Writing apps for Firefox OS phones
Life on Planet Firefox
Cooking up an app for the Firefox OS is in no way difficult. All you need is a good measure of HTML and a dash of CSS. A few drops of JavaScript will bring it all to life.
Although the smartphone software market seems polarized between iOS and Android these days, other contenders are filling out or creating their own niches. Mozilla, for example is aiming at the modest part of the market share: the very low end phones. That doesn't mean that Firefox OS phones are bad. Quite the contrary. The few models I've seen so far are perfectly adequate considering their price tag. Additionally, they are real smartphones, with a great potential market in developing countries or for those who think that spending more than 100 bucks on a phone is a waste, which, let's face it, is most people.
Firefox OS can do most, if not all, of what you can do in Android and iOS, and it's easy to make apps for it. If you can write HTML5, CSS3, and JavaScript to create web apps, you've already mastered 90% of what you need to know. Even if you are bit rusty with your web technologies, I'll try to show you in this article how to get from idea to marketplace quickly and easily.
The Hardware
Having a real device on which to test your software definitely helps. The good news is that Firefox OS handsets are cheap, and you can pick up a ZTE Open for less than US$ 80 (or as little as EUR 39 if you live in Spain). Even if you don't have a physical device, however, you can run, test, and debug your app using the Firefox OS Simulator.
The Simulator
The Firefox OS Simulator is a Mozilla add-on that lets you run a Firefox OS emulator (Figure 1) and test your apps [1]. After installing it, go to the Tools | Web Developer | Firefox OS Simulator.
The simulator comprises two parts: the dashboard and the emulator proper. From the dashboard, from left to right and top to bottom, you can run the emulator, see a list of apps you have installed in the emulator, and add a directory or an URL that contains the manifest of Firefox OS app (more about that later). On the far right, within the list of apps, you can Refresh individual apps on the emulator when you make changes and Connect Firefox's integrated web development tools to the emulator to debug your JavaScript code, HTML, or CSS.
If you have a Firefox OS handset, you can also Push your app to it. To do this, you first have to configure your phone by going to Settings on your device; then, scroll down and choose Device Information | More Information | Developer and check the Remote Debugging option. Next, connect your handset to your computer using the USB data cable, and … Presto! Your device will pop up on the dashboard.
The emulator itself, apart from simulating a handset, has two menus at the top. File allows you to Quit the emulator, and App allows you to Refresh an installed app.
Note that the Firefox OS emulator is still in a very early stage of development; hence, it's slow and resource hungry. It may also behave weirdly, lock up, or show results that are inconsistent with what you would see on a real phone, which can be annoying and sort of defeats the purpose of an emulator in the first place. However, unless you have a real Firefox OS device, it's the best you can do.
The Assets
Before you start writing your app, you will want to grab the assets that Mozilla has to offer [2] and that you can use freely in your project. Not only will this make your life easier, it will also help maintain a consistent look and feel across all apps on the system.
The bag of goodies you really want to get is the Building blocks package, which includes all the fonts, icons, images, and CSS files (including styles for buttons, the status bar, etc.) that you need to design an app. Additionally, it includes plenty of examples to help you see how these resources are used, as well as sample JavaScript code to power the whole lot. For comprehensive advice and even more examples to help you use the assets, check out the Building Firefox OS website [3].
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters
Support Our Work
Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.
News
-
Juno Computers Launches Another Linux Laptop
If you're looking for a powerhouse laptop that runs Ubuntu, the Juno Computers Neptune 17 v6 should be on your radar.
-
ZorinOS 17.1 Released, Includes Improved Windows App Support
If you need or desire to run Windows applications on Linux, there's one distribution intent on making that easier for you and its new release further improves that feature.
-
Linux Market Share Surpasses 4% for the First Time
Look out Windows and macOS, Linux is on the rise and has even topped ChromeOS to become the fourth most widely used OS around the globe.
-
KDE’s Plasma 6 Officially Available
KDE’s Plasma 6.0 "Megarelease" has happened, and it's brimming with new features, polish, and performance.
-
Latest Version of Tails Unleashed
Tails 6.0 is based on Debian 12 and includes GNOME 43.
-
KDE Announces New Slimbook V with Plenty of Power and KDE’s Plasma 6
If you're a fan of KDE Plasma, you'll be thrilled to hear they've announced a new Slimbook with an AMD CPU and the latest version of KDE Plasma desktop.
-
Monthly Sponsorship Includes Early Access to elementary OS 8
If you want to get a glimpse of what's in the pipeline for elementary OS 8, just set up a monthly sponsorship to help fund its continued existence.
-
DebConf24 to be Held in South Korea
Busan will be the location of the latest DebConf running July 28 through August 4
-
Fedora Unleashes Atomic Desktops
Fedora has combined its solid distribution with rpm-ostree system to make it possible to deliver a new family of Fedora spins, called Fedora Atomic Desktops.
-
Bootloader Vulnerability Affects Nearly All Linux Distributions
The developers of shim have released a version to fix numerous security flaws, including one that could enable remote control execution of malicious code under certain circumstances.