auto-generated method stub
    progressDialog = new ProgressDialog(ac);
      progressDialog.setMessage("Fetching items from food place...");
        progressDialog.show();  
    }
  

   
  protected JSONArray doInBackground(String... params) {
    // TODO Auto-generated method stub
    for (int i = 0; i < pairs.size(); i++)
    {
      Log.d(pairs.get(i).getName() + ": ", pairs.get(i).getValue());
    }
      return this.getJSONFromUrl(this.url);
  }

   
  public JSONArray getJSONFromUrl(String url) {
    // Making HTTP request
        InputStream is = null; 
        String json = null;
        JSONArray jObj = null;
          try {
              // defaultHttpClient
              DefaultHttpClient httpClient = new DefaultHttpClient();
              HttpPost post = new HttpPost(url);
              post.setEntity(new UrlEncodedFormEntity(pairs));
              HttpResponse httpResponse = httpClient.execute(post);
              HttpEntity httpEntity = httpResponse.getEntity();
              is = httpEntity.getContent();           

          } catch (UnsupportedEncodingException e) {
              e.printStackTrace();
          } catch (ClientProtocolException e) {
              e.printStackTrace();
          } catch (IOException e) {
              e.printStackTrace();
          }

          try {
              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();
              String s = sb.toString();
              System.out.println("Characters read: "+count+", Length of S: "+s.length());
              json = s;
              System.out.println("getJSONfromURL: "+ json);
          } catch (Exception e) {
              Log.e("Buffer Error", "Error converting result " + e.toString());
          }
          

          // try parse the string to a JSON object
          try {
              jObj = new JSONArray(json);
          } catch (JSONException e) {
              Log.e("JSON Parser", "Error parsing data " + e.toString());
          }

          // return JSON String
          return jObj;
  }

  public void showQueryResults(JSONArray j) 
  {
    // TODO Auto-generated method stub
    ArrayList<HashMap<String, String>> itemsList = new ArrayList<HashMap<String,String>>();
    
    try
    {
      JSONArray docs = j;
      Log.d("Length of JSON Array: ", "" + docs.length());
      if (docs.length() > 0)
      {
        for (int i = 0; i < docs.length(); i++)
        {
                  JSONObject c = (JSONObject)docs.getJSONObject(i);
                  
                  String foodplacename = c.getString("foodplacename");
                  String itemName = c.getString("itemname");
                  String itemAmount = String.valueOf(c.getInt("itemtype"));
                  String itemId = String.valueOf(c.getInt("itemid"));
                  
                  HashMap<String, String> map = new HashMap<String, String>();
  
                  map.put("foodplacename", foodplacename);
                  map.put("itemName", itemName);
                  map.put("itemAmount", itemAmount);
                  map.put("itemId", itemId);
                  
                  itemsList.add(map);
                  Log.d("Display Item: ", itemId + " " + foodplacename 
                      + " " + itemName + " " + itemAmount + " ");
        }
      }
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
    
    items = new String[itemsList.size()];
    int i = 0;
    for (HashMap<String,String> map: itemsList)
    {
      String a = "Item:" + (String)map.get("itemName")
          + ", Quantity:" + (String)map.get("itemAmount");
      items[i++] = a;
    }
    final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this.ac,android.R.layout.simple_list_item_1, items);
    lv.setAdapter(adapter);
    lv.setClickable(true);
    
  }


   
  protected void onPostExecute(JSONArray jobj) 
  {
    // TODO Auto-generated method stub
    if (this.progressDialog.isShowing())
      this.progressDialog.dismiss();
    this.showQueryResults (jobj);
    this.ac.notifyDataReceived();
  }
  
  
  
  

}
Java Source Code List
