Android Open Source - formulize-android Logout Async Task

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License

The source code is released under:

GNU General Public License

Java Source Code

package ca.formulize.android.connection;
//ww w . ja v  a 2  s .  co m
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import ca.formulize.android.R;
import ca.formulize.android.data.ConnectionInfo;
import ca.formulize.android.ui.ConnectionActivity;
import ca.formulize.android.util.ConnectionUtil;

/**
 * This AsyncTask logs the user out of their Formulize account if they are
 * currently logged in. It is assumed that when a logout is successful, two
 * cookies: "autologin_uname" and "autologin_pass", would be in the Set-Cookie
 * header in the response.
 * 
 * A successful or failed logout is currently handled the same way - the
 * application returns to the Connection List.
 * 
 * @author timch326
 * 
 */
public class LogoutAsyncTask extends
    AsyncTask<ConnectionInfo, Integer, Integer> {

  // Messages that could be sent by the logout routine
  public int LOGOUT_SUCCESSFUL_MSG = 0;
  public int LOGOUT_FAILED_MSG = -1;

  private ProgressDialog progressDialog;
  private FragmentActivity activity; // Application context
  private ConnectionInfo connectionInfo; // Login Info

  public LogoutAsyncTask(FragmentActivity activity) {
    this.activity = activity;
    progressDialog = new ProgressDialog(activity);
  }

  protected void onPreExecute() {
    this.progressDialog.setMessage(activity.getString(R.string.progress_logout));
    progressDialog.show();
  }

  @Override
  protected Integer doInBackground(ConnectionInfo... info) {

    HttpURLConnection urlConnection = null;
    int response = LOGOUT_FAILED_MSG;
    int responseCode = 0;
    connectionInfo = info[0];

    try {
      // Create connection to server and set request parameters
      urlConnection = (HttpURLConnection) new URL(
          connectionInfo.getConnectionURL() + "user.php"
              + "?op=logout").openConnection();
      urlConnection.setReadTimeout(10000);
      urlConnection.setConnectTimeout(15000);
      urlConnection.setInstanceFollowRedirects(false);

      Log.d("Formulize", connectionInfo.getConnectionURL());

      // Check Http Status Code
      urlConnection.connect();
      responseCode = urlConnection.getResponseCode();

      // Get the list of cookies received
      List<String> cookies = urlConnection.getHeaderFields().get(
          "Set-Cookie");
      Log.d("Formulize", "Cookies:" + cookies.toString());

      // If there are 2 or more cookies received, login was successful
      if (cookies.size() >= 2) {
        response = LOGOUT_SUCCESSFUL_MSG;
      } else {
        response = LOGOUT_FAILED_MSG;
      }

    } catch (MalformedURLException e) {
      e.printStackTrace();
      return LOGOUT_FAILED_MSG;
    } catch (IOException e) {

      // Print Error Response if response code is not 200
      if (responseCode != 200 && responseCode != 0) {
        InputStreamReader in = new InputStreamReader(
            urlConnection.getErrorStream());
        ConnectionUtil.readInputToString(in);

      }
      e.printStackTrace();
      return LOGOUT_FAILED_MSG;
    }

    return response;
  }

  protected void onPostExecute(Integer result) {
    if (progressDialog.isShowing()) {
      progressDialog.dismiss();
      progressDialog = null;
    }
    super.onPostExecute(result);
    
    FUserSession.getInstance().endKeepAliveSession(activity);
    Intent connectionIntent = new Intent(activity, ConnectionActivity.class);
    activity.startActivity(connectionIntent);
  }

}

Java Source Code List

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