Android: How can I start an activity from a regular java class? the java class is servlet

How can I start an activity from a servlet? I have an i-Jetty server installed and a servlet that responds to HTTP request. I would like to start an activity from the servlet, does any body have any idea on how to 开发者_开发知识库do this?

You'll have to do it the other way: have an Android Service that will periodically query that servlet and decide whether to launch an Activity (or rather show a notification). AlarmManager might also come handy for this.