Porting between Symbian Web Runtime and Nokia Asha Web Apps
This article explains the differences between Symbian Web Runtime and Series 40 Web Apps, and the changes you need to make to port between the two formats.
The Symbian Web Runtime (WRT) is the official Web Runtime offering by Nokia for Symbian devices. Series 40 Web Apps are W3C compliant widgets than run on Nokia Series 40 devices.
Both types of web apps are packaged in a zip file containing much the same files. The main change in this area when porting is to use the correct file extension:
- Series 40 Web App has extension .wgt
- Symbian Web Runtime has extension .wgz
It is also necessary to change the registration file, as discussed below.
Symbian and Series 40 Web Apps use similar but different registration files:
- Symbian Web Runtime: info.plist
- Series 40 Web Apps: config.xml
It is relatively easy to rename the file and convert the needed tags. An example is given below.
If the info.plist file of a Symbian Widget is
<xmlversion="1.0"encoding="UTF8"> <DOCTYPEplistPUBLIC "//Nokia//DTDPLIST1.0//EN" "http://www.nokia.com/NOKIA_COM_1/DTDs/plist-1.0.dtd"> <plist version="1.0"><dict> <key>DisplayName</key> <string>A Widget</string> <key>Identifier</key> <string>xxx.xxx.widget</string> <key>MainHTML</key> <string>AWidget.html</string> </dict></plist>
and the config.xml of a S40 Web App must be altered as
<?xml version="1.0" encoding="UTF-8"?> <widget xmlns=" http://www.w3.org/ns/widgets" height="200" id="http://nokia.com/simplemaps" version="0.1.0" viewmodes="windowed fullscreen" width="200"> <name short="AW">A Widget</name> ... <icon src="icon.png"/> <content src="AWidget.html"/> ... </widget>
If need be, developers can add other tags such as
<description>...</description> <author email=" email@example.com" href=" http://www.website.com/"> Corporation </author> <license>...</license>
Size of UI elements
The screen size of Series 40 device is different from Symbian devices, so the application must change the width and height of some items in html or css in order to optimise the UI. This includes text, images and videos.
Media file size
Series 40 devices are typically are less powerful than Symbian devices. In order to run applications at acceptable speeds, it may be necessary to use smaller media files, including images, audio and video.