Android Open Source - formulize-android F User Session

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License

The source code is released under:

GNU General Public License

Java Source Code

package ca.formulize.android.connection;
/*  w w w .j a  va  2 s.  c  om*/
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Handler;
import android.os.Message;
import android.widget.Toast;
import ca.formulize.android.R;
import ca.formulize.android.data.ConnectionInfo;
import ca.formulize.android.ui.ConnectionActivity;
import ca.formulize.android.util.ConnectionUtil;

/**
 * Singleton representation of the user's login session. Other classes may
 * retrieve this to get the login information on a user. User name and password
 * of the user is stored here, even if "Remember me" is not checked by the user.
 * 
 * Note: A user's login session token is stored in the CookieManager in the
 * HttpUrlConnection Library.
 * 
 * @author timch326
 * 
 */
public class FUserSession {

  private static final int KEEP_ALIVE_INTERVAL = 10;

  private static FUserSession instance;
  private ScheduledThreadPoolExecutor keepAliveExecutor;
  private ConnectionInfo connectionInfo;

  public static FUserSession getInstance() {
    if (instance == null) {
      instance = new FUserSession();
      return instance;
    } else
      return instance;
  }

  private FUserSession() {
  }

  public ConnectionInfo getConnectionInfo() {
    return this.connectionInfo;
  }

  public void setConnectionInfo(ConnectionInfo connectionInfo) {
    this.connectionInfo = connectionInfo;
  }

  /**
   * Keeps a user session from being timed out when the application is
   * running. This should be called only after a user has logged into a
   * Formulize account, and a Connection Info is stored in this object.
   * 
   * @param context
   *            The current context of the Android application
   */
  public void startKeepAliveSession(Context context) {

    keepAliveExecutor = new ScheduledThreadPoolExecutor(1);
    keepAliveExecutor.scheduleAtFixedRate(new LoginRunnable(connectionInfo,
        new KeepAliveHandler(context)), 0, KEEP_ALIVE_INTERVAL,
        TimeUnit.MINUTES);
  }

  /**
   * Stops the application from keeping the user session alive. Should be
   * called when a user logs out, or when the application is suspended.
   * 
   * @param context
   *            The current context of the Android application
   */
  public void endKeepAliveSession(Context context) {
    keepAliveExecutor.shutdown();

    ComponentName receiver = new ComponentName(context,
        NetworkStateReceiver.class);
    PackageManager pm = context.getPackageManager();
    pm.setComponentEnabledSetting(receiver,
        PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
        PackageManager.DONT_KILL_APP);
  }

  /**
   * Formulize login handler that is used for keeping a user session from
   * timing out. It handles lost network connection by waiting for the
   * connection to be re-established, other errors will be handled by
   * returning to {@link ConnectionActivity}.
   * 
   * @author timch326
   * 
   */
  private static class KeepAliveHandler extends Handler {

    private final Context context;

    public KeepAliveHandler(Context context) {
      super();
      this.context = context;
    }

    public void handleMessage(Message msg) {

      int result = msg.getData().getInt(
          LoginRunnable.EXTRA_LOGIN_RESPONSE_MSG);

      switch (result) {
      case LoginRunnable.LOGIN_SUCESSFUL_MSG:
        break;
      default:
        // Keep alive failed, return to connection list

        Toast connectionToast;

        if (!ConnectionUtil.isOnline(context)) {

          // Enable NetworkStateReceiver to listen for network changes
          ComponentName receiver = new ComponentName(context,
              NetworkStateReceiver.class);
          PackageManager pm = context.getPackageManager();
          pm.setComponentEnabledSetting(receiver,
              PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
              PackageManager.DONT_KILL_APP);

          connectionToast = Toast.makeText(context,
              R.string.toast_no_network_connection,
              Toast.LENGTH_SHORT);
        } else {
          // Error with the Formulize Connection, return to
          // ConnectionActivity
          connectionToast = Toast.makeText(context,
              R.string.toast_connection_failed,
              Toast.LENGTH_SHORT);

          Intent connectionIntent = new Intent(context,
              ConnectionActivity.class);
          context.startActivity(connectionIntent);
        }

        connectionToast.show();
      }
    }
  };
}

Java Source Code List

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