To prepare for a talk on widgets, my learning process started with:
Good question. Their easy. No tools required. No runtime. Easy to deploy from the Windows Marketplace for Mobile. And just enough support inside IE Mobile to make things interesting. Other nice features include: supports localization, persistence, secure, extensible, etc. Also, Microsoft is following the W3C widgets effort.
How to make a widget?
First, this is not a typical widget. As a matter of fact, this one doesn’t have a lot of value. But it should give you an idea of some fundamentals. For me personally, I want to find out more about the widget object and the SystemState events, but that’s another day – like when we document better.
The structure of a widget is straightforward. You need a a HTML file, and a icon of some sort (the type does matter, based on targeted O/S), and a config file. Even though you can use any text editing tool (like Notepad or Expression Web), I’m using Visual Studio (web project / file system). Here’s my Solution Explorer:
Widgets require a manifest, and that is what config.xml is. There are additional fields that should be included, but here’s the bare minimum. Basically, this provides enough information to get the widget installed, and the starting HTML page.
<?xml version="1.0" encoding="utf-8" ?>
<widget version="1.0" xmlns="http://www.w3.org/ns/widgets" id="">
<content src="JonWidget.htm" type="text/html" />
<description>This is an extremely cheap widget</description>
<title>Jon's First Widget</title>
The developer will leverage “sideload deployment”, but the regular end-user will download from the new online store.
To get this installed via sideload deployment, there are several steps:
Here is the installer prompting me. Note the data from the config file being used: widget name, description, and icon.
Here is the widget running.
Also note that the widget shows up in the list of applications. To remove, the user has to go to “Remove Programs”.
So, take a deeper look at this technology. With Windows Mobile 6.5 launch approaching, this is a good time to consider getting in the early wave. More details on a better app coming in the future. Hope to see you in the Windows Marketplace for Mobile. And if you like a nice little reward for your widget efforts, check out http://www.mobilethisdeveloper.com.