Android Open Source - spots Fetch Groups Async Task

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License

The source code is released under:

MIT License

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Java Source Code

package com.dcc.matc89.spots.network;
//  ww  w  . j  a v  a2  s  .co m
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.InvalidParameterException;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;

import android.os.AsyncTask;

import com.dcc.matc89.spots.model.Group;
import com.dcc.matc89.spots.model.Spot;
import com.dcc.matc89.spots.network.FetchGroups.OnGroupsReceiver;
import com.dcc.matc89.spots.network.FetchSpots.OnSpotsReceiver;

class FetchGroupsAsyncTask extends AsyncTask<String, Void, List<Group>> {

  private static final String URL = "http://matc89spots.appspot.com/api/groups";

  private OnGroupsReceiver mReceiver;
  private List<Group> mGroups;


  public FetchGroupsAsyncTask(OnGroupsReceiver receiver) {
    mReceiver = receiver;
  }

  @Override
  protected List<Group> doInBackground(String... params) {
    if(params != null && params.length % 2 == 1)
      throw new InvalidParameterException("Parameters should be in pairs. Key and value.");
    mGroups = new ArrayList<Group>();
    try {
      URL url = new URL(Utils.getUrl(URL, params));
      HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
      InputStream inputStream = urlConnection.getInputStream();
      try {
        String data = Utils.convertInputStreamToString(inputStream);
        JSONArray groups = new JSONArray(data);
        for(int i = 0; i < groups.length(); i++)
          mGroups.add(Group.createFromJSONObject(groups.getJSONObject(i)));
      } finally {
        if(inputStream != null)
          inputStream.close();
        urlConnection.disconnect();
      }
      return mGroups;
    } catch (Exception e) {
      e.printStackTrace();
    } 
    return mGroups;
  }

  @Override
  protected void onPostExecute(List<Group> result) {
    super.onPostExecute(result);
    mReceiver.onGroupsReceived(result);
  }


}

Java Source Code List