A long weekend with Tizen, CreateJS and JQuery Mobile

Let’s start from the end of my weekend, this is what I’ve just finished:

And now it’s time to explain what there is behind.

What you have just seen is a PoC (Proof of Concept) for an application that I’ve in mind, it allowed me to study, test and having fun with different technologies, in this post I’d like to share what I’ve learnt in less than 24 hours.
I worked with different technologies as the post title suggest, I was really curios to see how I can create good application UI on Tizen OS and understand more about its limits (if there were of course) and performances.
At the beginning, I worked on the 2.5D animation where I had to scale, skew and rotate any images chosen by the user from the Gallery application.
When I started this part I tried immediately the CSS3 transitions, I thought: “They are new, so probably they care about performances on mobile!”, so after 3 hours to play with CSS3 transitions and trying to have a smooth animation on Tizen, I decide to move on Canvas!
CSS3 transitions are very good for web and desktop, but for mobile when you start to do many heavy animations they really suck, in this Tizen device (it has an hardware similar to Galaxy S3) that is so powerful everything has to work well and with them I can’t achieve my idea.

So I moved to Canvas, but I thought to find something that could help me during my “coding time” and that it feels me more comfortable so I remembered that I’ve used long time ago CreateJS for some test and in this case it helps me a lot.
When you work with CreateJS, more or less you are working with Actionscript with some small changes, for any Actionscript developer it should be a good start to move on Javascript, but there are many other options as Dart or Typescript for example that are good enough for any developer that is looking for something more than Javascript (my 2 cents).
But in this case CreateJS  helps me a lot because is highly focused on Canvas development so definitely what I was looking for.
I haven’t any trouble with this library on Tizen, the performance are so good as you have seen on the video and I didn’t write so much code, my Javascript file for the whole app is less than 260 lines, not a lot I guess.

After that I moved on and I start to work with Tizen web APIs to get images from the Gallery application.
In this case the Tizen developer forum and the online guide help me so much, in fact I found a working example in the forum that I had only to customise for my PoC.
The big issue that I found here is if I want to select more than one image, working with Gallery instance, I couldn’t do that or maybe I couldn’t find a way to do that, so I decided to create a quick picker (at the beginning of my application) to allow me to choose more than one image to the time.
To do that I had to work with filesystem APIs instead of the Gallery one, but in a while I had done everything, this is the code to retrieve all images from Image folder of Tizen OS, but you can use to retrieve any kind of files on Tizen OS:

function onResolveError() {
    console.log("error retrieve data");
}
function onsuccess(files) {
    for (var i = 0; i < files.length; i++) {
        console.log("File name is " + files[i].name + " and URL is " + files[i].toURI()); 
    }
}
function onResolveSuccess(dir) {
    dir.listFiles(onsuccess, onResolveError);
}
function openImages() {
    tizen.filesystem.resolve('images', onResolveSuccess, onResolveError, 'w'); 
}

After that I spend few hours to skin my app and get the right look and feel I had in mind with CSS and JQuery mobile and to create this post with the video.
A quick recap of my last experience:

  • on Tizen if you need to improve performances try to work with Canvas instead of CSS transitions
  • when you have to retrieve files (images, video or whatever) remember to set the right privileges on config.xml and then add the code you can find above
  • CreateJS is a really good library if you want to work with Canvas efficiently and without wasting your time
  • CreateJS has a good community and if you have a problem you can find a lot of solutions and suggestions
  • CreateJS is familiar for any Actionscript 3 developer

That’s it!
Ah, if you are asking if I changed my “religion”? Don’t worry, soon you’ll have news about Flash Platform in this blog, but sometimes I want to experiment new things.

Review: HTML5 Mobile Web Development

A couple of weeks ago I became blogger reviewer for O’really, so I take this opportunity to open my mind and learn new stuff about new technologies, programmation languages, etc.

So this is my first review and I start with an HTML5 video course.
Why am I talking about HTML5 in this blog? Because I think it’s important to know and learn if it could be useful in some projects or not.

Starting with this idea I’ve decided to watch this video course about HTML5 on mobile development.
Video courses aren’t my favorite media to learn new stuff because I love to sign my books, add some notes…you know what I mean… but this time I was really impressed about how O’Reilly organized it.
Seems you are in a real classroom with teacher in front of you that show code examples, tips & tricks using HTML5, CSS3 on iPad or iPhone.
Course is focused on mobile development, Jake Carter, the author, shows also Android world, how to configure your computer to work with emulator and simulator for Android, iPhone and so on.

I really love the way that he works in the classroom because first of all he explains the powerful of a particular feature, then show how to implement it and finally a little part of Q&A from internet people (I suppose).
During this video course you can learn useful stuff, take a look at table of contents in O’reilly website.
It was my first time with HTML5 and I think is an interesting technology, in particular, during this course I learn how to work with geolocation,  with JS and Canvas, with audio and video API and again how to save data directly on the device in a database.
I appreciate a lot al meta and css dedicated to iPhone and iPad, very useful.
Finally if you are interesting to learn a new way to develop on mobile, I suggest to take a look at this reference.
It’s useful, easy and I think is a fast method to learn.