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BOOK: Professional Android Application Development ISBN: 978-0-470-34471-2
This is the forum to discuss the Wrox book Professional Android Application Development by Reto Meier; ISBN: 9780470344712
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Old February 22nd, 2010, 12:05 PM
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Default Chp Earthquakes

Hello,

I'm enjoying the book, but I'm puzzled by a couple of the methods in the Earthquake class from Ch 6:

Code:
private void addNewQuake(Quake _quake) {
	  ContentResolver cr = getContentResolver();
	  
	  // Construct a where clause to make sure we don’t already have this 
	  // earthquake in the provider.
	  String w = EarthquakeProvider.KEY_DATE + " = " + _quake.getDate().getTime();

	  // If the earthquake is new, insert it into the provider.
	  if (cr.query(EarthquakeProvider.CONTENT_URI, null, w, null, null).getCount() == 0){
I note that in the book, this is getCount>0, I'm glad to see it has been corrected in the downloaded code!
Code:
	    ContentValues values = new ContentValues();    

	    values.put(EarthquakeProvider.KEY_DATE, _quake.getDate().getTime());
	    values.put(EarthquakeProvider.KEY_DETAILS, _quake.getDetails());

	    double lat = _quake.getLocation().getLatitude();
	    double lng = _quake.getLocation().getLongitude();
	    values.put(EarthquakeProvider.KEY_LOCATION_LAT, lat);
	    values.put(EarthquakeProvider.KEY_LOCATION_LNG, lng);
	    values.put(EarthquakeProvider.KEY_LINK, _quake.getLink());
	    values.put(EarthquakeProvider.KEY_MAGNITUDE, _quake.getMagnitude());

	    cr.insert(EarthquakeProvider.CONTENT_URI, values);
	    earthquakes.add(_quake);
addQuakeToArray also calls earthquakes.add(), doesn't it therefore get added twice?
Code:
	    addQuakeToArray(_quake);
	  }
	}

  /** Add a new quake to the ArrayList */
	private void addQuakeToArray(Quake _quake) {
	  if (_quake.getMagnitude() > minimumMagnitude) {
	    // Add the new quake to our list of earthquakes.
	    earthquakes.add(_quake);

	    // Notify the array adapter of a change.
	    aa.notifyDataSetChanged();
	  }
	}
Thanks
Ian
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