Android Open Source - MotorIndia Retrivearticle

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License

The source code is released under:

GNU General Public License

Java Source Code

package spider.motorindia;
/*from www.j a v a2  s .co  m*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;



import android.os.AsyncTask;

public class Retrivearticle extends AsyncTask<String, Void, JSONObject> {

  // variable used to send the data back
  private MyCallbackInterface mCallback;
  public Retrivearticle(MyCallbackInterface callback) {
    // this is the constructor for this class
    mCallback = callback;
  }

  @Override
  protected JSONObject doInBackground(String... arg0) {
    
    // this is where the actual asynchronous "work" happens
    
    // the first and only string is the url - i hope
    String url = arg0[0];
    
    // make this client, httpget and response, we will use them later
    HttpClient client = new DefaultHttpClient();
    HttpGet httpGet = new HttpGet(url);
    HttpResponse response;
    // and the result where we will have the JSON as a string
    String result = null;
    
    //use the client to send the get request store the response in duh response
    try {
      response = client.execute(httpGet);
      HttpEntity entity = response.getEntity();
      if (entity != null) {
        // A Simple JSON Response Read
        InputStream instream = entity.getContent();
        result = convertStreamToString(instream);
        // now you have the string representation of the HTML request in result so,
        JSONObject myObject;
        try {
          myObject = new JSONObject(result);
          return myObject;
        } catch (JSONException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
      }
    } catch (ClientProtocolException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    // If all fails then
    return null;
  }
  
  private static String convertStreamToString(InputStream is) {
    
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    
    StringBuilder sb = new StringBuilder();

    String line = null;
    try {
      while ((line = reader.readLine()) != null) {
        sb.append(line + "\n");
      }
      } catch (IOException e) {
        e.printStackTrace();
      } finally {
        try {
          is.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
      return sb.toString();
  }
  
  // I define the callback interface for sending data back when we get it.
  public interface MyCallbackInterface {
    //its supposed to send the JSON object on request completed
    public void onRequestCompleted(JSONObject result);
  }
  
  @Override
  protected void onPostExecute(JSONObject result) {
    //So that i have the JSON ready to use, i use the call back to send it to the 'displayactivity.java' ;)
    mCallback.onRequestCompleted(result);
  }
}

Java Source Code List

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