Posts Tagged ‘mobile application’

HTML5 knows where you are!

May 12, 2011

A few years back I was deemed a heretic by many of my colleagues and friends  when I suggested that HTML5 will remove the need for writing many mobile applications. I was pummelled with questions like:

  • But how will they work offline?
  • Are you saying a browser user experience can rival a platform native one like Apples?
  • You do realise that most games require “threading” how you going to do that?
  • What about storing data locally, can you do that?

I was able to fend of most of these, but the one I couldn’t at the time was about accessing the device applications like Camera and GPS. Well things have moved on and whilst I am no longer deemed a heretic there are still some corridor’s whispering doubt.

One of the big features of mobile technology used by many apps is the phones location and location based services and application have already been through a huge hype cycle.

Under the catch-all banner of HTML5, although it is a separate subspec, the W3C Geo Location working group are making location based applications a reality for web developers. It has been around a while and hence is fairly mature and stable now.

A device (even a desktop) can provide location information in a number of ways:

  • IP Address (this is typically the location of the ISP rather than your machine, but ok if you simply want to check which country the user is in)
  • Cell Phone triangulation (only fairly accurate, very dependent on the phone signal so could be problematic in the countryside or inside buildings)
  • GPS (very accurate, takes longer to get location, dependant on hardware support and can be unreliable inside buildings)

Location data can also be simply user defined: however this is dependent on the user entering accurate information.

Of course one of the key concerns will be privacy but the spec covers this with an approach that the requires a user to give permission for location information to be passed to an application. Note the application can only access location information through the browser and not directly e.g. from the GPS device. Hence the browser enforces the user permissions for access.

The Geo Location API allow for both one off request to get the users current location or for repeated updates on the user’s position, developers write simple callback routines for both approaches. The key information provided includes: latitude, longitude and accuracy. Accuracy is a %value of how close the longitude and latitude values are to the user. Depending on the device you may also get additional information such and speed, heading (direction of travel) and altitude.

As per any quality application you process errors accordingly, especially responding to a failure to get hold of location data because of signal issues or other reasons. Hence retrieving location information is fairly simple, the real hardwork is in processing that information and that requires good old fashioned quality programming ;o)

This specification presents a huge opportunity for web developers to create applications once deemed only the domain of platform specific code, and I for one am very excited !

http://dev.w3.org/geo/api/spec-source.html

Mobile Wars 1: Cross Platform Mobile

February 18, 2010

The world has gone mobile. Workers are logging-on to the corporate network through handheld devices and finalising business deals on the move. Everything – in short – is changing very quickly, but not as quickly as it could be.

 The explanation for such lethargy is a lack of standards. So, your firm has a great idea for a new business application? Great, but which platform do you want the application to run on?

 That probably sounds like a question of mixed priorities – surely it would be better to design the application first and then think about the operating system (or systems) you want to use? After all, business priorities – and user preferences – change as quickly as technology develops.

 Unfortunately, a lack of mobile development standards mean you will probably have to start your design with a decision on the operating system. If you want a mobile application, you have to write the code in different technologies for different operating systems on separate devices, such as for the Apple iPhone, RIM’s BlackBerry, Java/Symbian and Windows-powered phones.

 In short, developers are expected to design once and write many, many times – a method of mobile development that is simply not viable. More to the point, the plethora of mobile standards is actually crazy.

 Only a fool would want to keep working on the same piece of software over and over again. Writing multiple versions of the same app is timely, costly and wasteful. It prevents business from moving on to the next idea; it prevents firms from being innovative.

 What your business needs is a method for development that creates standardisation and allows IT professionals to write an application once and then publish it many times for different operating systems. So, where is that alternative?

 Step forwards Rhomobile, an open-source Ruby-based mobile development framework for business software. Instead of relying on proprietary languages, Rhomobile’s Rhodes framework makes use of HTML. It take a Model driven Approach to development: write once in HTML and publish many times to individual platform standards.

 The result is portability and the encouragement of development across multiple mobile operating systems, from Google Android to Symbian. It is an approach that must be encouraged.

Writing once and publishing many times will help businesses to drive down costs and release applications at greater speed. The result will be quicker innovation that provides real business benefits for end-users.

 If you think the pace of change is fast now, wait until we’ve sorted out the mobile development standards.


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