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Navigate parent activity from notifications

My question is that I have two types of activity: activity A and activity B. Activity A is the main activity, activity B is available only by touching the notification.

I need to be able to touch the notification that action B will open. After the user completes action B, they can click the back button or complete the “Activity B.” When action "B" closes, action "A" should be shown. I am currently closing Activity A (which closes the entire application) and receiving a push notification. I select the push notification that Activity B opens. When I close Activity B, Activity A does not appear and the entire application closes. I want Activity A to be after Activity B.

I am using Parse SDK notifications. In my regular ParsePushBroadcastReceiver, I have the following code

public class MyReceiver extends ParsePushBroadcastReceiver 
{
  @Override
  public void onPushOpen(Context context, Intent intent) 
  {        

    Intent i = new Intent(context, NotificationActivity.class);
    i.putExtras(intent.getExtras());
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

    context.startActivity(i);
  }
}

I pointed it in the Android manifest. My manifest notification activity

<activity
        android:name=".NotificationActivity"
        android:label="@string/app_name" 
        android:windowSoftInputMode="adjustPan"
        android:screenOrientation="portrait"
        android:parentActivityName=".MainActivity">

    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value=".MainActivity"/>

</activity>

In my notification activity, I have the following code in onBackPressed

public class NotificationActivity extends ActionBarActivity
{...
   @Override
   public void onBackPressed() 
   {
      if(NavUtils.getParentActivityName(this) != null)
      {
        Log.d(Constants.NAVIGATION_DEBUG, "Get Parent Activity NOT NULL"); 

        NavUtils.navigateUpFromSameTask(this); 
      }
      else
      {
        Log.d(Constants.NAVIGATION_DEBUG, "Get Parent Activity NULL"); 

        super.onBackPressed();
      } 
     }
...}

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public class MyReceiver extends ParsePushBroadcastReceiver 
{
  @Override
  public void onPushOpen(Context context, Intent intent) 
  {        

    Intent i = new Intent(context, MainActivity.class);
    i.putExtras(intent.getExtras());
    i.putExtra("IS_FROM_NOTIFICATION", true);
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

    context.startActivity(i);
  }
}

MainActivity's onCreate() - :

public class MainActivity extends ActionBarActivity {
...
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        if (getIntent().getBooleanExtra("IS_FROM_NOTIFICATION", false)) {
            startActivity(MainActivity.this, NotificationActivity.class);
        }
    } 
    // other initialization code
    ...
...
}

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