Download as PDF, PPTX
Uploaded byTor Björn Minde
Web background service on labs
The document describes the Web Background Service, a Java application that allows web applications to execute logic in the background on Android and Java Standard Edition platforms. It enables features such as network communication through APIs, user notifications, and interaction between main and background application code. An example is provided with a banana counting script that updates a web page and alerts users when the web app is closed.
More Related Content
Similar to Web background service on labs
Web background service on labs
- 1. Web Background Service Alabs.ericsson.com enabler https://labs.ericsson.com/apis/web-background-service/
- 2. Web Background service A stand-alone Java application that runs on Android as well as on platforms supporting Java Standard Edition Enables web applications, running in the browser, to run part of the application logic in the background The JavaScript code running in the background will continue to run when the associated web application running in the browser is closed 2
- 3. Web Background features The background JavaScript code can use APIs such as XMLHttpRequest to communicate over the network and Web Notifications to get the user's attention Remote Procedure Call (RPC) bridge allows for simple interaction between the main application and the background code Management Console lets the user manage currently running background applications 3
- 4. Web Background example Simple banana counting script running in the Web Background service The background script updates the web page with the current banana count using RPC When the web application running in the browser is closed, notifications are used to alert the user 4
- 5. Web Background example Web application running in the browser <html> <head> <title>Simple Web Background application</title> <script src="wb.js"></script> <!– bootstrap script --> <script> wb.onload = function () { wb.enable("icon.png", document.title, "Here's the description", "persistent.js"); }; function log(msg) { document.body.innerHTML += msg + "<br>"; } </script> </head> <body> </body> </html> 5
- 6. Web Background example persistent.js (running in the WB service) var count = 0; var notification; wb.client.importFunctions("log"); wb.client.onconnect = function () { setInterval(function() { var msg = "number of bananas: " + count++; if (wb.client.connected) wb.client.log(msg); else { if (notification) notification.cancel(); notification = notifications.createNotification("icon.png", ”Banana count", msg); notification.show(); } }, 3000); }; 6
- 7.