Android Open Source - android-ocw Search Courses Task

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License

The source code is released under:

GNU General Public License

Java Source Code

package app.ocw.task;
//from  w ww .  j a v a2s  .  c  o  m
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;

import android.os.AsyncTask;
import android.util.Log;
import app.ocw.api.CourseSearchAPI;
import app.ocw.model.Course;

/**
 * An async task for querying a list of courses from the OCW data search API.
 * It will only use the first string in the ellipsis array. The background
 * thread will return NULL for a failed query.
 * 
 * @author Nick Ferraro
 *
 */
public abstract class SearchCoursesTask extends AsyncTask<String, Integer, List<Course>> implements CourseSearchAPI {
  @Override
  protected final List<Course> doInBackground(String... params) {
    List<Course> courses = new ArrayList<Course>();

    if(params != null && params.length > 0) {
      String url = params[0];
      
      try {
        // Create our client, our request, and get our response
        HttpClient client = new DefaultHttpClient();
        HttpGet searchCourses = new HttpGet(url);
        HttpResponse searchCoursesResponse = client.execute(searchCourses);
        
        // Parse our response into a list of Category objects
        JSONArray coursesArray = new JSONArray(EntityUtils.toString(searchCoursesResponse.getEntity()));
        for( int i = 0; i < coursesArray.length(); ++i ) {
          JSONObject courseObject = coursesArray.getJSONObject(i);
          Course parsedCourse = new Course(courseObject.getString(KEY_ID),
              courseObject.getString(KEY_TITLE),
              courseObject.getString(KEY_DESCRIPTION),
              courseObject.getString(KEY_LANGUAGE),
              courseObject.getBoolean(KEY_IS_MEMBER),
              courseObject.getString(KEY_SOURCE),
              courseObject.getDouble(KEY_SCORE),
              courseObject.getString(KEY_LINK));
          courses.add(parsedCourse);
        }
      } catch(Exception e) {
        Log.d("SearchCoursesTask", e.getMessage());
        return null;
      }
    }
    
    return courses;
  }
}

Java Source Code List

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